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Academic literature on the topic 'Tetragonal to monoclinic transformation'

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Published: 11 March 2023

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Journal articles on the topic "Tetragonal to monoclinic transformation"

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Kelly, P. M., and C. J. Wauchope. "The Tetragonal to Monoclinic Martensitic Transformation in Zirconia." Key Engineering Materials 153-154 (February 1998): 97–124. http://dx.doi.org/10.4028/www.scientific.net/kem.153-154.97.

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KUDO, Haruhiko, Hiroyuki MIURA, and Yu HARIYA. "Tetragonal-monoclinic transformation of cryptomelane at high temperature." Mineralogical Journal 15, no. 2 (1990): 50–63. http://dx.doi.org/10.2465/minerj.15.50.

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Hugo, G. R., and Barry C. Muddle. "The Tetragonal to Monoclinic Transformation in Ceria-Zirconia." Materials Science Forum 56-58 (January 1991): 357–62. http://dx.doi.org/10.4028/www.scientific.net/msf.56-58.357.

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Simha, N. K. "Crystallography of the Tetragonal → Monoclinic Transformation in Zirconia." Journal de Physique IV 05, no. C8 (December 1995): C8–1121—C8–1126. http://dx.doi.org/10.1051/jp4/1995581121.

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Sun, Jing, Chuan Zhen Huang, and Jun Wang. "Effect of TiN Addition on the Low Temperature Degradation of Ceramic Tool Materials 3Y-TZP." Key Engineering Materials 315-316 (July 2006): 40–44. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.40.

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Ceramic tool materials, 3Y-TZP added by TiN particles, were fabricated through hot-pressing techniques. The effects of TiN on their low-temperature degradation at 220# in air were investigated. It is shown that TiN can improve the stability of t-ZrO2 and inhibit the transformation from tetragonal to monoclinic phase, and that the content of TiN affects the stability of tetragonal phase and the propagation of tetragonal-to-monoclinic transformation into the specimen interiors. It is suggested that the grain-boundary phase prevents the nucleation of transformation, and that the high elastic modulus of TiN can prevent the propagation of phase transformation by resisting the volume expansion of transformation. When the content of TiN is 20wt%, the ceramic material shows better low temperature degradation resistance.
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Chu, Peir-Yung, Isabelle Campion, and Relva C. Buchanan. "Phase transformation and preferred orientation in carboxylate derived ZrO2 thin films on silicon substates." Journal of Materials Research 7, no. 11 (November 1992): 3065–71. http://dx.doi.org/10.1557/jmr.1992.3065.

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Phase transformation and preferred orientation in ZrO2 thin films, deposited on Si(111) and Si(100) substrates, and prepared by heat treatment from carboxylate solution precursors were investigated. The deposited films were amorphous below 450 °C, transforming gradually to the tetragonal and monoclinic phases on heating. The monoclinic phase developed from the tetragonal phase displacively, and exhibited a strong (111) preferred orientation at temperature as low as 550 °C. The degree of preferred orientation and the tetragonal-to-monoclinic phase transformation were controlled by heating rate, soak temperature, and time. Interfacial diffusion into the film from the Si substrate was negligible at 700 °C and became significant only at 900 °C, but for films thicker than 0.5 μm, overall preferred orientation exceeded 90%.
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Nono, Maria do Carmo de Andrade. "Tetragonal-to-Monoclinic Transformation Influence on the Mechanical Properties of CeO2- ZrO2 Ceramics." Materials Science Forum 498-499 (November 2005): 506–11. http://dx.doi.org/10.4028/www.scientific.net/msf.498-499.506.

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CeO2- ZrO2 ceramics are considered a candidate material for applications as structural high performance ceramics. In this work are presented and discussed the tetragonal-to-monoclinic stress-induced transformation influence on the mechanical properties in these ceramics. Sintered ceramics were fabricated from powders mixtures containing ZrO2 and 8 to 14 CeO2 % mol. SEM observations were used to study de ceramic microstructures and X-rays diffraction to identification and determination of tetragonal and monoclinic phases. It was adopted the 4-point bending tests, Vickers surface hardness and fracture toughness technique to the determination of the mechanical parameters. The results showed that the mechanical properties were strongly dependent of the CeO2 content, the microstructure and the fraction of tetragonal-to-monoclinic stress-induced transformation.
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Sato, Hideo, Seiji Ban, Masahiro Nawa, Y. Suehiro, and H. Nakanishi. "Effect of Grinding, Sandblasting and Heat Treatment on the Phase Transformation of Zirconia Surface." Key Engineering Materials 330-332 (February 2007): 1263–66. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.1263.

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This study was aimed to investigate the effect of grinding, sandblasting by alumina and SiC, and heat treatment on the phase transformation from tetragonal to monoclinic zirconia on the surface of yttria stabilized tetragonal zirconia (Y-TZP) and zirconia/alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite). The monoclinic phase content of both materials increased with the grinding and the sandblasting, while it decreased with the heat treatment. The monoclinic content sequentially increased with the sandblasting and decreased with the heat treatment to each specific value. The SiC-sandblasting produced the larger monoclinic content than alumina-sandblasting. Furthermore, the content changes of the nanocomposite were larger than Y-TZP.
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Hannink, R. H. J., G. R. Hugo, and Barry C. Muddle. "Reversal of the Tetragonal-Monoclinic Transformation in Ceria-Zirconia." Materials Science Forum 56-58 (January 1991): 371–76. http://dx.doi.org/10.4028/www.scientific.net/msf.56-58.371.

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Yashima, Masatomo, Taka-aki Kato, Masato Kakihana, Mehmet Ali Gulgun, Yohtaro Matsuo, and Masahiro Yoshimura. "Crystallization of hafnia and zirconia during the pyrolysis of acetate gels." Journal of Materials Research 12, no. 10 (October 1997): 2575–83. http://dx.doi.org/10.1557/jmr.1997.0342.

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Hafnia and zirconia gels were prepared by drying hafnyl or zirconyl acetate solutions. Hafnia and zirconia gels contain both hydroxyl group and bidentate acetates which are directly bonded to the metal ions. Thermal decomposition and crystallization behavior of the gels were investigated through XRD, FT-IR, and TEM. Hafnium-containing gels crystallized directly into stable monoclinic hafnia around 500–540 °C, while zirconium-containing gels first formed metastable tetragonal zirconia around 450 °C. The dissimilar crystallization behavior of the gels into metastable, tetragonal zirconia or into stable, monoclinic hafnia can be explained through the difference in free-energy changes of the tetragonal-to-monoclinic phase transformation.
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Dissertations / Theses on the topic "Tetragonal to monoclinic transformation"

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Vega, Marienette Morales. "RAMAN AND FLUORESCENCE SPECTROSCOPY OF BIOMEDICAL NANOMATERIALS." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10900.

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2013/2014
Stabilized zirconia exhibits unsurpassed mechanical properties and biocompatibility, making it an indispensable ceramic material for biomedical implants. One of the most problematic features of stabilized zirconia has been its low-temperature degradation(LTD), which is associated to the observed transformation of its crystalline structure from tetragonal to monoclinic phase. The presence of monoclinic phases, therefore, is the red-flag for the impending catastrophic breakdown of mechanical properties. In this work, we establish characterization protocols to extend the sensitivity limit of conventional Raman spectroscopy for determination of extremely little amounts of monoclinic phase in zirconia implant prototypes. We accomplish this in two ways. First, we employ Raman spectroscopy and multivariate statistical analysis on a series of fully-dense and partially transformed Y-TZP zironia prototypes. Incipient t-m transformation is only revealed with high resolution spectral mapping and principal component analysis. The technique reveals the presence of islands of monoclinic phase that are otherwise not visible by simple observation and fitting of individual spectra. High resolution mapping likewise allows for probing homogenieties in the sample, which is a critical component in the development of implants. The second protocol utilizes surface-enhanced Raman spectroscopy (SERS) with colloidal gold nanostars as substrate. The nanostars used have localized surface plasmon resonance (LSPR) at 690 nm. Two spectral maps, on clean and on nanostars-covered surface, were obtained exactly at the same position using confocal Raman spectroscopy. Comparison of the two maps shows that there are more monoclinic phases detected in the nanostars-covered surface possibly due to the “lightning rod” effect in the nanostar tips. We report an unprecedented attempt on SERS on solid zirconia, which provides early evidence of the effectivity of the technique even on non-porous materials. With further improvement in sensitivity, SERS is a promising technique for the early detection of monoclinic phase in zirconia-based implants.
XXVII Ciclo
1978
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Baeraky, Thoria A. "High temperature measurements of the microwave dielectric properties of ceramics." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323185.

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Polatidis, Efthymios. "Residual stress and phase characterisation on zirconium oxides using synchrotron X-ray diffraction." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-phase-characterisation-on-zirconium-oxides-using-synchrotron-xray-diffraction(b0bc325a-2a94-4323-8739-7ea9b04727f3).html.

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The present work was produced as part of the MUZIC consortium, a collaboration between a multi-university team from the UK and industrial partners working on the field of nuclear energy, fabrication of alloys and nuclear research. The aim of the project is to establish a multidiscipline mechanistic understanding of the corrosion and breakaway processes of zirconium alloys used as fuel cladding materials in the nuclear industry. A better understanding of the corrosion mechanism of zirconium alloys will not only aid the development of better performing alloys, but will also allow more accurate models to be developed to reliably predict the service life of existing alloys. This could lead to higher burn-up, increase of energy production and reduction of nuclear waste produced.This work seeks to provide a better understanding of the role of residual stresses in the oxide, which are produced during oxidation due to high Pilling-Bedworth ratio and their impact on oxide phase transformation and oxidation kinetics by employing high energy synchrotron X-ray diffraction techniques. This is achieved by observing how stresses change as oxide growth approaches and passes through transition of the corrosion kinetics, their evolution across the oxide thickness, in situ characterising stresses and phase growth early in oxidation process and how stress changes can affect corrosion properties.It was found that relatively high compressive stresses in the two oxide crystal structures are present. The stresses relax with time up to moments before transition where a possible threshold stress magnitude is reached to aid an extensive tetragonal to monoclinic phase transformation. This generalised tetragonal to monoclinic transformation is believed to produce highly stressed monoclinic crystal structure grains and cause defects in the oxide. The above observation is further supported by a decrease of the tetragonal zirconia content. This is the moment that the oxide looses its protective character and a transition of the corrosion kinetics occurs. By comparing different materials it was observed that the minimum magnitude of the tetragonal phase is lower in better performing alloys while the tetragonal content is some cases was relatively low. It is suggested that the amount of the tetragonal phase, in the oxide layer, is not as important as the rate of it transforming into monoclinic. The extent of tetragonal to monoclinic transformation, that introduces defects in the oxide, defines how protective an oxide layer is. The present work provides a contribution to the available knowledge of the importance of residual stresses in the oxide layer and metal substrate of zirconium alloys and how they can affect corrosion rates or act as a precursor to the corrosion transition.
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Agbo, Sunday A. "Phase Transitions and Associated Magnetic and Transport Properties in Selected NI-MN-GA based Heusler Alloys." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595644731616343.

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Mekideche, Abdeslam. "Effet mémoire de forme et plasticité de transformation dûs à la transition C. F. C. ↔T. F. C. D'alliages Mn Cu riches en Mn." Lyon 1, 1985. http://www.theses.fr/1985LYO19016.

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Les alliages Mn-Cu riches en Mn ( 80-100 %) trempés depuis haute température à 1’état cubique à face centrées présentent vers la température ambiante une transformation sans diffusion c. F. C. ↔ t. F. C. à caractère quasi-martensitique. Ce travail a pour objet l'étude de la plasticité de transformation et de la mémoire de forme liés à cette transition. Un appareil simple permettant la mesure de la déformation de flexion de plaquettes en fonction de la température et de la charge appliquée , a été mis au point et utilisé. Il a été montré que la plasticité de transformation comme l'effet mémoire de forme sont relativement limités en amplitude ( 0,6 % ) et qu 'ils s'accompagnent presque toujours de déformation plastique vraie. Des mesures complémentaires : diffraction X, résistivité, frottement intérieur et observation au microscope optique ont été effectuées et ont contribué à montrer qu'une partie importante de la déformation de l'effet mémoire est à attribuer à la variation des paramètres cristallins de la martensite t. F. C. Lorsqu'il y a dissymétrie entre les variantes.
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Chen, Zhe. "Relation microstructure et propriété mécanique des films de ZrO2 obtenus par MOCVD." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00637177.

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Les films de ZrO2 pur sont déposés par MOCVD (Metal-Organic Chemical Vapor Deposition) en variant de nombreux paramètres du processus. L'influence des conditions de dépôt sur l'évolution de la microstructure (morphologies, structure cristalline/phase, texture et contrainte résiduelle) a été étudiée et clarifiée. Par des analyses approfondies des résultats expérimentaux, trois mécanismes typiques de croissance de dépôt de ZrO2 ont été proposées. Les contraintes de croissance de compression sont en relation directe avec la diffusion atomique et la quantité d'espèces piégées dans les films. La formation de la texture cristallographique est complexe et deux types de textures ont été analysées dans la phase tétragonale : la texture de fibre {1 1 0}t est contribuée par l'effet superplastique des nano-cristallites de ZrO2 et par la contrainte de croissance de compression ; tandis que la morphologie en facette est due à la croissance concurrentielle de différents plans cristallographiques. La stabilisation de la phase tétragonale de ZrO2 a été analysée et discutée. En plus de la taille critique des cristallites, la stabilisation de la phase tétragonale est favorisée par deux autres mécanismes : la grande quantité des défauts cristallins et la morphologie des cristallites.
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Muehlemann, Anton. "Variational models in martensitic phase transformations with applications to steels." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:bb7f4ff4-0911-4dad-bb23-ada904839d73.

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This thesis concerns the mathematical modelling of phase transformations with a special emphasis on martensitic phase transformations and their application to the modelling of steels. In Chapter 1, we develop a framework that determines the optimal transformation strain between any two Bravais lattices and use it to give a rigorous proof of a conjecture by E.C. Bain in 1924 on the optimality of the so-called Bain strain. In Chapter 2, we review the Ball-James model and related concepts. We present some simplification of existing results. In Chapter 3, we pose a conjecture for the explicit form of the quasiconvex hull of the three tetragonal wells, known as the three-well problem. We present a new approach to finding inner and outer bounds. In Chapter 4, we focus on highly compatible, so called self-accommodating, martensitic structures and present new results on their fine properties such as estimates on their minimum complexity and bounds on the relative proportion of each martensitic variant in them. In Chapter 5, we investigate the contrary situation when self-accommodating microstructures do not exist. We determine, whether in this situation, it is still energetically favourable to nucleate martensite within austenite. By constructing different types of inclusions, we find that the optimal shape of an inclusion is flat and thin which is in agreement with experimental observation. In Chapter 6, we introduce a mechanism that identifies transformation strains with orientation relationships. This mechanism allows us to develop a simpler, strain-based approach to phase transformation models in steels. One novelty of this approach is the derivation of an explicit dependence of the orientation relationships on the ratio of tetragonality of the product phase. In Chapter 7, we establish a correspondence between common phenomenological models for steels and the Ball-James model. This correspondence is then used to develop a new theory for the (5 5 7) lath transformation in low-carbon steels. Compared to existing theories, this new approach requires a significantly smaller number of input parameters. Furthermore, it predicts a microstructure morphology which differs from what is conventionally believed.
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Marques, Leonel Vitorino Joaquim. "Transformations de phases du C60 sous pression." Université Joseph Fourier (Grenoble ; 1971-2015), 1996. http://www.theses.fr/1996GRE10188.

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Ce mémoire est consacré à l'étude du c60 sous pression. Le diagramme de phases pour le c60 a été établi pour des pressions inférieures à 80kbar. L'application de très hautes pressions (200kbar) à température ambiante transforme le c60 en carbone sp3 et en diamant. A plus basse pression et à haute température, le c60 est converti en carbone sp2 amorphe de type graphitique. Pour des pressions et des températures intermédiaires, trois nouvelles phases polymérisées du c60 ont été obtenues, la structure en cage y est conservée. La phase rhomboedrique et la phase quadratique sont des phases bi-dimensionnelles, la phase orthorhombique est une phase 1d. Dans toutes ces structures, les orientations moléculaires permettent la formation de liaisons intermoléculaires de type cycloaddition 2,2. La nature polymère de ces phases et le type de liaisons ont été obtenues par diffraction x, par calculs théoriques, puis confirmés par rmn solide et spectroscopie ir et raman. Nous suggérons aussi l'existence de polymères 3d à plus forte pression et températures. Leurs structures devraient correspondre à la formation de liaisons interplanaires entre les plans polymérisés
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Shen, Yu-Hsiang, and 沈友翔. "Investigation on the irradiation-induced the monoclinic to tetragonal phase transformation of zirconia." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/62982853007832410017.

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碩士
國立臺灣海洋大學
材料工程研究所
101
This research aims to investigate the irradiation-induced monoclinic (M)  tetragonal (T) phase transformation of pure M-phase zirconia free standing and nanocladded nano-particles, by using various ion sources and energies. The zirconia nano-particles were isolated and embedded into a non-reacting metal (silver) matrix, named nanocladding, by internal oxidation method, which were constrained by the Ag matrix and then would be sub¬jected to internal, or external hydrostatic pressure, potentially resulting in different variances from free standing zirconia nano-particles. Two separate specimens, i.e. well-prepared M-ZrO2 nano-particles with and without Ag cladded, were sequentially irradiated by using National Electrostatics Corporation 9SDH-II 3MV Tandem Accelerator with 1.5 MeV H+ and 3 MeV Fe2+in Institute of Physics Academia Sinica and High Voltage Engineering Europa 500 kV ion implanter with 100 keV H+ in National Tsing Hua University. The fluencies are from 1×1014 to 1×1016 ions/cm2. These irradiated specimens were studied and characterized by using X-Ray diffractometer (XRD) and transmission electron microscopy (TEM). The results show that the free standing zirconia nano-particles with the size of smaller than 30 nm appear M→T phase transformation after proton implantation with 1.5 MeV and 100 keV energy at the proton doses above 3×1015 ions/cm2, while no phase transformation occurs under the grain size larger than 30 nm. Apparently, there is a size effect of irradiation-induced M→T phase transformation of the free standing M-ZrO2 nano-particles by proton implantation. However, the irradiation-induced M→T phase transformation occurs after Fe2+ ions implantation with 3 MeV energy at the fluencies just above 1×1014 ions/cm2, regardless of the size smaller and larger than 30 nm. It suggests that the heavy ions (Fe2+) transmit much more energies to zirconia nano-particles than light ions (proton), leading to an much easier phase transformation. As for the zirconia nano-particles cladded by silver, the irradiation-induced M→T phase transformation didn’t occur by proton implantation with 1.5 MeV and 100 keV H+ energies at the fluences up to 1×1017 ions/cm2. However, it occurred M→T by Fe2+ implantation with 3 MeV energy at the fluences above 1×1016 ions/cm2. Since the mass of proton is obviously lighter than Fe2+ ion, the proton is vulnerable to deflect and scatter while encountering Ag atoms and zirconia molecules leading to the probability of colliding with zirconia molecules in the M-ZrO2 nano-particles nanocladded by Ag matrix much smaller than that in the free standing M-ZrO2 nano-particles. Moreover, in contrast to the irradiation-induced M→T phase transformation in the free standing zirconia nanoparticles by Fe2+ implantation, the needed Fe2+ dose for the irradiation-induced M→T phase transformation in the nanocladded M-ZrO2 nano-particles is much higher than that in the free standing M-ZrO2 nano-particles due to the much smaller cross-section area of colliding with M-ZrO2 nano-particles. In other words, the probability of colliding with zirconia molecules in the M-ZrO2 nano-particles nanocladded by Ag matrix is much smaller than that in the free standing M-ZrO2 nano-particles, resulting in higher Fe2+ dose needed to induce M→T phase transformation in the M-ZrO2 nano-particles nanocladded by Ag matrix.
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Mathevula, Langutani Eulenda. "Deep space radiations-like effects on VO2 smart nano-coatings for heat management in small satelittes." Diss., 2014. http://hdl.handle.net/10500/18408.

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Thermal control in spacecraft will be increasingly important as the spacecraft grows smaller and more compact. Such spacecraft with low thermal mass will have to be designed to retain or reject heat more efficiently. The passive smart radiation device (SRD) is a new type of thermal control material for spacecraft. Current space thermal control systems require heaters with an additional power penalty to maintain spacecraft temperatures during cold swings. Because its emissivity can be changed without electrical instruments or mechanical part, the use of SRD decreases the request of spacecraft power budget. The (SRD) based on VO2 films is one of the most important structures of the functional thermal control surface, being lighter, more advanced and without a moving devices. A large portion of the heat exchange between an object in space and the environment is performed throughout radiation, which is in turn determined by the object surface properties. The modulation device is coated on the spacecraft surface and thus provides a thermal window that can adapt to the changing conditions in orbit. VO2 is well known to have a temperature driven metal to insulator transition ≈ 68ᴼC accompanying a transformation of crystallographic structure, from monoclinic (M-phase, semiconductor) at temperature below 68ᴼC to tetragonal (R-phase, metal) at temperature above 68ᴼC. This transition temperature is accompanied by an increase of infrared reflectivity and a decrease of infrared emissivity with increasing temperature. This flexibility makes VO2 potentially interesting for optical, electrical, and electro-optical switches devices, and as window for energy efficiency buildings applications. This study reports on effect of thickness on VO2 as well as the effect of proton irradiation on VO2 for active smart radiation device (SRD) application. VO2 was deposited on mica by Pulsed laser deposition techniques. The thickness of the film was varied by varying the deposition time. To characterize VO2 the following techniques were performed: XRD, AFM, SEM, TEM, XPS, RBS, RAMAN and transport measurements for optical properties. The effect of proton irradiation was observed using the SEM, where the change in structure, from crystal grains to rods, was observed.
Physics
M.Sc. (Physics)
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Book chapters on the topic "Tetragonal to monoclinic transformation"

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Watanabe, M., S. Iio, K. Kuroda, H. Saka, and T. Imura. "Effect of Environmental Gas on Tetragonal to Monoclinic Transformation in Y-TZP." In Sintering ’87, 1161–66. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_195.

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Mamivand, Mahmood, Mohsen Asle Zaeem, and Haitham El Kadiri. "Phase Field Modeling of Tetragonal to Monoclinic Phase Transformation at Zirconium Oxide." In TMS2013 Supplemental Proceedings, 885–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663547.ch110.

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Sato, T., T. Endo, and M. Shimada. "Control of the Tetragonal to Monoclinic Phase Transformation of Yttria-doped Tetragonal ZrO2 Polycrystals by Annealing in Water." In Ceramic Microstructures ’86, 215–22. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1933-7_22.

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Rajendran, Mohan Kumar, Michael Budnitzki, and Meinhard Kuna. "Multi-scale Modeling of Partially Stabilized Zirconia with Applications to TRIP-Matrix Composites." In Austenitic TRIP/TWIP Steels and Steel-Zirconia Composites, 679–721. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42603-3_21.

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Abstract The understanding of how the microstructure influences the mechanical response is an essential pre-requisite for materials tailored to match specific requirements. The aim of this chapter is to further this understanding in the context of Mg-PSZ-TRIP-steel composites on three different scales using a set of methods ranging from phase-field simulations over micromechanics to continuum constitutive modeling. On the microscale, using a Ginzburg-Landau type phase-field model the effects of cooling- and stress-induced martensitic phase transformation in MgO-PSZ is clearly distinguished. Additionally with this method the role of energy barrier in variant selection and the effect of residual stress contributing to the stability of the tetragonal phase are also investigated. On the mesomechanical scale, an analytical 2D model for the martensitic phase transformation and self-accommodation of inclusions within linear elastic materials has been successfully developed. The influences of particle size and geometry, chemical driving force, temperature and surface energy on the $$t \rightarrow m$$ t → m transformation are investigated in a thermostatic approach. On the continuum scale, a continuum material model for transformation plasticity in partially stabilized zirconia ceramics has been developed. Nonlinear hardening behavior, hysteresis and monoclinic phase fraction during a temperature cycle are analyzed. Finally, The mechanical properties of a TRIP steel matrix reinforced by ZrO$$_2$$ 2 particles are analyzed on representative volume elements. Here the mechanical properties of the composite as function of volume fraction of both constituents and the strength of the interface are studied.
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Nono, Maria Carmo Andrade. "Tetragonal-to-Monoclinic Transformation Influence on the Mechanical Properties of CeO2- ZrO2 Ceramics." In Advanced Powder Technology IV, 506–11. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-984-9.506.

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Chaim, R., P. A. Labun, V. Lanteri, and A. H. Heuer. "HREM Study of a Tetragonal → Monoclinic Martensitic Interface in a Y2O3-Stabilized ZrO2 Alloy." In Ceramic Microstructures ’86, 203–13. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1933-7_21.

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Ledbetter, Hassel. "Martensite Crystallography of the δ→α (Cubic→Monoclinic) Transformation in Plutonium." In ICOMAT, 135–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803592.ch18.

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Matsui, Koji, Hidehiro Yoshida, and Yuichi Ikuhara. "Grain-Boundary Structure and Phase-Transformation Mechanism in Yttria-Stabilized Tetragonal Zirconia Polycrystal." In Materials Science Forum, 921–26. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-443-x.921.

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Matsuo, H., K. Ikeda, S. Hata, and H. Nakashima. "Stress-Induced Phase Transformation in the Vicinity of Vickers Indentations in 10mol% CeO2Doped Tetragonal ZrO2Polycrystal." In ICOMAT, 167–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803592.ch23.

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Gu, Y. J., Y. B. Chen, H. K. Wu, X. W. Huang, X. B. Liu, H. Z. Cui, Y. M. Wang, Z. N. Yang, C. L. Wang, and H. Huo. "Transformation from Monoclinic LiMnO2 to Spinel LixMn2O4 during Electrochemical Cycling." In High-Performance Ceramics V, 270–73. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.270.

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Conference papers on the topic "Tetragonal to monoclinic transformation"

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Abubakar, Abba Abdulhamid, Syed Sohail Akhtar, and Abul Fazal M. Arif. "Phase Transfomation Stress Field due to Hot Corrosion in the Top Coat of TBC." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63138.

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Due to the use of low quality fuels in Saudi Arabia, hot corrosion occurs at the top coat of Thermal Barrier Coatings (TBCs) as a result of the formation of a molten salt, V2O5, which penetrates it through either diffusion mechanism or the open porosities in the YSZ. The interaction between this molten salt and the Zirconia stablizer is a dissolution-precipitation type reaction which occurs throughout the Planar Reaction Zone (PRZ) and the Melt-Infiltrated Reaction Zone (MIRZ) leaching a new phase, YVO4, and also causing tetragonal to monoclinic phase transformation of Zirconia. Swelling due to transformation-mismatch plasticity causes the development of localized stresses in the topcoat which subsequently contributes to the premature failure of the coating. In the current work, a 1D-Phase field model was developed that could estimate the kinetics and micro-structural evolution during the isothermal (diffusional) tetragonal-to-monoclinic phase transformation at 900°C in the top coat. The result obtained from the Phase Field Model was sequentially coupled with Finite Element Method, and the resulting stress field in the top coat was predicted.
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Dubsky, J., B. J. Kolman, and A. Buchal. "Phase Composition Changes in Plasma Sprayed Zircon-Alumina Tubes." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1613.

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Abstract Protective tubes (Ø90x1500 mm) were manufactured by spraying with a water stabilized plasma gun. Mixtures of zircon (ZrSiO4) and alumina (Al2O3) were used as feedstock powders. Products made of these powders exhibit very good properties during thermal cycling. Previous results of the phase composition and phase changes were obtained from as-sprayed and annealed samples using X-ray diffractometry (XRD) and scanning electron microscopy. During plasma spraying zircon decomposed into ZrO2 and SiO2, which on impact and after rapid quenching formed a very fine eutectic mixture of tetragonal or monoclinic ZrO2 and amorphous SiO2. During this process alumina, in feedstock as α-phase (corundum), formed the spinel γ-phase. On annealing the y-phase transformed into the a-phase, whereas amorphous SiO2 crystallized and reacted with tetragonal ZrO2 to form ZrSiO4. Mullite (3Al2O3.2SiO2) was found at the highest annealing temperature of 1500°C when alumina reacted with SiO2. High temperature XRD was used for direct observation of phase changes during heating and cooling between room temperature and 1500°C in powdered as-sprayed deposits. This method confirmed the phase changes observed at room temperature in annealed samples, in particular the partial transformation of tetragonal to monoclinic ZrO2.
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Benešová, Barbora, and Radek Škoda. "Zirconium Dioxide as a Protective Layer of Zirconium Fuel Cladding." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30848.

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Zirconium is important because of its mechanical and neutronics properties combined with its extraordinary resistance against corrosion. It’s mainly usage in nuclear engineering is as a nuclear fuel cladding. Even though Zr layers are very resistant to neutron fluence at reactor operating temperatures, high pressure and high radiation doses, exothermic Zr oxidation in accident scenario still occurs. Hydrogen, and a newly created layer of zirconium dioxide, are undesirable products of the high temperature steam oxidation. ZrO2 adopts a monoclinic crystal structure at room temperature and transitions to tetragonal and cubic at higher temperatures. The volume expansion caused by the cubic to tetragonal to monoclinic transformation induces large stresses and these stresses cause ZrO2 to crack upon cooling from high temperatures. To stabilize ZrO2 other oxides may be added. Therefore ZrO2 with its high ionic conductivity makes it one of the most promising ceramics to protect fuel cladding and the paper focuses on properties of ZrO2 used on Zr fuel cladding of common power reactors.
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Li, Li, and Benjamin Peterson. "Thermal Phase Stability of Various Plasma Sprayed TBCs." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0192.

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Abstract The thermal phase stability of plasma sprayed TBC is presented and discussed. TBC phase transformation after various isothermal heat treatment processes was studied via Xray diffraction (XRD) and Raman Spectroscopy methods. The YSZ-Gd-Yb and 20YSZ TBCs demonstrated superior thermal phase stability as compared with the high and standard purity 8YSZ TBCs, although higher purity also helps delay the tetragonal to monoclinic phase transformation. The phase transformation appears to be suppressed by cooling at higher rates. This data presents a qualitative phase stability comparison between the various coatings. However, cooling rate has to be taken into consideration in determining the extent of phase instability during the coating design of aero turbine applications.
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Dubsky, J., K. Neufuss, and B. Kolman. "Phase Composition Changes in Annealed Plasma-Sprayed Zircon-Alumina Coatings." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0473.

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Abstract Phase transformations and/or decomposition of deposited compounds have an indisputable influence on materials properties of plasma sprayed deposits. Using water stabilized plasma, free-standing parts were manufactured from a mechanical mixture of zircon and alumina powders and annealed. The phase composition was determined by X-ray diffraction and the chemical composition was checked by x-ray microanalysis. ZrSiO4 during plasma spraying decomposes into ZrO2 and SiO2. In the as-sprayed condition, after a relatively fast quenching, the following phases can be found: a very fine eutectic mixture of tetragonal and monoclinic ZrO2, amorphous SiO2 and a spinel phase of Al2O3. On annealing for 2 hours at 1300 and 1500 °C the spinel Al2O3 transformed to corundum. At the same time, amorphous silica crystallized. Tetragonal ZrO2 transformed to the monoclinic modification and together with SiO2 formed again ZrSiO4. At the highest annealing temperature Al2O3 and SiO2 partialy reacted to form a small amount of mullite (3Al2O3.2SiO2).
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Razavi, A., and T. Hughes. "Effects of Oxygen Partial Pressure on Optical Properties of VO2." In Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.mf21.

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Vanadium dioxide is known to undergo a first order phase transformation at approximately 67°C. In its low temperature state (T<67°C) VO2 has a monoclinic structure, is semiconductive, and exhibits high transmission of a range of IR wavelengths. At temperatures greater than 67°C VO2 reverts to a tetragonal structure, becomes conductive, and exhibits high reflectance.1 The absorption coefficient of VO2 is relatively high below one micron2 and above thirteen microns3; therefore, changes in the optical properties of VO2 can be used most effectively between these wavelengths.
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Gogotsi, George G. "Raman Investigation and Mechanical Behavior of Zirconia." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0697.

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Abstract Raman microprobe analysis was performed of partially-stabilized ZrO2 ceramics and single crystals using the samples which were preliminary indented with a Vickers indenter at room temperature or subjected to bending at low temperatures. The addition of ferric oxide into Y-PSZ ceramics was found to intensify martensitic phase transformation in it and to enhance its fracture toughness. For single crystals the tetragonal-to-monoclinic phase transformation was found possible at fracture. It was established that inelastic Mg-PSZ ceramics at −50°...−60°C becomes in fact elastic but no relevant changes in Raman spectra were observed. A conclusion was made that further investigations are required to specify the known micromechanisms which govern the behavior of ZrO2 materials under loading.
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Moshkelgosha, Ehsan, and Mahmood Mamivand. "Anisotropic Phase-Field Modeling of Crack Growth in Shape Memory Ceramics: Application to Zirconia." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11695.

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Abstract Shape memory ceramics (SMCs) are promising candidates for actuators in extreme environments such as high temperature and corrosive applications. Despite outstanding energy dissipation, compared to metallic shape memory materials, SMCs suffer from sudden brittle fracture. While the interaction of crack propagation and phase transformation in SMCs have been subject of several experimental and theoretical studies, mainly at macroscale, the fundamental understanding of the interaction of crack propagation dynamics with evolving martensitic transformation is poorly understood. In this work we use the phase field technique to fully couple the martensitic transformation to the variational formulation of brittle fracture. The model is parameterized for zirconia which experiences tetragonal to monoclinic transformation during crack propagation. For the mode I of fracture, opening mode, crack shows an unusual propagation path which indicates the effect of phase transformation on crack path. The model is efficiently capable of predicting the crack initiation as well as propagation. The results show the dramatic effect of phase transformation on fracture toughening and crack propagation path.
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Huang, Xiao. "Effect of Co-Doping on Microstructure, Thermal and Mechanical Properties of Ternary Zirconia-Based Thermal Barrier Coating Materials." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59007.

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7YSZ (yttria stabilized zirconia) was co-doped with metal oxides of different valence, ionic radius and mass in order to investigate microstructural and property changes as a result of co-doping. Mechanical alloying process was used to produce the powder blends which were subsequently sintered at 1500°C for 120 hours. The results from SEM, XRD and DSC showed that the microstructures of the co-doped ternary oxides were affected by the amount of oxygen vacancies in the system, the co-dopant cation radius and mass. Increasing the number of oxygen vacancies by the addition of trivalent co-dopant (Yb2O3 and Sc2O3) as well as the use of larger cations promoted the stabilization of cubic phase. The tetravalent co-dopant (CeO2), on the other hand, had the effect of stabilizing tetragonal phase which may transform into monoclinic phase during cooling, depending on the concentration of tetravalent co-dopant and the mass. Smaller cation mass had the effect of reducing the transformation temperature from tetragonal to monoclinic phase. Pentavalent co-dopants (Nb2O5 and Ta2O5) were found to stabilize the tetragonal phase at high temperature; however, the stability of the tetragonal phase upon cooling was determined by the mass and ionic radius of the co-dopants. Cation clustering was observed during cooling in trivalent oxide co-doped 7YSZ while clustering of trivalent and pentavalent cations in pentavalent co-doped 7YSZ was not detected. Additionally, from the thermal conductivity measurement results, it was found that trivalent oxides exhibited the most significant effect on reducing the thermal conductivity of ternary oxides; this trend was followed by pentavalent co-doping oxides whereas the tetravalent CeO2 co-doped 7YSZ showed marginal effect. A semi-empirical thermal conductivity model was established based on defect cluster model and the predicted room temperature thermal conductivity values were found to be consistent with that measured experimentally. Furthermore, the incorporation of co-dopant oxide in 7YSZ was observed to substantially modify the elastic modulus of the ternary oxides. More specifically, the addition of co-dopant with larger cation radius was found to reduce the elastic modulus of 7YSZ due to the increase in lattice parameter(s).
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Gil-Flores, Lorena, María D. Salvador, Felipe L. Penaranda-Foix, Roberto Rosa, Paolo Veronesi, Cristina Leonelli, and Amparo Borrell. "LOW TEMPERATURE DEGRADATION BEHAVIOUR OF 10Ce-TZP/Al2O3 BIOCERAMICS OBTAINED BY MICROWAVE SINTERING TECHNOLOGY." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9887.

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Zirconia is one of the most used ceramics, especially for biomedical applications, due to its exceptional mechanical properties. However, it is commonly known that its properties can be diminished owing to a low temperature degradation (LTD). This phenomenon consists on a spontaneous phase transformation, from tetragonal to monoclinic, under certain conditions, which is accelerated when the samples are exposed under high levels of humidity at a temperature range between 20-300 ºC. In addition to the fact that the monoclinic phase presents worse mechanical properties than the tetragonal one, there is a volume change of 4% between phases that gives rise to defects in the material as microcracks. Due to this reason, zirconia prostheses failed catastrophically inside the human body between 1999 and 20011. Previous researches reveal that Al2O3 addition suppress the propagation of phase transformation2. Thus, the aim of the present work is to study the hydrothermal ageing of zirconia doped with ceria and toughened with alumina (10Ce-TZP/Al2O3) composite, which has been sintered by microwave employing two different frequencies: 2.45 and 5.8 GHz. Microwave heating technology is based on the absorption of electromagnetic radiation by the material, which allows the sample to be heated. So far, most microwave heating equipments use 2.45 GHz; accordingly, the novelty of this study is to employ a frequency of 5.8 GHz and to investigate its effect on LTD. LTD is carried out in an autoclaved in steam at 120 ºC and 1.2 bar, because these conditions accelerate the hydrothermal aging process3. In order to characterize the degraded samples, micro-Raman spectroscopy, AFM, nanoindentation technique and electronic microscopy have been performed. References 1. Norton, M. R., Yarlagadda, R., Anderson, G. H. J. Bone Joint Surg. Br., 2002, 84–B, 631–635. 2. Fabbri, P., Piconi, C., Burresi, E., Magnani, G., Mazzanti, F., Mingazzini, C. Dent. Mater., 2014. 3. Presenda, Á., Salvador, M. D., Moreno, R., Borrell, A. J. Am. Ceram. Soc., 2015, 98, 3680–3689.
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