Bibliographies thématiques / Perovskite to post-perovskite phase transition

Littérature scientifique sur le sujet « Perovskite to post-perovskite phase transition »

Auteur : Grafiati
Publié le 11 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Sommaire

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Perovskite to post-perovskite phase transition ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Perovskite to post-perovskite phase transition"

1

Hirose, Kei, Ryosuke Sinmyo et John Hernlund. « Perovskite in Earth’s deep interior ». Science 358, no 6364 (9 novembre 2017) : 734–38. http://dx.doi.org/10.1126/science.aam8561.

Texte intégral
Résumé :
Silicate perovskite-type phases are the most abundant constituent inside our planet and are the predominant minerals in Earth’s lower mantle more than 660 kilometers below the surface. Magnesium-rich perovskite is a major lower mantle phase and undergoes a phase transition to post-perovskite near the bottom of the mantle. Calcium-rich perovskite is proportionally minor but may host numerous trace elements that record chemical differentiation events. The properties of mantle perovskites are the key to understanding the dynamic evolution of Earth, as they strongly influence the transport properties of lower mantle rocks. Perovskites are expected to be an important constituent of rocky planets larger than Mars and thus play a major role in modulating the evolution of terrestrial planets throughout the universe.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Murakami, M. « Post-Perovskite Phase Transition in MgSiO3 ». Science 304, no 5672 (7 mai 2004) : 855–58. http://dx.doi.org/10.1126/science.1095932.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Kojitani, Hiroshi, Yuichi Shirako et Masaki Akaogi. « Post-perovskite phase transition in CaRuO3 ». Physics of the Earth and Planetary Interiors 165, no 3-4 (décembre 2007) : 127–34. http://dx.doi.org/10.1016/j.pepi.2007.09.003.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Gay, Jeffrey P., Lowell Miyagi, Samantha Couper, Christopher Langrand, David P. Dobson, Hanns-Peter Liermann et Sébastien Merkel. « Deformation of NaCoF<sub>3</sub&gt ; perovskite and post-perovskite up to 30 GPa and 1013 K : implications for plastic deformation and transformation mechanism ». European Journal of Mineralogy 33, no 5 (30 septembre 2021) : 591–603. http://dx.doi.org/10.5194/ejm-33-591-2021.

Texte intégral
Résumé :
Abstract. Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF3 is deformed in a resistive-heated diamond anvil cell (DAC) up to 30 GPa and 1013 K. The in situ state of the sample, including crystal structure, stress, and texture, is monitored using X-ray diffraction. A phase transformation from a perovskite to a post-perovskite structure is observed between 20.1 and 26.1 GPa. Normalized stress drops by a factor of 3 during transformation as a result of transient weakening during the transformation. The perovskite phase initially develops a texture with a maximum at 100 and a strong 010 minimum in the inverse pole figure of the compression direction. Additionally, a secondary weaker 001 maximum is observed later during compression. Texture simulations indicate that the initial deformation of perovskite requires slip along (100) planes with significant contributions of {110} twins. Following the phase transition to post-perovskite, we observe a 010 maximum, which later evolves with compression. The transformation follows orientation relationships previously suggested where the c axis is preserved between phases and hh0 vectors in reciprocal space of post-perovskite are parallel to [010] in perovskite, which indicates a martensitic-like transition mechanism. A comparison between past experiments on bridgmanite and current results indicates that NaCoF3 is a good analogue to understand the development of microstructures within the Earth's mantle.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Dutta, Rajkrishna, Eran Greenberg, Vitali B. Prakapenka et Thomas S. Duffy. « Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa ». Proceedings of the National Academy of Sciences 116, no 39 (10 septembre 2019) : 19324–29. http://dx.doi.org/10.1073/pnas.1909446116.

Texte intégral
Résumé :
Neighborite, NaMgF3, is used as a model system for understanding phase transitions in ABX3 systems (e.g., MgSiO3) at high pressures. Here we report diamond anvil cell experiments that identify the following phases in NaMgF3 with compression to 162 GPa: NaMgF3 (perovskite) → NaMgF3 (post-perovskite) → NaMgF3 (Sb2S3-type) → NaF (B2-type) + NaMg2F5 (P21/c) → NaF (B2) + MgF2 (cotunnite-type). Our results demonstrate the existence of an Sb2S3-type post-post-perovskite ABX3 phase. We also experimentally demonstrate the formation of the P21/c AB2X5 phase which has been proposed theoretically to be a common high-pressure phase in ABX3 systems. Our study provides an experimental observation of the full sequence of phase transitions from perovskite to post-perovskite to post-post-perovskite followed by 2-stage breakdown to binary compounds. Notably, a similar sequence of transitions is predicted to occur in MgSiO3 at ultrahigh pressures, where it has implications for the mineralogy and dynamics in the deep interior of large, rocky extrasolar planets.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Martin, C. David, Yue Meng, Vitali Prakapenka et John B. Parise. « Gasketing optimized for large sample volume in the diamond anvil cell : first application to MgGeO3and implications for structural systematics of the perovskite to post-perovskite transition ». Journal of Applied Crystallography 41, no 1 (16 janvier 2008) : 38–43. http://dx.doi.org/10.1107/s0021889807050029.

Texte intégral
Résumé :
Structure models of MgGeO3post-perovskite (Cmcm) are presented, along with a structure survey, demonstrating that all perovskite, post-perovskite and CaIrO3-type structures (ABX3) have specific ranges of the volume ratio between cation-centered polyhedra (VA:VB). The quality of the reported diffraction data and MgGeO3structure models is enhancedviaimplementation of a new graphite gasket for the diamond anvil cell, which stabilizes a larger sample volume, improving powder statistics during X-ray diffraction, andviathe thermal insulation required to achieve ultra-high temperatures while laser-heating samples at pressures near 100 GPa. The structure survey supports the theory that the pressure–temperature conditions under which the perovskite/post-perovskite phase transition occurs can be estimated by extrapolating the change inVA:VBto a value of 4, which corresponds to a maximum tilt ofBX6octahedra in the perovskite structure (Pbnm) where inter-octahedral anion–anion distances match the average intra-octahedral anion–anion distance. Once these short inter-octahedral distances between anions are reached in the perovskite structure, further tilting of octahedra and decrease of theVA:VBratio does not occur, driving the transition to post-perovskite structure as pressure is increased.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Lin, Jia, Hong Chen, Yang Gao, Yao Cai, Jianbo Jin, Ahmed S. Etman, Joohoon Kang et al. « Pressure-induced semiconductor-to-metal phase transition of a charge-ordered indium halide perovskite ». Proceedings of the National Academy of Sciences 116, no 47 (4 novembre 2019) : 23404–9. http://dx.doi.org/10.1073/pnas.1907576116.

Texte intégral
Résumé :
Phase transitions in halide perovskites triggered by external stimuli generate significantly different material properties, providing a great opportunity for broad applications. Here, we demonstrate an In-based, charge-ordered (In+/In3+) inorganic halide perovskite with the composition of Cs2In(I)In(III)Cl6 in which a pressure-driven semiconductor-to-metal phase transition exists. The single crystals, synthesized via a solid-state reaction method, crystallize in a distorted perovskite structure with space group I4/m with a = 17.2604(12) Å, c = 11.0113(16) Å if both the strong reflections and superstructures are considered. The supercell was further confirmed by rotation electron diffraction measurement. The pressure-induced semiconductor-to-metal phase transition was demonstrated by high-pressure Raman and absorbance spectroscopies and was consistent with theoretical modeling. This type of charge-ordered inorganic halide perovskite with a pressure-induced semiconductor-to-metal phase transition may inspire a range of potential applications.
Styles APA, Harvard, Vancouver, ISO, etc.
8

LI, YANLING, et ZHI ZENG. « FIRST-PRINCIPLES STUDY OF THE STRUCTURAL, ELECTRONIC AND OPTICAL PROPERTIES OF MgSiO3 AT HIGH PRESSURE ». International Journal of Modern Physics C 20, no 07 (juillet 2009) : 1093–101. http://dx.doi.org/10.1142/s0129183109014242.

Texte intégral
Résumé :
The high-pressure behavior of perovskite ( MgSiO 3) is studied based on density functional simulations within generalized gradient approximation (GGA). All calculations are performed by using the linear augmented plane waves plus local orbital (LAPW+lo) method to solve the scalar-relativistic Kohn-Sham equations. The static calculations predict a perovskite (pnma phase) — post-perovskite (Cmcm phase) transition occurring at 86 gigapascals (GPa). The similar bulk modulus values, differing only 3 GPa, are given by using three kinds of equation of states. The electronic structure and optical properties of MgSiO 3 at phase transition pressure are also discussed.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Tateno, Shigehiko, Kei Hirose, Nagayoshi Sata et Yasuo Ohishi. « Solubility of FeO in (Mg,Fe)SiO3 perovskite and the post-perovskite phase transition ». Physics of the Earth and Planetary Interiors 160, no 3-4 (mars 2007) : 319–25. http://dx.doi.org/10.1016/j.pepi.2006.11.010.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

Dixon, Charlotte A. L., Jason A. McNulty, Steven Huband, Pamela A. Thomas et Philip Lightfoot. « Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3 ». IUCrJ 4, no 3 (8 mars 2017) : 215–22. http://dx.doi.org/10.1107/s2052252517002226.

Texte intégral
Résumé :
The perovskite Li0.2Na0.8NbO3is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space groupR3c) transformsviaa first-order transition to a polar tetragonal phase (space groupP42mc) in the region 150–300°C; these two phases correspond to Glazer tilt systemsa−a−a−anda+a+c−, respectively. At 500°C a ferroelectric–paraelectric transition takes place fromP42mctoP42/nmc, retaining thea+a+c−tilt. Transformation to a single-tilt system,a0a0c+(space groupP4/mbm), occurs at 750°C, with the final transition to the aristotype cubic phase at 850°C. TheP42mcandP42/nmcphases have each been seen only once and twice each, respectively, in perovskite crystallography, in each case in compositions prepared at high pressure.
Styles APA, Harvard, Vancouver, ISO, etc.
Plus de sources

Thèses sur le sujet "Perovskite to post-perovskite phase transition"

1

Chu, Fan. « The ferroelectric phase transition in complex perovskite relaxors / ». [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1248.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Qasim, Ilyas. « Structural and Electronic Phase Transitions in Mixed Transition Metal Perovskite Oxides ». Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10029.

Texte intégral
Résumé :
The reported multiferroic perovskite series Sr1-xAxTi1/2Mn1/2O3 has been the subject of numerous structural studies, without reaching consensus. In the current work, the cubic Pm3 ̅m is confirmed for end member SrTi1/2Mn1/2O3 in the Sr1-xAxTi1/2Mn1/2O3 ( A= Ca, La; 0 ≤ x ≤ 1) series. The Pm3 ̅m  I4/mcm  Pbnm structural evolution was observed with increased doping level of Ca. A cubic Pm3 ̅m  rhombohedral R3 ̅c transition occurred when La is substituted instead of Ca. Interesting magnetic behaviours were observed and the major contribution to this was concluded to be the mixed Mn4+/Mn3+ ratio. Ru and Ir have almost identical ionic radii and behave similarly in many ways. Remarkably the structure and properties of SrRuO3 and SrIrO3 are different. The current study revealed that the divalent transition metal doped materials of the type SrR1-xMxO3 (R = Ru, Ir, and M = 3d transition metals) are isostructural. This was achieved by the synthesis of a number of new materials of the type SrIr1-xMxO3. Therefore, these two series are comparatively described in the thesis. The structure and physical properties of the iron doped series SrIr1-xFexO3 are found to be different from those of the divalent doped ones, and this was even true for Ru analogues. Therefore, Fe-doped SrRuO3 and SrIrO3, based on the results of the same level doped materials are presented in a separate chapter. In the final chapter, the impact of Cu2+ doping on the structure and electronic properties of LaCrO3 is described. In order to understand structure property relationships, all the materials structurally characterised have had magnetic and resistivity measurements conducted. Special attention is given to realise the correlations between structure, magnetism, and conductivity.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Parisi, Filippo. « A Bader’s topological approach for the characterization of pressure induced phase transitions ». Doctoral thesis, Università degli studi di Trieste, 2012. http://hdl.handle.net/10077/7420.

Texte intégral
Résumé :
2010/2011
In questo lavoro è stata messa a punto una metodologia basata sull’analisi topologica della densità elettronica secondo la teoria di Bader che ha permesso di indagare la stabilità di fasi mineralogiche in condizioni di alta pressione. In una prima fase è stata caratterizzata la decomposizione della ringwoodite (olivina-γ) in Mg-perovskite e periclasio ( post spinel phase transition) che si ritiene essere responsabile della discontinuità sismica che si osserva a 660 Km di profondità, tra la zona di transizione del mantello ed il mantello inferiore. Lo scopo del lavoro è stato quello di ottenere informazioni sulla disposizione degli elettroni nella struttura cristallina e sulla evoluzione al variare delle condizioni di pressione. L’analisi effettuata ha mostrato l’instaurarsi di una forte instabiltà strutturale (caratterizzata da una “conflict catastrophe”) nella ringwoodite a circa 30 GPa. Tale risultato conferma il coinvolgimento della transizione di fase “post-spinel”nella discontinuità sismica a 660 Km. In una seconda fase la procedura è stata applicata alla fase Mg-perovskite allo scopo di testarne la validità. Lo studio dell’evoluzione della topologia della densità elettronica nel range di pressione da 0 a 200 GPa ha permesso di individuare una regione di stabilità della fase perovskitica (da circa 22 a circa 124 GPa) delimitata tra due “fold catastrophes”. Le due “fold catastrophes” si hanno entrambe in prossimità di discontinuità sismiche: la prima, attribuita alla transizione di fase da ringwoodite a Mg-perovskite + periclasio corrisponde alla discontinuità sismica a 660 Km e la seconda, attribuita alla transizione da Mg-perovskite a post-perovskite a circa 130 GPa, osservata a circa 2600 Km di profondità, tra il mantello profondo e il D′′-layer, poco prima della discontinuità di Gutemberg a 2900 Km.
XXIV Ciclo
1975
Styles APA, Harvard, Vancouver, ISO, etc.
4

Ruette, Benjamin Thibault. « Induced Phase Transition in Magnetoelectric BiFeO3 Crystals, Thin-layers and Ceramics ». Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/42638.

Texte intégral
Résumé :
Bismuth ferrite (BiFeO₃) is a magneto-electric material which exhibits simultaneously ferroelectric and antiferromagnetic properties. We have used high-field electron spin resonance (ESR) as a local probe of the magnetic order in the magnetic range of 0-25 Tesla. With increasing magnetic field, an induced transition has been found between incommensurately modulated cycloidal antiferromagnetic and homogeneous magnetized spin state. The data reveal a number of interesting changes with increasing field, including: (i) significant changes in the ESR spectra; (ii) hysteresis in the spectra near the critical field. We have analyzed the changes in the ESR spectra by taking into account the magnetic anisotropy of the crystal and the homogeneous anti-symmetric Dzyaloshinsky-Moria exchange. We have also investigated phase induced transition by epitaxial constraint, and substituent and cystalline solution effects. Variously oriented BiFeO₃ epitaxial thin films have been deposited by pulsed laser deposition. Dramatically enhanced polarization has been found for (001)c, (110)c, and (111)c films, relative to that of BiFeO₃ crystals. The easy axis of spontaneous polarization lies close to (111)c for the variously oriented films. BiFeO₃ films grown on (111)c have a rhombohedral structure, identical to that of single crystals. Whereas, films grown on (110)c or (001)c are explained in terms of an epitaxially-induced transition between cycloidal and homogeneous spin states, via magneto-electric interactions. Finally, lanthanum modified BiFeO₃-xPbTiO₃ crystalline solutions have been found to have a large linear magneto-electric coefficient, ∝p. The value of ∝p (2.5x10⁻⁹ s/m or C/m²-Oe) is ∼10x greater than that of any other material (cg., Cr₂O₃ ∼2.5x10⁻¹⁰ s/m), and many order(s) of magnitude higher than unmodified BiFeO₃ crystals. The data also reveal: (i) that ∝p is due to a linear coupling between polarization and magnetization; and (ii) that ∝p is independent of dc magnetic bias and ac magnetic field. We show that the ME effect is significantly enhanced due to the breaking of the transitional invariance of a long-period spiral spin structure, via randomly distributed charged imperfections.
Master of Science
Styles APA, Harvard, Vancouver, ISO, etc.
5

Yang, Zhuo. « Investigation of the excitonic properties of hybrid and fully inorganic perovskite using magneto-spectroscopy ». Thesis, Toulouse, INSA, 2018. http://www.theses.fr/2018ISAT0004/document.

Texte intégral
Résumé :
Au cours des dernières années, les perovskites hybrides organiques-inorganiques ont été employées en tant qu’absorbeurs de lumière, en raison de leurres excellentes propriétés optiques et électroniques. L’efficacité de conversion des photons des cellules solaires hybrides à base de perovskites a augmenté de 6,9% à 23,6% au cours des dernières années. Le but de cette thèse est d’étudier les propriétés optiques et électroniques des perovskites à l’aide de spectroscopie magnéto-optique. Nous avons étudié la relation entre les propriétés excitoniques et la microstructure des perovskites hybrides. Nous avons effectué des mesures de magnéto-transmission sur des couches minces polycristallines de MAPbI3 et des mesures de magnéto-réflectivité sur un monocristal de MAPbI3. Nous avons monté que, à basse température, l’énergie de liaison de l’exciton et sa masse réduite sont les mêmes pour tous les échantillons de MAPbI3 indépendamment de la taille des cristaux.Ensuite, nous avons étudié les propriétés électroniques des perovskites entièrement inorganiques, à savoir les composés CsPbX3 (X = I ou Br ou un mélange de ceux-ci). En effectuant des mesures de magnéto-transmission sur CsPbX3, nous avons déterminé les énergies de liaison de l’exciton et la masse réduite avec une grande précision. Une comparaison des valeurs de constante diélectrique des perovskites inorganiques et inorganiques montre que, à basse température lorsque les mouvements des cations organiques sont interdits, la contribution dominante à l’écrantage diélectrique estliée au mouvement relatif dans la cage à base de halogénures de plomb
Optical and electronic properties. The photon conversion efficiency of hybrid perovskite based solar cells has increased from 6.9% to 23.6% within the last few years. The aim of this thesis is to investigate the optical and electronic properties of perovskite materials using magneto-optical techniques. We have investigated the relationship between the excitonic properties and the microstructure of hybrid perovskites. We have performed magneto-transmission measurement on MAPbI3 polycrystalline thin films and magneto-reflectivity measurement on a MAPbI3 single crystal. We find that, at low temperature, the exciton binding energy and reduced mass are the same for all MAPbI3 samples with a variety of crystal grain sizes.We have also investigated the electronic properties of the fully inorganic perovskites, namely CsPbX3 compounds (X = I or Br or a mixture of those). By performing the magneto-transmission measurement on CsPbX3, we have determined the exciton binding energies and reduced mass with high accuracy. A comparison of the values of dielectric constant for the fully inorganic and the hybrid organic-inorganic perovskites indicates that, at low temperature when the organic cations are frozen, the dominant contribution to the dielectric screening is related to the relative motion within the lead halide cage
Styles APA, Harvard, Vancouver, ISO, etc.
6

Gunatilleke, Wilarachchige D. C. B. « Analysis and New Applications of Metal Organic Frameworks (MOF) : Thermal Conductivity of a Perovskite-type MOF and Incorporation of a Lewis Pair into a MOF ». Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7514.

Texte intégral
Résumé :
Metal organic frameworks have gained much attention due to their tunable pore sizes and very high surface areas. With the discovery many of these type materials the need has raised to look into new applications of theses porous frameworks. This thesis focuses on the synthesis of a new perovskite-type metal organic framework and measurement of its thermal conductivity in search of its applicability as a thermoelectric material. The second part of this work focuses on the synthesis of a metal organic framework incorporated with a Lewis pair for the first time. The optimum loading amount of the Lewis pair into the framework was also investigated.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Joo, Gi-Tae. « Nouvelles phases ferroélectriques non stoechiométriques de type perovskite ou LiTaO3 ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 1986. http://tel.archives-ouvertes.fr/tel-00203505.

Texte intégral
Résumé :
Etude de la constante diélectrique, spectres Mössbauer et RMN. Les transitions de phases sont étudiées par diffraction RX et mesures diélectriques. Les systèmes étudiés sont : PbTiO3-1/2Pb2Fe2O5-CaTiO3-1/2Ca2fE2O5; Li2O-Ta2O5-MgO; Li2O-Ta2O5-ZnO; Li2O-Ta2O5-MgO.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Wang, Di. « Some Aspects of the Crystal Chemistry of Perovskites under High Pressures ». Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/37733.

Texte intégral
Résumé :
This thesis makes contributions to the methodology of quantitative description of the tilting systems of perovskite structures and theoretical analysis of high-pressure phase transitions of representative perovskites. Chapter 1 and 2 introduce the perovskite structures, tilting classification and descriptions. The structures in each of the 15 tilt systems have been decomposed in to the amplitudes of symmetry-adapted modes in order to provide a clear and unambiguous definition of the tilt angles. A general expression in terms of tilt angles for the ratio of the volumes of the two polyhedra within the perovskite structure is derived. Chapter 3 uses the first-principles plane-wave pseudopotential calculations to investigate the high-pressure to phase transition and elasticity of LaAlO3 perovskite. This second order transition is determined to occur at ~14 GPa by the pressure variation of the squared frequency of the soft R-point mode in the structure. Elastic moduli are inverted from the calculated stress-strain data by the singular value decomposition method. The Landau parameters for this phase transition are calibrated from the calculation results. Chapter 4 uses the same method to investigate the high-pressure phase transitions and elasticity of YAlO3 perovskite. The Pnma, Imma, I4/mcm, , perovskite structures and the NH4CdCl3-, Gd2S3-, U2S3-, CaIrO3-type structures are considered. A continuous Pnma to Imma transition occurs at ~89 GPa, determined from the soft Z-point mode of the Imma structure. Then, a discontinuous Imma to I4/mcm transition occurs at ~100 GPa, suggested by the relative enthalpies and phonon dispersions. The elasticities of the Pnma, Imma and I4/mcm structures show mechanical stabilities compatible with the phase transitions. The NH4CdCl3- and CaIrO3-type structures are dynamically stable although not energetically favorable. The relative A/B site polyhedral volume ratios are found to qualitatively reproduce the relative enthalpies of the perovskite structures.
Ph. D.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Berini, Bruno. « Elaboration de couches minces de SmFeO3 et LaNiO3, de structure perovskite, par dépôt laser pulséEtudes associées des transitions de phase à haute température par ellipsométrie spectroscopique in situ ». Phd thesis, Université de Versailles-Saint Quentin en Yvelines, 2007. http://tel.archives-ouvertes.fr/tel-00243093.

Texte intégral
Résumé :
Ce mémoire présente une étude de la préparation de couches minces du SmFeO3 (SFO) et du LaNiO3 (LNO) par ablation laser.
L'étude s'est d'abord focalisée sur la croissance du SFO sur silice amorphe afin de déterminer les conditions de croissance. Les épaisseurs sont mesurées in situ pendant la croissance par ellipsométrie spectroscopique. La variation thermique des indices optiques ainsi que les paramètres de maille présentent deux transitions qui semblent être corrélées aux températures de Curie (Tc) et de réorientation de spin (TRS). Une croissance épitaxiale du SFO (cube sur cube) sur STO (001) a été aussi obtenue. Les mesures magnétiques à l'ambiante (SQUID) montrent que les moments magnétiques pointent dans la direction perpendiculaire au film, c'est à dire suivant c, axe de facile aimantation à haute température (T> TRS) contrairement aux prévisions (axe a).
Une optimisation des températures de substrat et de pression d'oxygène a été ensuite réalisée lors de la croissance épitaxiale (cube sur cube) du LNO sur STO (001). La variation thermique des indices optiques, linéaire, présente un changement de pente dans la gamme [200-300°C]. L'ellipsométrie permet également la détection des transitions métal-isolant associées à la réduction et ré-oxygénation des films. La cinétique de la ré-oxygénation est détaillée ainsi que le contrôle de l'état d'oxydation.
Enfin, nous avons étudié les hétérostructures SFO/LNO/STO et SFOII/LNOII/SFOI/LNOI /STO. Nous avons montré que SFO croit de manière épitaxiale (cube sur cube) sur LNO. L'influence des épaisseurs de SFO et de LNOII sur les propriétés de transport à basse température des empilements est finalement démontrée.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Madon, Michel. « Cellules à enclumes de diamant et microscopie électronique en transmission : étude expérimentale des transformations de phase du manteau terrestre ». Paris 6, 1986. http://www.theses.fr/1986PA066123.

Texte intégral
Résumé :
Changements de phase associés aux discontinuités sismiques de 400 et 700km et conséquences sur la rhéologie du manteau. Etude des transitions polymorphiques entre les trois structures alpha , beta et gamma que peut prendre l'olivine et la décomposition de spinelle en pérovskite et magnésiowüstite. Etude réalisée en microscopie électronique en transmission sur des échantillons provenant de météorites choquées ou synthétisées à très haute pression et température dans une cellule à enclume de diamant.
Styles APA, Harvard, Vancouver, ISO, etc.
Plus de sources

Livres sur le sujet "Perovskite to post-perovskite phase transition"

1

Kei, Hirose, dir. Post-perovskite : The last mantle phase transition. Washington, DC : American Geophysical Union, 2007.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Hirose, Kei, John Brodholt, Thorne Lay et David Yuen, dir. Post-Perovskite : The Last Mantle Phase Transition. Washington, D. C. : American Geophysical Union, 2007. http://dx.doi.org/10.1029/gm174.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Lay, Thorne, David Yuen, Kei Hirose et John Brodholt. Post-Perovskite : The Last Mantle Phase Transition. American Geophysical Union, 2013.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Lay, Thorne, David Yuen, Kei Hirose et John Brodholt. Post-Perovskite : The Last Mantle Phase Transition. American Geophysical Union, 2013.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Lay, Thorne, David Yuen, Kei Hirose et John Brodholt. Post-Perovskite : The Last Mantle Phase Transition. American Geophysical Union, 2013.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Lay, Thorne, David Yuen, Kei Hirose et John Brodholt. Post-Perovskite : The Last Mantle Phase Transition. Wiley & Sons, Limited, John, 2013.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Woodward, Patrick M. Structural distortions, phase transitions, and cation ordering in the perovskite and tungsten trioxide structures. 1996.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "Perovskite to post-perovskite phase transition"

1

Akaogi, Masaki. « Post-perovskite Transition in ABX3 and Phase Transitions in AO2 ». Dans High-Pressure Silicates and Oxides, 133–55. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6363-6_8.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Hirose, Kei, John Brodholt, Thorne Lay et David A. Yuen. « An introduction to post-perovskite : The last mantle phase transition ». Dans Geophysical Monograph Series, 1–7. Washington, D. C. : American Geophysical Union, 2007. http://dx.doi.org/10.1029/174gm02.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Akaogi, Masaki. « Phase Transitions of Pyroxene and Garnet, and Post-spinel Transition Forming Perovskite ». Dans High-Pressure Silicates and Oxides, 93–114. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6363-6_6.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Hirose, Kei. « Discovery of post-perovskite phase transition and the nature of D″ layer ». Dans Geophysical Monograph Series, 19–35. Washington, D. C. : American Geophysical Union, 2007. http://dx.doi.org/10.1029/174gm04.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Yuen, David A., Ctirad Matyska, Ondřej Čadek et Masanori Kameyama. « The dynamical influences from physical properties in the lower mantle and post-perovskite phase transition ». Dans Geophysical Monograph Series, 249–70. Washington, D. C. : American Geophysical Union, 2007. http://dx.doi.org/10.1029/174gm17.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Sun, Daoyuan, Don Helmberger, Xiaodong Song et Stephen P. Grand. « Predicting a global perovskite and post-perovskite phase boundary ». Dans Geophysical Monograph Series, 155–70. Washington, D. C. : American Geophysical Union, 2007. http://dx.doi.org/10.1029/174gm12.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Yagi, Takehiko. « Post-perovskite Phase : Findings, Structure and Property ». Dans Physics and Chemistry of the Earth’s Interior, 185–89. New York, NY : Springer New York, 2009. http://dx.doi.org/10.1007/978-1-4419-0346-4_12.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
8

Tyunina, Marina. « Ferroelectric Phase Transitions in Epitaxial Perovskite Films ». Dans Nanoscale Ferroelectrics and Multiferroics, 617–44. Chichester, UK : John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118935743.ch19.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
9

Lemanov, V. V. « Phase Transitions in Incipient Ferroelectrics of Perovskite Structure with Impurities ». Dans Defects and Surface-Induced Effects in Advanced Perovskites, 329–40. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4030-0_33.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

Bukowinski, Mark S. T., et George H. Wolf. « Equation of State and Possible Critical Phase Transitions in MgSiO3 Perovskite at Lower-Mantle Conditions ». Dans Structural and Magnetic Phase Transitions in Minerals, 91–112. New York, NY : Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3862-1_5.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Perovskite to post-perovskite phase transition"

1

Xue, Jie, et Xiaobao Xu. « Photon-induced reversible phase transition in CsPbBr3 perovskite ». Dans Information Storage System and Technology. Washington, D.C. : OSA, 2019. http://dx.doi.org/10.1364/isst.2019.jw4a.24.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

« PHASE TRANSITION PECULIARITIES IN BaTiO3-BASED PEROVSKITE SUPERLATTICES ». Dans Perspektivnye materialy s ierarkhicheskoy strukturoy dlya novykh tekhnologiy i nadezhnykh konstruktsiy, Khimiya nefti i gaza. Tomsk State University, 2018. http://dx.doi.org/10.17223/9785946217408/298.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Maslova, O. A., Yu I. Yuzyuk, N. Ortega, A. Kumar, S. A. Barannikova et R. Katiyar. « Phase transition peculiarities in BaTiO3-based perovskite superlattices ». Dans PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083433.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

MENG, JIAN, JINGPING WANG, JING FENG, HIROHISA SATOH et NAOKI KAMEGASHIRA. « STRUCTURAL PHASE TRANSITION IN THE LAYERED PEROVSKITE COMPOUND BaTb2Mn2O7 ». Dans Proceedings of the International Symposium on Solid State Chemistry in China. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776846_0022.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Ali, Anzar, G. Sharma et Yogesh Singh. « Critical behavior near the ferromagnetic phase transition in double perovskite Nd2NiMnO6 ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032637.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

SOBOLEV, V. L., et V. M. ISHCHUK. « PHASE TRANSITION BETWEEN FERROELECTRIC AND ANTIFERROELECTRIC STATES AND TWO-PHASE NUCLEATION IN PEROVSKITE FERROELECTRICS ». Dans Proceedings of the 8th Asia-Pacific Physics Conference. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811523_0076.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Mosses, R. W., J. P. R. Wells, T. P. J. Han, H. G. Gallagher et M. Yamaga. « Spectroscopy of Rare-Earth Doped Perovskite Phase Strontium Lanthanum Aluminate ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh47.

Texte intégral
Résumé :
Strontium lanthanum aluminate (SrLaAlO4) belongs to a wide family of compounds with the general formula ABCO4 (where A denotes an alkaline earth cation: B denotes Y. Sc or a trivalent rare earth element and C denotes Al, Ga or a transition metal ion). This material crystallises in the perovskite phase, with tetragonal K2NiF4 structure having space group 14/mmm. The structure is composed of CO6 layers in the ab plane. The C cations are surrounded by six oxygens and sit in slightly distorted octahedral sites. Between these layers, the A cations and trivalent B cations are randomly distributed in nine co-ordinated sites of C4v symmetry. The random distribution of Sr2+ and La3+ ions leads to a structural disorder that causes inhomogeneous broadening of the spectral lines of rare-earth ions doped into these crystals.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Yarmolenko, Sergey, Kristofer Gordon, Brandon Hancock, Vladislav Kharton et Jag Sankar. « Characterization of (La0.9Sr0.1)0.95Cr0.85Mg0.10Ni0.05O3−δ Ceramics for Perovskite Related Membrane Reactor ». Dans ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43845.

Texte intégral
Résumé :
(La0.9Sr0.1)0.95Cr0.85Mg0.10Ni0.05O3 (LSCMN) ceramics sintered at temperatures 1100–1700°C in air were characterized using powder x-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive x-ray spectroscopy, transmission electron microscopy, differential scanning calorimetry, and inductively-coupled plasma spectroscopic analysis. Pervoskite ceramics with the highest density (porosity between 2–5%) were sintered at 1650°C for 24 hours. Secondary phases at a level of 3–5% porousity have been detected in the LSCMN initial powder received and sintered samples. LSCMN initial powder and ceramics exist in orthorhombic phase at room temperature and exhibits a first order phase transition into rhombohedral phase in the temperature range 70–95°C. Temperature of phase transition depends on grain size. Hardness and fracture toughness of LSCMN were studied by nanoindentation and microindentation methods. At low indentation depths hardness values depend significantly on the number of grains effected by the indent and crack formation. Indentation size effect was quantified in terms of Nix-Feng and power-low models. At high loads the apparent hardness is almost two times less than hardness of LSCMN monocrystalls.
Styles APA, Harvard, Vancouver, ISO, etc.
9

GEGUZINA, G. « CORRELATION BETWEEN INTERATOMIC BOND STRAINS AND PHASE TRANSITION TEMPERATURES OF PEROVSKITE-LIKE COMPLEX OXIDES ». Dans Proceedings of the XVIII Conference. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811325_0028.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

Runka, T., M. Głowacki, M. Berkowski, M. Drozdowski, P. M. Champion et L. D. Ziegler. « Phase Transition In Perovskite LaGaO[sub 3] Crystals Doped With Sr And Mn : Studied By Raman Spectroscopy ». Dans XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482338.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
Vous pouvez également être intéressé par les bibliographies sur le sujet « Perovskite to post-perovskite phase transition » pour d’autres types de sources :
Articles de revues Thèses
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie