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Literatura académica sobre el tema "Borosilicates de baryum"

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Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Borosilicates de baryum"

Moridi, G. R., A. Nouruzi y C. A. Hogarth. "Electrical properties of barium-borosilicate glasses". Journal of Materials Science 26, n.º 23 (diciembre de 1991): 6271–74. http://dx.doi.org/10.1007/bf02387803.

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Kingnoi, Namthip, Jiratchaya Ayawanna y Nattapol Laorodphan. "Barium (Zinc) Borosilicate Sealing Glass and Joining Interface with YSZ Electrolyte and Crofer22APU Interconnect in SOFCs". Solid State Phenomena 283 (septiembre de 2018): 72–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.283.72.

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This work describes the performance of two glass-ceramic compositions, BaO-SiO2-B2O3 (Barium borosilicate glass: BaBS) and BaO-ZnO-SiO2-B2O3 (Barium zinc borosilicate glass: BaBS−Zn), used for joining YSZ ceramic electrolytes and Crofer22APU metallic interconnects in solid oxide fuel cells (SOFCs) working at 800°C for 50 h. ZnO had a negative effect on the thermal expansion coefficient (TEC) value of the BaBS-Zn glass-ceramic. XRD and SEM results revealed the formation of rod-shaped barium zinc silicate crystalline phases in the BaBS-Zn glass, which was accompanied by cracks and poor adherence at the YSZ/BaBS-Zn joint interface after working at 800°C for 50 h. The formation of cracks parallel to the interface between the Crofer22APU interconnect and the BaBS-Zn glass-ceramic sealant was observed due to the severe TEC mismatch. The BaBS glass–ceramic adhered well to the YSZ electrolyte as well as the pre-oxidized Crofer22APU without cracks. Chromium oxide scale developed between the pre-oxidized Crofer22APU/BaBS glass-ceramic joint interface with increasing the pre-oxidation temperature. This study shows that BaBS glass-ceramic is more effective than BaBS-Zn as a sealant for joining YSZ electrolytes and Crofer22APU metallic interconnects in SOFCs working at 800°C for 50 h.

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Savage, David, Jane E. Robbins y Richard J. Merriman. "Hydrothermal crystallization of a radioactive waste storage glass". Mineralogical Magazine 49, n.º 351 (abril de 1985): 195–201. http://dx.doi.org/10.1180/minmag.1985.049.351.06.

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AbstractA borosilicate glass, containing 25 wt. % of simulated high-level radioactive waste has been reacted with water at 350°C and 500 bars for 14 and 48 days using large-volume ‘cold-seal’ high-pressure equipment. Under these conditions the glass crystallizes a suite of mineral phases including: albite, NaAlSi3O8; aegirine, NaFeSi2O6; riebeckite, Na2Fe2(Fe,Mg)3Si8O22(OH)2; zektzerite, LiNaZrSi6O15; barium-strontium molybdate, (Ba,Sr)MoO4; stillwellite, (Nd,Ce,La)BSiO5; willemite, Zn2SiO4; smectite; a lithium-sodium borosilicate hydrate; melilite (åkermanite), Ca2MgSi2O7. A description of the morphology of these phases is given, together with a number of chemical analyses. The implications of the incorporation of waste species in these mineral phases to the disposal of high-level radioactive waste is discussed.

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Kavaz, E., F. I. El_Agawany, H. O. Tekin, U. Perişanoğlu y Y. S. Rammah. "Nuclear radiation shielding using barium borosilicate glass ceramics". Journal of Physics and Chemistry of Solids 142 (julio de 2020): 109437. http://dx.doi.org/10.1016/j.jpcs.2020.109437.

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Kumar, Vishal, O. P. Pandey y K. Singh. "Structural and optical properties of barium borosilicate glasses". Physica B: Condensed Matter 405, n.º 1 (enero de 2010): 204–7. http://dx.doi.org/10.1016/j.physb.2009.08.055.

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Mishra, R. K., V. Sudarsan, A. K. Tyagi, C. P. Kaushik, Kanwar Raj y S. K. Kulshreshtha. "Structural studies of ThO2 containing barium borosilicate glasses". Journal of Non-Crystalline Solids 352, n.º 28-29 (agosto de 2006): 2952–57. http://dx.doi.org/10.1016/j.jnoncrysol.2006.04.008.

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Mishra, R. K., P. U. Sastry, A. K. Tyagi, C. P. Kaushik y Kanwar Raj. "SAXS study of barium borosilicate glasses containing ThO2". Journal of Alloys and Compounds 466, n.º 1-2 (octubre de 2008): 543–45. http://dx.doi.org/10.1016/j.jallcom.2007.11.092.

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Yadav, Avadhesh Kumar, C. R. Gautam y Prabhakar Singh. "Crystallization and dielectric properties of Fe2O3 doped barium strontium titanate borosilicate glass". RSC Advances 5, n.º 4 (2015): 2819–26. http://dx.doi.org/10.1039/c4ra11301b.

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An attempt has been made to prepare barium strontium titanate borosilicate glasses in the system, 64[(Ba_1−xSr_x)·TiO₃]–30[2SiO₂·B₂O₃]–5[K₂O]–1[Fe₂O₃] (0.4 ≤ x ≤ 1.0), using the conventional melt-quench method.

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Tekin, Huseyin Ozan, Shamselden Abdelrasoul Mohamad Issa, Karem Abdel-Azeem Mahmoud, Fouad Ismail El-Agawany, Yasser Saad Rammah, Gulfem Susoy, Mohammed Sultan Al-Buriahi, Mohamed Mahmoud Abuzaid y Iskender Akkurt. "Nuclear radiation shielding competences of barium-reinforced borosilicate glasses". Emerging Materials Research 9, n.º 4 (1 de diciembre de 2020): 1131–44. http://dx.doi.org/10.1680/jemmr.20.00185.

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Wu, Jenn-Ming y Hong-Lin Huang. "Microwave properties of zinc, barium and lead borosilicate glasses". Journal of Non-Crystalline Solids 260, n.º 1-2 (diciembre de 1999): 116–24. http://dx.doi.org/10.1016/s0022-3093(99)00513-x.

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Más fuentes

Tesis sobre el tema "Borosilicates de baryum"

Bouteille, Barbara. "Séparation de phase dans les couches minces de verre pour la nanostructuration de surface". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS249.

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L'objectif de ces travaux est d'obtenir des nanostrcutures de tailles contrôlées en partant d'une couche de verre plane d'environ 100~nm, déposée par pulvérisation cathodique magnétron, ce grâce au phénomène de séparation de phase. Le système modèle utilisé est un borosilicate de baryum dont le ternaire possède une lacune d'immiscibilité large. Après démixtion, la phase riche en baryum possède d'une part un très bon contraste électronique pour des études MEB et d'autre part elle peut être dissoute préférentiellement afin de révéler des nanostrcutures. Trois types de morphologies ont pu être obtenues en maîtrisant la composition des couches minces : des trous, des plots ou une rugosité interconnectée. Le traitement d'images MEB et AFM permet de suivre quantitativement des grandeurs caractéristiques (tailles des objets et corrélations latérales). Ainsi la cinétique de mûrissement en milieu ultra-confiné est étudiée à la fois pour la nucléation-croissance et la décomposition spinodale. En particulier pour une assemblée de gouttes uniques dans l'épaisseur, le confinement ralenti la diffusion. Une loi de puissance plus lente que les modèles classiques est observée expérimentalement et numériquement. Pour un réseau 2D de filaments interconnectés, le mûrissement hydrodynamique est rapidement interrompu par fragmentation et déstabilise la surface engendrant directement une rugosité
This work aims at creating nanostrcutures which size can be controlled from a planar glass thin film of 100~nm deposited by reactive magnetron sputtering, thanks to phase separation phenomenon. The model ternary system used is a barium borosilicate because its immicibility domain is large. After demixing the barium rich phase has strong electronic contrast favorable for SEM imaging. Moreover this less polymerized phase can be selectively dissolved to reveal nanostructures. Three different morphologies are finally obtained varying thin films composition : holes, pillars or interconnected roughness. Image processing from SEM and AFM measurements allows quantitative measurements of characteristic lengths such as vertical and horizontal size and lateral correlations. Coarsening kinetics in ultra-confined media are studied for both mechanisms nucleation and growth and spinodal decomposition. Particularly, for droplets assembly with only one object into the thickness, confinement slows down diffusion. This impact is shown experimentally and numerically, it gives a power law slower than classical models. For 2D interconnected network, hydrodynamic growth is quickly interrupted by fragmentation and destabilises the free surface leading to rough samples

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Bouttes, David. "Micro-tomographie d’un borosilicate de baryum démixé : du mûrissement à la fragmentation". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066302/document.

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On utilise un verre de borosilicate de baryum comme système modèle pour étudier la séparation de phase dans les liquides. Plus spécifiquement, on considère le mûrissement dans le régime hydrodynamique visqueux, où la taille caractéristique des domaines évolue linéairement en temps : ∼ (γ/η)t, avec η la viscosité et γ la tension de surface. Le système est initialement bicontinu, ce qui est nécessaire pour ce régime de croissance.La morphologie des domaines est obtenue grâce à des expériences de microtomographie à rayons X in situ sur la ligne ID19 du synchrotron ESRF (European Synchrotron Radiation Facility). Des outils d’analyse d’image 3D spécialement développés pour l’étude permettent d’extraire des grandeurs d’intérêt. On a ainsi mesuré les volumes et les surfaces des domaines, les distributions de tailles de cordes, la caractéristique d’Euler et les courbures moyennes et gaussiennes locales. Ces grandeurs sont étudiées à travers le prisme de la loi d’échelle dynamique, qui prédit une croissance auto-similaire.Le système se sépare en deux phases ayant un contraste de viscosité très marqué (plusieurs ordres de grandeur). Le paramètre de contrôle essentiel est la fraction volumique de la phase la moins visqueuse. Lorsque cette phase moins visqueuse est minoritaire, elle se fragmente progressivement, jusqu’à arrêter la croissance. Cette fragmentation présente un caractère auto-similaire en raison de son couplage avec le mûrissement, ce qui génère des distributions de tailles de domaines larges, qu’on prédit sous la forme d’une loi puissance. Plus généralement, le mûrissement de la structure suit la loi d’échelle dynamique tant que la fragmentation reste marginale.On utilise un verre de borosilicate de baryum comme système modèle pour étudier la séparation de phase dans les liquides. Plus spécifiquement, on considère le mûrissement dans le régime hydrodynamique visqueux, où la taille caractéristique des domaines évolue linéairement en temps : ∼ (γ/η)t, avec η la viscosité et γ la tension de surface. Le système est initialement bicontinu, ce qui est nécessaire pour ce régime de croissance. La morphologie des domaines est obtenue grâce à des expériences de microtomographie à rayons X in situ sur la ligne ID19 du synchrotron ESRF (European Synchrotron Radiation Facility). Des outils d’analyse d’image 3D spécialement développés pour l’étude permettent d’extraire des grandeurs d’intérêt. On a ainsi mesuré les volumes et les surfaces des domaines, les distributions de tailles de cordes, la caractéristique d’Euler et les courbures moyennes et gaussiennes locales. Ces grandeurs sont étudiées à travers le prisme de la loi d’échelle dynamique, qui prédit une croissance auto-similaire.Le système se sépare en deux phases ayant un contraste de viscosité très marqué (plusieurs ordres de grandeur). Le paramètre de contrôle essentiel est la fraction volumique de la phase la moins visqueuse. Lorsque cette phase moins visqueuse est minoritaire, elle se fragmente progressivement, jusqu’à arrêter la croissance. Cette fragmentation présente un caractère auto-similaire en raison de son couplage avec le mûrissement, ce qui génère des distributions de tailles de domaines larges, qu’on prédit sous la forme d’une loi puissance. Plus généralement, le mûrissement de la structure suit la loi d’échelle dynamique tant que la fragmentation reste marginale
We use a barium borosilicate glass as a model system to study phase separation in liquids. We consider here the coarsening process in the viscous hydrodynamical regime, where the characteristic length scale grows linearly with time : ∼ (γ/η)t, with η the viscosity and γ the interfacial tension. The system is initially bicontinuous, which is mandatory for this growth regime.X-ray microtomography experiments are performed in situ at the ID19 beamline of the European Synchrotron Radiation Facility (ESRF) in order to obtain the morphology of the domains. We developed dedicated image processing routines for the analysis of the 3D images. We computed the volumes and surface areas of the domains, chord-length distributions, the Euler characteristic as well as local mean and Gaussian curvatures. Dynamic scaling hypothesis predicts a self-similar growth, which served as a basis for the discussion of these measurements. The glass separates in two phases with a very high viscosity contrast (several orders of magnitude). The main control parameter in our experiments is then the volume fraction of the less viscous phase. When this low-viscosity phase is the minority one, it undergoes a gradual fragmentation that eventually stops the coarsening. This fragmentation process bears self-similar features, which result in a wide distribution of domains sizes. We indeed predict a power-law distribution. More generally, we observed that the coarsening process follows the dynamic scaling hypothesis as long as fragmentation remains insignificant

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Holbrook, Chad M. "Topological Phases, Boson mode, Immiscibility window and Structural Groupings in Ba-Borate and Ba-Borosilicate glasses". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1447070374.

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Hsien, Cheng Chih y 鄭至先. "The Effect of Lithium Fluoride and Borosilicate Glass on the sintering and Dielectric Properties of Barium Titanate". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/85606358427280101932.

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碩士
國立臺灣大學
材料科學與工程學研究所
90
In the present study, two liquid-phase sintering aids, lithium fluoride (LiF) and a borosilicate glass were added into barium titanate to reduce its sintering temperature. The Ba/Ti ratio of the BaTiO3 powder was either higher or lower than unity. The effects of the liquid-phase sintering aids on the sintering behavior and dielectric properties of the BaTiO3 were investigated. The densification rate of barium titanate was significantly enhanced as the sintering temperature was raised above 842℃, the melting point of LiF. When the Ba/Ti ratio was higher than unity, the densification rates was much higher than that of the powder small Ba/Ti ratio. The addition of the borosilicate glass could also lower the sintering temperature of BaTiO3. However, the borosilicate glass reacted with BaTiO3 to form BaTiSiO5, Ba2TiSi2O8, BaTiSi3O9 and BaTi(BO3)2. The dielectric constant of the reaction phases was low so that dielectric property of sintered BaTiO3 was thus degraded.

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Libros sobre el tema "Borosilicates de baryum"

Performance evaluation of vitrified waste product based on barium-borosilicate matrix deployed for vitrification of sulphate bearing high level radioactive liquid waste. Mumbai: Bhabha Atomic Research Centre, 2004.

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Actas de conferencias sobre el tema "Borosilicates de baryum"

Halder, Rumu, Pranesh Sengupta, V. Sudarsan, C. P. Kaushik y G. K. Dey. "Investigating the effect of V2O5 addition on sodium barium borosilicate glasses". En DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4947837.

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Yao, Guanpeng, Shasha Li, Chun Li, Yanyan Zhou, Zhongmin Su y Fanming Zeng. "Study on Luminescence Properties of Eu³⁺/Tb³⁺ Doped Gadolinium Barium Borosilicate Glass". En 2021 13th International Conference on Advanced Infocomm Technology (ICAIT). IEEE, 2021. http://dx.doi.org/10.1109/icait52638.2021.9702087.

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Nageno, Y., Jae H. Kyung y N. M. Lawandy. "Efficient Photo-induced Second Harmonic Generation in Ternary Barium Borosilicate and Pure Binary Lead-silicate Glasses". En Photosensitivity and Quadratic Nonlinearity in Glass Waveguides. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/pqn.1995.sac.4.

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Most studies of photo-induced efficient second harmonic generation (SHG) in bulk glass systems are currently being performed with commercial glasses which are highly impure. The existence of impurities, even trace amounts, can significantly affect the photo-induced SHG characteristics in glasses as demonstrated in experiments performed on Ce-doped lead germanate glasses [1]. In fact, it was shown that Ce concentration as low as 0.2% was enough to cause a significant increase in SHG in these glasses. Therefore, it is advantageous to study glass systems that are devoid of impurities and consistent in composition in order to gain a better insight into the role of the glass matrix in photo-induced SHG. In a series of experiments performed by Dianov, et al [2], the effect of PbO concentration on SHG was studied using commercial lead-silicate glasses with different lead-oxide concentrations. They found a peaked correlation between lead concentration and SHG power at approximately 21 mol % PbO. However, the effects due to the presence of impurities and variations in composition in different lead-silicate glasses were not addressed. In this study, we measured compositional dependence on SHG characteristics on pure binary lead-silicate and pure ternary barium borosilicate glass systems.

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Driscoll, T. J. y N. M. Lawandy. "Nonexponential and non-ohmic thermal erasure of χ(2) gratings in borosilicate glass". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tub3.

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The mechanism by which a semipermanent effective χ(2) is encoded in centrosymmetric glass materials has remained a mystery for nearly a decade. It has been determined that the observed high conversion efficiencies result from a permanent, quasi-phase matching χ(2) grating established by a χ(3) mediated interaction with a frozen-in alternating dc field. We conducted thermal erasure studies of χ(2) gratings optically encoded in bulk samples of a high-barium low-alkali borosilicate glass (SK5, Schott Corp.) to determine the energy of trap sites responsible for the large fields (106 V/m). Q-switched mode-locked pulses at 1.064 μm and 532 nm were used to create effective χ(2) values of ~10–16 V/m in 1 cm thick samples. The thermal erasure rate of the χ(2) gratings, heated at 510,530,540, and 556 K, were dependent upon the initial grating amplitude indicative of a non-ohmic relaxation. In addition, the thermal decay of the gratings proved to be nonexponential and led to a value of a 1.9 ± 0.2 eV activation energy for the process at short times. Since only trace amounts of alkali metal ions are in the glass, the decay of the internal fields is likely to be due to electrons and or holes rather than ion migration. The nonexponential erasure behavior is addressed in terms of a dispersive transport mechanism for the thermally activated carriers.

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Jiang, L. y H. L. Tsai. "Ultrafast Photon-Electron Interactions in Dielectrics by a Single Laser Pulse". En ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59288.

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This study develops a quantum mechanical model to investigate energy absorption in ultrafast laser of dielectrics. The model investigates the optical property variations, electron temperature, and density changes at femtosecond scales. The ionizations and electron heating are two major factors considered for pulse absorption occurring within the pulse duration. The flux-doubling model is employed to calculate the free electron generation mainly through impact ionization and photoionization. The quantum mechanical treatments are used to account for the specific heat and the relaxation time for free electrons. The time and space dependent optical properties of the dense plasma generated by the ultrafast laser pulse are calculated. The predictions of ablation threshold and ablation depth of fused silica and barium aluminum borosilicate (BBS) are in good agreements with published experimental data. The model greatly improves the accuracy in predicting the ablation depth and can predict the crater shape.

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Driscoll, T. J. y N. M. Lawandy. "Fundamental and second harmonic dependence of the optical encoding of χ(2) gratings in borosilicate glasses". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tub5.

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An explanation for the ability to optically encode χ(2) gratings in centrosymmetric materials has eluded experimentalists and theorists for nearly a decade. Central to the problem is the creation of a large internal dc field (~106 V/m) that alternates with the periodicity necessary for quasi-phase matching. These fields are believed to couple to χ(3) of the media to create the χ(2) grating responsible for efficient frequency doubling. Q-switched mode-locked pulses at 1.064 μm and 532 nm were used to create χ(2) gratings in 1 cm thick samples of a high-barium low-alkali borosilicate glass (SK5, Schott Corp.). Preparation studies revealed an IR intensity threshold dependence of the order of gigiawatts per square centimeter. With the preparing IR intensity held constant at a value sufficiently above the IR threshold, we observed an exponential dependence in the optical encoding of effective χ(2) values versus the second harmonic intensity for writing values above 100 W/cm2. As the preparing green intensity is lowered, however, a sharp resonance is seen where the amplitude of the encoded grating is over 2 orders of magnitude above the value of the extrapolated exponential fit. This behavior has been observed at both room and liquid nitrogen temperatures.

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Ananthanarayanan, A., L. Montagne, B. Revel, G. P. Kothiyal, Dinesh K. Aswal y Anil K. Debnath. "Interaction Studies Between Crofer-22APU Alloy And P[sub 2]O[sub 5] Containing Barium Calcium Alumino-borosilicate (BCABS) Sealant Glass-Ceramics". En INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010). AIP, 2010. http://dx.doi.org/10.1063/1.3530549.

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