Gotowe bibliografie tematyczne / Pyrochlore structure

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Gotowa bibliografia na temat „Pyrochlore structure”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Pyrochlore structure"

Parshukova, K. N., E. P. Rylchenko, V. A. Muraviev, et al. "SYNTHESIS OF MULTICOMPONENT COMPOUNDS WITH A PIROCHLORE-TYPE STRUCTURE." Steklo i Keramika, no. 10 (October 2022): 34–39. http://dx.doi.org/10.14489/glc.2022.10.pp.034-039.

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The possibility of solid-phase synthesis of multicomponent bismuth niobates and tantalates with pyrochlore-type structure (sp. gr. Fd-3m), containing atoms of transition 3d-elements in equimolar quantities is shown. The composition of this type pyrochlores can be described by stoichiometric formula Bi2Cr1/6Mn1/6Fe1/6Co1/6Ni1/6Cu1/6Ta(Nb)2O9 ± ?. A feature of synthesis of pyrochlores is a multi-stage high-temperature heat treatment process at a temperature of 650, 850, 950, 1050 °С for 60 hours. In the case of bismuth tantalate based pyrochlore, impurity phase of triclinic bismuth orthotantalat

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Rushton, M. J. D., Robin W. Grimes, C. R. Stanek, and Scott Owens. "Predicted pyrochlore to fluorite disorder temperature for A2Zr2O7 compositions." Journal of Materials Research 19, no. 6 (2004): 1603–4. http://dx.doi.org/10.1557/jmr.2004.0231.

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In a previous publication the order–disorder pyrochlore to fluorite transformation temperatures for a series of A2Hf2O7 pyrochlores were predicted [C.R. Stanek and R.W. Grimes: Prediction of rare-earth A2Hf2O7 pyrochlore phases. J. Am. Ceram. Soc. 2002, 85, p. 2139]. This was facilitated by establishing a relationship between these temperatures and the energy required to introduce a specific defect structure into the perfect pyrochlore lattice. Here an equivalent relationship for A2Zr2O7 pyrochlores was generated, and from this the disorder temperatures for a number of compositions including E

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Livshits, Tatiana, Sergey Yudintsev, Sergey V. Stefanovsky, and Rodney Charles Ewing. "New Actinide Waste Forms with Pyrochlore and Garnet Structures." Advances in Science and Technology 73 (October 2010): 142–47. http://dx.doi.org/10.4028/www.scientific.net/ast.73.142.

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Cubic oxides with pyrochlore and garnet structures are promising matrices for long-lived actinides immobilization. Their isomorphic capacity with respect to An and REE was determined. To predict the long-term behavior of these matrices under their underground disposal radiation stability of synthetic pyrochlores and garnets was studied. Most of titanate phases have the critical (amorphization) doses close to 0.2 displacements per atom at 298 K. This value is significantly higher for Sn- and Zr-rich pyrochlores. Corrosion behavior of the pyrochlore- and garnet-composed matrices was investigated

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Wang, Yuhao, Chong Jing, Zhao-Ying Ding, et al. "The Structure, Property, and Ion Irradiation Effects of Pyrochlores: A Comprehensive Review." Crystals 13, no. 1 (2023): 143. http://dx.doi.org/10.3390/cryst13010143.

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Since the beginning of the use of nuclear energy, humans have been faced with the problem of radionuclide disposal. At present, a large amount of waste is stored in pools or dry tanks at reactor sites. With the development of the nuclear power generation industry worldwide, the high storage cost (including building, maintaining, and operating storage pools) is overwhelming and serious, and urgent radionuclide disposal problems have become increasingly difficult. Safe and economical strategies are urgently needed for long-term storage and disposal of nuclear waste, which has become among the co

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Khanvilkar, M. B., A. K. Nikumbh, S. M. Patange, et al. "Structural, electrical and magnetic properties of substituted pyrochlore oxide nanoparticles synthesized by the co-precipitation method." Physics and Chemistry of Solid State 22, no. 2 (2021): 353–71. http://dx.doi.org/10.15330/pcss.22.2.353-371.

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Five substituted pyrochlore nanooxides such as Nd1.9Ho0.1Zr1.8Ce0.2O7, La1.95Ce0.05Zr0.29Ce1.71O7, Y1.79Pr0.21Ru1.99Pr0.01O7, Dy1.9Yb0.1Mn1.93Cu0.07O7 and Dy1.99Sr0.01Sn2O7 were synthesized by coprecipitation method. These precursors were monitored by thermal studies (TGA-DTA). The prepared nanosized substituted pyrochlore oxides were characterized by EDS, XRD, SEM, TEM, d. c. electrical conductivity, Thermoelectric power, Hall effect measurement, dielectric properties and magnetization measurements. XRD confirmed the formation of a single phase crystalline substituted pyrochlores with a cubic

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Petrakov, A. P., K. A. Badanina, A. A. Selyutin та ін. "Research of the properties of a complex oxide Bi2Co1/3Cu1/3Ni1/3Nb2O9+Δ with a pyrochlore structure". Industrial laboratory. Diagnostics of materials 91, № 5 (2025): 38–44. https://doi.org/10.26896/1028-6861-2025-91-5-38-44.

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Bismuth-containing monodoped pyrochlores have promising photocatalytic and dielectric properties. The paper presents the results of studying the properties of multielement pyrochlore containing transition 3d-elements in equivalent amounts. Mixed oxide pyrochlore of the composition Bi2Co1/3Cu1/3Ni1/3Nb2O9+Δ (sp. gr. Fd-3m, a = 10.5378 ± 6 Å) was synthesized by the solid-phase reaction method. The chemical state of transition element cations in the oxide pyrochlore was estimated by X-ray photoelectron spectroscopy (XPS). The parameters of the Bi5d, Nb3d, Co2p, Ni2p, Cu2p XPS spectra for the mixe

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Zhuk, Nadezhda A., Sergey V. Nekipelov, Olga V. Petrova, et al. "Synthesis, Phase Formation, and Raman Spectroscopy of Ni and Zn(Mg) Codoped Bismuth Stibate Pyrochlore." Chemistry 7, no. 4 (2025): 110. https://doi.org/10.3390/chemistry7040110.

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Complex antimony pyrochlores Bi2.7M0.46Ni0.70Sb2O10+Δ (M = Zn, Mg) were synthesized from oxide precursors, using the solid-state reaction method. For each composition variant, the pyrochlore phase formation process was studied during solid-state synthesis in the range of 500–1050 °C. The influence of zinc and magnesium on the phase formation process was established. The interaction of oxide precursors occurs at a temperature of 600 °C and higher, resulting in the formation of bismuth stibate (Bi3SbO7) as a binary impurity phase. Oxide precursors, including bismuth(III) and antimony(III,V) oxid

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Tan, Phei, Kar Tan, Chwin Khaw, et al. "Substituted Bi3.5Mg1.8Nb2.7O13.8 pyrochlores with transition metals (Zn, Ni and Cd): Doping mechanism, structure and electrical properties." Processing and Application of Ceramics 18, no. 3 (2024): 281–89. http://dx.doi.org/10.2298/pac2403281t.

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The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the difference in their ionic radii, Cd was postulated to substitute Mg at the eight-fold coordinated A-site whereas Zn and Ni were to replace Mg at the six-fold coordinated B-sites of the host structure. Solubility limits in these substitutional pyrochlore solid solutions were determined to be 0.4, 0.1 and 0.3 for Zn, Ni and Cd, respectively. Upon introducing these divalent cation dopants, notable changes in the lattice parameters and grain size

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Zhou, Haidong, and Christopher Wiebe. "High-Pressure Routes to New Pyrochlores and Novel Magnetism." Inorganics 7, no. 4 (2019): 49. http://dx.doi.org/10.3390/inorganics7040049.

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The pyrochlore structure (A2B2O7) has been an object of consistent study by materials scientists largely due to the stability of the cubic lattice with respect to a wide variety of chemical species on the A or B sites. The criterion for stability under ambient conditions is controlled by the ratio of these cations, which is empirically 1.36 < RA/RB < 1.71. However, under applied pressure synthesis conditions, the pyrochlore lattice is stable up to RA/RB ∼ 2.30, opening up possibilities for new compounds. In this review, we will highlight recent work in exploring new rare-earth pyrochlore

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Xue, Yuan, Ningyue Sun, and Guowu Li. "Evolution of Nb–Ta Oxide Minerals and Their Relationship to the Magmatic-Hydrothermal Processes of the Nb–Ta Mineralized Syenitic Dikes in the Panxi Region, SW China." Minerals 11, no. 11 (2021): 1204. http://dx.doi.org/10.3390/min11111204.

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Previous geochemical and petrological studies have concluded that initially magmatic Nb–Ta mineralization is often modified by post-magmatic hydrothermal fluids; however, there is still a lack of mineralogical evidence for the syenite-related Nb–Ta deposit. From the perspective of Nb–Ta minerals, the pyrochlore supergroup minerals have significance for indicating the fluid evolution of alkaline rock or related carbonatite type Nb–Ta deposits. The Panzhihua–Xichang (Panxi) region is a famous polymetallic metallogenic belt in southwestern China, abound with a huge amount of Nb–Ta mineralized sye

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Rozprawy doktorskie na temat "Pyrochlore structure"

Mostaed, Ali. "Atomic structure study of pyrochlore ytterbium titanate." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/96357/.

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There has been great interest in the magnetic behaviour of pyrochlore oxides with the general formula A2B2O7, in which rare-earth (A), and transition metal (B) cations are ordered on separate interpenetrating lattices of corner-sharing tetrahedra. Such materials exhibit behaviours including quantum spin-ice, (quantum) spin-liquid, and ordered magnetic ground states. Yb2Ti2O7 lies on the boundary between a number of competing magnetic ground states. Features in the low-temperature specific heat capacity that vary in sharpness and temperature from sample to sample suggest that in some cases the

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Galati, Rosa. "Synthesis, structure and properties of heavy metal pyrochlore oxides." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/173963/.

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Many interesting and often exotic magnetic phenomena have been observed over the past twenty years in the family of the heavy metal pyrochlore oxides, A2B2O6O’. In these systems, competing interactions are common and tend to emerge mainly at low temperatures. Magnetic properties are related to the contribution of d orbitals that transition metal (TM) offer and their interplay with the positive contribution coming from the cation sitting on the A site. The work described in this thesis explores the effects of chemical substitution of the A site cation on the symmetry and the properties of a num

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Rivière, Martine. "Synthèse, structure et propriétés de conducteurs protoniques de type pyrochlore." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600815m.

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Walker, Robert. "The surface chemistry and bulk electronic structure of bismuth based pyrochlore oxides." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48468.

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Metal oxides of bismuth show applications from photocatalysts to dielectric materials often due to the influence of the so called “lone pair” electrons that give rise to structural distortions and modified electronic structure. These effects upon which fundamental properties are derived are still not yet fully understood. Polycrystalline Bi 2 Ti 2 O 7 , Bi 2 Zr 2 O 7 , and Bi 2 Hf 2 O 7 materials - the latter in both pyrochlore (p) and monoclinic (m) phases - were prepared via co-precipitation and, except for Bi 2 Hf 2 O 7 (m), thin films. The bulk, surface, and electronic properties were char

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Tolla, Bruno. "Phénomènes d'échange d'oxygène au sein de nouveaux stannates de cérium de structure pyrochlore : défauts et mécanismes." Bordeaux 1, 1999. http://www.theses.fr/1999BOR10583.

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Ce travail concerne l'etude des proprietes d'echange d'oxygene de la solution solide pyrochlore ce 2sn 2o 7-ce 2sn 2o 8. La synthese d'un nouveau stannate ce 2sn 2o 7, ou le cerium est au degre d'oxydation iii, a ete mise au point. Sa structure a ete determinee par diffraction de neutrons. Ce compose est susceptible d'intercaler des 400\c un atome d'oxygene par unite formulaire. Une experience de diffraction de neutrons, completee par des mesures de spectroscopie a l'echelle locale (ir/raman, exafs, rmn 1 1 9sn/ 1 7o), permet de caracteriser deux types de defauts au sein du nouveau reseau qui

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Thuries, Fabienne. "Préparation et étude cristallographique de niobates et tantalates de plomb à structure dérivée de la phase pyrochlore." Aix-Marseille 3, 1995. http://www.theses.fr/1995AIX30016.

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Au cours de ce travail, nous avons identifie les oxydes obtenus avec les cristaux de pb#2sctao#6 (pst) et pb#2sc(nb#0#,#5ta#0#,#5)o#6 qui sont etudies pour leurs proprietes dielectriques. Ce sont des tantalates de plomb contenant une proportion en scandium tres inferieure a celle de pst et presentant une structure cubique de type pyrochlore. Dans un deuxieme temps, nous avons elabore des cristaux de niobate et tantalate de plomb, a partir des compositions: 2pbo-1nb#2o#5 et 2pbo-1ta#2o#5. Il s'avere que les phases obtenues ne sont pas stchiometriques et presentent un exces de plomb par rapport

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Lutique, Stéphanie. "Etude de zirconates de structure pyrochlore en tant que matrice pour la transmutation ou le conditionnement des actinides mineurs." Paris 11, 2003. http://www.theses.fr/2003PA112080.

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La loi "Bataille" définit le cadre des études pour une gestion optimisée des déchets nucléaires, incluant la séparation des éléments les plus radiotoxiques pour les transmuter en élément moins radiotoxiques ou les stocker à long terme. Ces deux applications nécessitent l'utilisation d'une matrice répondant à plusieurs critères spécifiques. Ce travail effectué au cours de la thèse a pour but d'étudier une matrice potentielle pour la transmutation ou le stockage des actinides après leur séparation: le zirconate de type pyrochlore A2Zr2O7 (A est un lanthanide ou un actinide). Le développement d'u

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Roger, Anne-Cécile. "Couplage oxydant du methane sur des catalyseurs de structure definie de type pyrochlore a#2b#2o#7 (a = sm ; b = sn)." Université Louis Pasteur (Strasbourg) (1971-2008), 1995. http://www.theses.fr/1995STR13058.

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Ce travail porte sur la preparation d'une famille de structures definies derivant de la pyrochlore sm#2sn#2o#7 et sur le comportement catalytique de ces structures vis a vis de la reaction de couplage oxydant du methane. La maitrise et la reproductibilite de la synthese, par une methode de type sol-gel (methode des resines), ont ete atteintes par une etude approfondie des especes intermediaires de la preparation. La solubilisation des sels cationiques (samarium et etain) dans l'acide propionique a ete suivie par infra-rouge et rmn de #1#1#9sn. Ces etudes ont permis de proposer des modeles pour

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Rivière, Martine. "Synthèse, structure et propriétés de conducteurs protoniques de type pyrochlore : la série H2xSb2xW2-2xo6h2o et la phase Al2[(OH)0,5F0,5]6.H2O." Le Mans, 1986. http://www.theses.fr/1986LEMA1009.

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Obtention des phases du titre par chimie douce. Localisation des molecules d'eau par diffraction rx et diffraction de neutrons. Les mesures de conductivite electrique effec tuees par la methode des impedances complexes dans des atmospheres a humidite controlee revelent l'influence tres importante de l'eau physiquement absorbee

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Andrade, M. B., H. Yang, D. Atencio, et al. "Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil." MINERALOGICAL SOC, 2017. http://hdl.handle.net/10150/625066.

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Hydroxycalciomicrolite, Ca1.5Ta2O6(OH) is a new microlite-group mineral found in the Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. It occurs as isolated octahedral and as a combination of octahedral and rhombic dodecahedral crystals, up to 1.5 mm in size. The crystals are yellow and translucent, with a white streak and vitreous to resinous lustre. The mineral is brittle, with a Mohs hardness of 56. Cleavage is not observed and fracture is conchoidal. The calculated density is 6.176 g cm(3). Hydroxycalciomicrolite is isotropic, n(calc). = 2.010. The infrared and Raman spectra exhibit

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Książki na temat "Pyrochlore structure"

Fukina, Diana G., Artem S. Belousov, and Evgeny V. Suleimanov. Pyrochlore Oxides: Structure, Properties, and Potential in Photocatalytic Applications. Springer, 2023.

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Części książek na temat "Pyrochlore structure"

Belousov, A. S., and D. G. Fukina. "Application of Compounds with Pyrochlore Structure in Photocatalysis." In Green Chemistry and Sustainable Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46764-6_4.

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Kumari, Sushama, S. K. Sharma, Pawan K. Kulriya, Vinod Singh, and Swati Bugalia. "Conductivity and Structure Correlation in Gd2Zr2O7 Pyrochlore for Oxide Fuel Cell Technology." In Springer Proceedings in Physics. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7691-8_21.

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Krivovichev, Sergey V., Vadim S. Urusov, Sergey V. Yudintsev, Sergey V. Stefanovsky, Oksana V. Karimova, and Natalia N. Organova. "Crystal Structure of Murataite Mu-5, a Member of the Murataite-Pyrochlore Polysomatic Series." In Minerals as Advanced Materials II. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20018-2_28.

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Smirnov, V. F., O. N. Smirnova, N. A. Anikina, and A. Yu Shishkin. "Antimicrobial Effect of Nano- and Sub-micron Particles of Metal Oxides with β-Pyrochlore Structure." In Green Chemistry and Sustainable Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46764-6_6.

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Xu, Qiang, Wei Pan, Chun Lei Wan, Long Hao Qi, He Zhuo Miao, and Fu Chi Wang. "A Promising LaSmZr₂O₇ Ceramic with Pyrochlore Structure for Thermal Barrier Coatings." In High-Performance Ceramics V. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1328.

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Hashizume, Takashi, Atsushi Saiki, and Shogo Miwa. "Crystal Structure of the Defect Pyrochlore Potassium Tantalate on Ion-Exchanging Dipping in Sodium Aqueous Solution by Rietveld Analysis." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119494096.ch14.

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Fukina, D. G., and E. V. Suleimanov. "Structural Type of α-Pyrochlore Oxides." In Green Chemistry and Sustainable Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46764-6_1.

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Fukina, D. G., and E. V. Suleimanov. "Structural Type of β-Pyrochlore Oxides AM2O6." In Green Chemistry and Sustainable Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46764-6_2.

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Raveau, B. "A2 M7 O18 Structure and Intergrowths with Pyrochlores." In Inorganic Reactions and Methods. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145326.ch124.

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Matsuda, C. K., R. Barco, P. Sharma, et al. "Iron-containing pyrochlores: structural and magnetic characterization." In LACAME 2006. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-85559-0_9.

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Streszczenia konferencji na temat "Pyrochlore structure"

Lian, J., R. C. Ewing, S. V. Yudintsev, and S. V. Stefanovsky. "Radiation Stability of Melted Titanate Waste Forms for Actinide Immobilization." In ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1316.

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Abstract Radiation stability of titanate ceramics suggested for actinide-bearing waste immobilization was studied. The major actinide (uranium) hosts in the samples prepared by melting followed by crystallization in a resistive furnace and in a cold crucible are phases with fluorite-related structure (zirconolite, pyrochlore, murataite) as well as brannerite. Critical amorphization doses at room temperature for these phases irradiated with 1 MeV Kr+ ions were (× 1018 ions/m2) ∼3, 1.8–2.4, 1.7–1.9, and 1.4 for zirconolite, pyrochlore, murataite, and brannerite, respectively. Murataite varieties

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Tao, S., J. Yu, H. Zhao, X. Zhou, and C. Ding. "High Temperature Aging Behavior and Order-Disorder Transformation of Plasma Sprayed Sm2Zr2O7 Coatings." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, et al. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0236.

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Abstract Rare-earth zirconates with a pyrochlore structure have attracted great attention for potential application in thermal barrier coatings to further improve the performance and durability of gas turbines. In present work, the Sm2Zr2O7 coating was deposited by air plasma spraying technology, and its microstructure and phase composition were examined. The as-sprayed Sm2Zr2O7 coating exhibited anion-disordered while cation-ordered fluorite-type structure. Degree of ordering was considerable enhanced after high temperature aging, and transformed to ordered pyrochlore-type structure after the

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Cioatera, N., E. A. Voinea, C. I. Radu, and C. I. Spinu. "Influence of cerium dopant on pyrochlore structure evolution under highly reducing atmosphere." In 2015 International Semiconductor Conference (CAS). IEEE, 2015. http://dx.doi.org/10.1109/smicnd.2015.7355169.

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Xu, Huifang. "Intergrowth Structure in U- and Hf-Bearing Pyrochlore and Zirconolite: Analytical Electron Microscopy Investigation." In PLUTONIUM FUTURES - THE SCIENCE: Third Topical Conference on Plutonium and Actinides. AIP, 2003. http://dx.doi.org/10.1063/1.1594614.

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Smith, Mark W., David A. Berry, Dushyant Shekhawat, and Daniel J. Haynes. "Catalytic Material Development for a SOFC Reforming System: Application of an Oxidative Steam Reforming Catalyst to a Monolithic Reactor." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33198.

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The main objective of this work was to develop fuel reforming technologies to produce a H2-rich synthesis gas to power a solid oxide fuel cell being developed by US DOE for applications like diesel auxiliary power units. In order to accomplish this objective the following efforts were required: 1) examination of the effect of oxygen-conducting supports on reforming catalyst performance, 2) demonstration of the long-term stability under reforming conditions of an oxide powder catalyst deposited onto an oxygen-conducting support, 3) fabrication of a catalyst system by depositing the active catal

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Korniienko, Oksana, Sergey Korichev, Anatoliy Sameljuk, Hanna Barchevska, and Irina Subbota. "Phase Relation of the ZrO2–HfO2–La2O3 System at 1500-1100 °C." In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-ok9460.

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Complex oxides such as the rare-earth zirconate and hafnate ceramic materials in the fluorite-type (space group Fm3m) and/or pyrochlore-type structure (space group Fd-3m) display a variety of interesting and promising physical, chemical, thermal and magnetic properties which render them excellent candidates in applications such as thermal barrier coatings, solid electrolytes, materials for nuclear industry, and are of interest as luminescent materials, scintillators for applications in radiation detectors and others. The phase diagrams of multicomponent systems are the theoretical basis for th

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Stöver, D., G. Pracht, H. Lehmann, M. Dietrich, J. E. Döring, and R. Vaßen. "New Material Concepts for the Next Generation of Plasma-Sprayed Thermal Barrier Coatings." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1455.

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Abstract For the application as a thermal barrier coating (TBC) the partially stabilized zirconia approaches some limits of performance, which hardly can be overcome in the near future. To further enhance the efficiency of gas turbines, higher temperature and a longer lifetime of the coating are needed for the next generation of TBC´s. This paper presents the development of new materials and concepts for application as TBC. Materials such as compositions with pyrochlore structure or doped zirconias are compared with new concepts like nanolayer between top- and bondcoat, metal-glass composites

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Vaßen, R., X. Cao, F. Tietz, G. Kerkhoff, and D. Stöver. "La2Zr2O7 – A New Candidate for Thermal Barrier Coatings." In ITSC 1999, edited by E. Lugscheider and P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0830.

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Abstract Yttrium oxide-stabilized zirconium dioxide is mainly used in thermal barrier coatings. However, the desired higher gas inlet temperatures have initiated the search for novel materials. Low thermal conductivity and high melting points are important criteria for the selection of these materials. This paper investigates a zirconate material with a pyrochlore structure and a high melting point. In addition, it investigates the sintering behavior of the coatings at elevated temperatures. Dilatometer tests are carried out at 1200 deg C for at least 70 hours. For samples which had been annea

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Mauer, G., D. Sebold, R. Vaßen, and D. Stöver. "Improving Atmospheric Plasma Spraying of Zirconate Thermal Barrier Coatings based on Particle Diagnostics." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, et al. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0561.

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Abstract Lanthanum zirconate (La2Zr2O7) was proposed as a promising material for thermal barrier coatings. At atmospheric plasma spraying (APS) of La2Zr2O7 a considerable amount of La2O3 can evaporate in the plasma flame, resulting in a non-stoichiometric coating. As indicated in the phase diagram of the La2O3-ZrO2 system, in the composition range of pyrochlore structure, the stoichiometric La2Zr2O7 has the highest melting point and other compositions are eutectic. APS experiments were performed with a TriplexPro-200 plasma torch at different power levels to achieve different degrees of evapor

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Cheng, B., G. J. Yang, Q. Zhang, et al. "Thermal Gradient Cyclic Lifetime of La2Zr2O7/YSZ Double Ceramic Layer Thermal Barrier Coatings with Equivalent Thermal Insulation Performance." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, et al. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0843.

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Abstract Thermal insulation performance is a measurement of the thermal protection offered by the thermal barrier coatings (TBCs) to the substrate, therefore, it is essentially important to compare different double ceramic layer (DCL) TBCs on the premise of the same thermal resistance. In this study, a series of LZO/YSZ DCL-TBCs, with the equivalent thermal insulation to 500 µm thick YSZ TBCs, were prepared, and their lifetimes were evaluated by thermal gradient cyclic test at the top coat surface temperature of 1300°C. Result show that, the lifetime of DCL-TBCs was more than doubled compared

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Raporty organizacyjne na temat "Pyrochlore structure"

Tuller, H. L. Structural disorder and transport in ternary oxides with the pyrochlore structure. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6237884.

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Tuller, Harry L. Structural disorder and transport in ternary oxides with the pyrochlore structure. Final report. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/771370.

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Lumpkin, G. R., R. C. Ewing, and E. M. Foltyn. Thermal recrystallization of alpha-recoil damaged minerals of the pyrochlore structure type. Office of Scientific and Technical Information (OSTI), 1985. http://dx.doi.org/10.2172/437684.

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