Vacancy ordering and superstructure formation in dry and hydrated strontium tantalate perovskites: A TEM perspective |
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| Institution: | 1. Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalleen 21, Oslo NO-0349, Norway;2. SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway;3. Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde 4000, Denmark;1. Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;2. Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmhotz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany;1. Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Science and Engineering, Kyushu University, Kasuga 816-8580, Japan;2. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;3. Department of Engineering Science for Electronics and Materials, Faculty of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan;1. Instituto de Biociências, Universidade Federal de Mato Grosso, Av. Fernando Corrêa da Costa, n° 2367, Bairro Boa Esperança, Cuiabá, MT 78060-900, Brazil;2. Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia, Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Campus de Botucatu, Distrito de Rubião Junior, S/N, Botucatu, SP 18618-970, Brazil;1. Stuttgart Center for Electron Microscopy, Max Planck Institute for Intelligent Systems, Stuttgart, Germany;2. Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia;3. Korea Institute of Materials Science, Changwon, South Korea;1. CEA, LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France;2. CEA-INAC/UJF-Grenoble UMR-E, SP2M, LEMMA, Minatec, 38054 Grenoble, France;1. CNR-IENI Institute for Energetics and Interphases, Unit of Lecco, C.so Promessi Sposi 29, 23900 Lecco, Italy;2. Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;3. Department of Engineering Science for Electronics and Materials, Faculty of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan |
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| Abstract: | Crystal structures of Sr4(Sr2Ta2)O11 and Sr4(Sr1.92Ta2.08)O11.12, synthesized by solid state reaction technique in dry and hydrated state have been studied mainly using Transmission Electron Microscopy. Due to the lesser ability of X-rays to probe details in oxygen sublattice, the change in crystal symmetry due to ordering of oxygen vacancies could be detected better using Transmission Electron Microscopy. After detailed analysis through TEM, it was observed that no major change occurs in the cation sublattice. The TEM observations are compared with XRD data and discussed. The crystal symmetries and corresponding unit cells of all the perovskites based on the ordering of oxygen vacancies is deduced. Crystal unit cells based on the observations are proposed with ideal atomic coordinates. Finally an attempt is made to explain the water uptake behaviour of these perovskites based on the proposed crystal structure. |
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| Keywords: | TEM Crystal structure Perovskite Characterization |
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