In-situ diffraction study of Ba sub(2)In sub(2)O sub(5)
In-situ neutron and X-ray diffraction experiments were used to determine the crystal structure of Ba sub(2)In sub(2)O sub(5) as related to temperature. Ba sub(2 )In sub(2)O sub(5) has a Brownmillerite-type crystal structure from room temperature to 900 degree C, consisting of an orthorhombic unit ce...
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Published in | Solid state ionics Vol. 149; no. 3-4; pp. 247 - 259 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
02.08.2002
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Online Access | Get full text |
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Summary: | In-situ neutron and X-ray diffraction experiments were used to determine the crystal structure of Ba sub(2)In sub(2)O sub(5) as related to temperature. Ba sub(2 )In sub(2)O sub(5) has a Brownmillerite-type crystal structure from room temperature to 900 degree C, consisting of an orthorhombic unit cell with lattice parameters 6.0864(3)x16.7903(7)x5.9697(3) A and Icmm (74) space group symmetry. At 900 degree C, oxygen vacancies begin to disorder. By 925 degree C, barium indate crystallizes in a tetragonal, 6.0348(4) x17.0688(22) A, unit cell with I4cm (108) space group symmetry. This oxygen vacancy order-disorder transition is associated with an evolution to fast oxide-ion conduction. At 1040 degree C, Ba sub(2)In sub(2)O sub(5) becomes a cubic oxygen-deficient perovskite, 4.2743(1) A, in the Pm3m space group. At 1080 degree C, Ba sub(2)In sub(2)O sub(5) begins to decompose. copyright 2002 Elsevier Science B.V. All rights reserved. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
ISSN: | 0167-2738 |