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Orthorhombic YBaCo 4 O 8.4 crystals as a result of saturation of hexagonal YBaCo 4 O 7 crystals with oxygen

Orthorhombic YBaCo 4 O 8.4 crystals as a result of saturation of hexagonal YBaCo 4 O 7 crystals... Abstract Hexagonal YBaCo4O7 crystals (sp. gr. P63 mc, a h = 6.3058(4) Å, c h = 10.2442(7) Å, Z = 2) are saturated with oxygen to the YBaCo4O8.4 composition and studied by X-ray diffraction (XRD) analysis. The saturation is completed by a structural first-order phase transition to orthorhombic crystals (sp. gr. Pbc21, a o = 31.8419(2) Å, b o = 10.9239(5) Å, c o = 10.0960(5) Å, Z = 20). The connection of two lattices is expressed in terms of the action of matrix (500/120/001) on the hexagonal basis. Five structural fragments of the same type but with different degrees of order alternate along the long axis of the oxygen-saturated orthorhombic structure. The XRD data on single crystals differ from the results obtained by other researchers on ceramic samples; possible causes of these differences are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Orthorhombic YBaCo 4 O 8.4 crystals as a result of saturation of hexagonal YBaCo 4 O 7 crystals with oxygen

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References (16)

Publisher
Springer Journals
Copyright
2015 Pleiades Publishing, Inc.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/S1063774515040161
Publisher site
See Article on Publisher Site

Abstract

Abstract Hexagonal YBaCo4O7 crystals (sp. gr. P63 mc, a h = 6.3058(4) Å, c h = 10.2442(7) Å, Z = 2) are saturated with oxygen to the YBaCo4O8.4 composition and studied by X-ray diffraction (XRD) analysis. The saturation is completed by a structural first-order phase transition to orthorhombic crystals (sp. gr. Pbc21, a o = 31.8419(2) Å, b o = 10.9239(5) Å, c o = 10.0960(5) Å, Z = 20). The connection of two lattices is expressed in terms of the action of matrix (500/120/001) on the hexagonal basis. Five structural fragments of the same type but with different degrees of order alternate along the long axis of the oxygen-saturated orthorhombic structure. The XRD data on single crystals differ from the results obtained by other researchers on ceramic samples; possible causes of these differences are discussed.

Journal

Crystallography ReportsSpringer Journals

Published: Jul 1, 2015

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