Crystal structures and phase transitions in Ba{sub 2}HoTaO{sub 6}

Journal Article · Mon Nov 05 23:00:00 EST 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.07.027· OSTI ID:21062243

Saines, Paul J ^[1]; Kubota, Yoshiki; Minakata, Chiharu; Hano, Hiroko ^[2]; Kato, Kenichi; Takata, Masaki ^[3]

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1. School of Chemistry, University of Sydney, Sydney, NSW, 2006 (Australia)
2. Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
3. RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan)

The structure of the cation-ordered double perovskite Ba{sub 2}HoTaO{sub 6} was examined using synchrotron X-ray powder diffraction at fine temperature intervals over the range of 90-300 K. Ba{sub 2}HoTaO{sub 6} has a cubic structure in space group Fm3-barm at room temperature. A proper ferroelastic phase transition to I4/m tetragonal symmetry occurs near approximately 260 K. Analysis of the spontaneous tetragonal strain versus temperature indicated that the phase transition is second order in nature.

• OSTI ID: 21062243
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
HOLMIUM COMPOUNDS
OXIDES
PEROVSKITE
PHASE TRANSFORMATIONS
SPACE GROUPS
STRAINS
SYNCHROTRONS
TANTALUM COMPOUNDS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION