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Title: Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3
Authors: Zhou, QD
Saines, PJ
Sharma, N
Ting, J
Kennedy, BJ
Zhang, Z
Withers, RL
Wallwork, KS
Keywords: Crystal structure
Phase transformations
Electron diffraction
Orthorhombic lattices
Issue Date: 11-Nov-2008
Publisher: American Chemical Society
Citation: Zhou, Q. D., Saines, P. J., Sharma, N., Ting, J., Kennedy, B. H., Zhang, Z., Withers, R. L., & Wallwork, K. S. (2008). Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3. Chemistry of Materials, 20(21), 6666–6676. doi:10.1021/cm8014868
Abstract: The synthesis and structures of the perovskites Ln1/3TaO3 are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La → Cmmm/Ce−Gd → Pmma/Tb, Dy → Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm1/3TaO3 reveal this has a complex incommensurate structure. Likewise Gd1/3TaO3 appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd1/3TaO3 is thought to be due to the proximity to the first-order Cmmm−Pmma transition. Variable temperature studies show both Tb1/3TaO3 and Dy1/3TaO3 undergo a first-order Cmmm−Pmma transition upon heating. © 2008, American Chemical Society
Gov't Doc #: 2604
ISSN: 0897-4756
Appears in Collections:Journal Articles

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