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|Title:||Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3.|
|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|
|Appears in Collections:||Journal Articles|
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