Crystal Structures and Phase Transitions in A-Site Deficient Perovskites Ln1/3TaO3
作者： Qingdi Zhou , Paul J. Saines , Neeraj Sharma , Jimmy Ting , Brendan J. Kennedy
DOI: 10.1021/CM8014868
关键词:
摘要: The synthesis and structures of the perovskites Ln1/3TaO3 are described. As size Ln cation is reduced, compounds display a sequence structure: P4/mmm/La → Cmmm/Ce−Gd Pmma/Tb, Dy Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns Tm1/3TaO3 reveal this has complex incommensurate structure. Likewise Gd1/3TaO3 appears metrically tetragonal, but synchrotron X-ray powder demonstrate actually orthorhombic. suppression spontaneous orthorhombic strain thought to be due proximity first-order Cmmm−Pmma transition. Variable temperature studies show both Tb1/3TaO3 Dy1/3TaO3 undergo transition upon heating.
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