期刊
CHEMISTRY OF MATERIALS
卷 20, 期 21, 页码 6666-6676出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm8014868
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资金
- Australian Research Council
- Australian Institute of Nuclear Science and Engineering (AINSE) through the provision of AINSE Postgraduate Awards
- Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities program
- SPring-8 Japan Synchrotron Radiation Research Institute (JASRI) [2007A1875]
The synthesis and structures of the perovskites Ln(1/3)TaO(3) 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 -> Pmc2(1)/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.
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