Large structural modulations in the relaxor ferroelectric and intermediate state of strontium rich members (x>0.6) of the SrxBa1−xNb2O6 (sbn) solid solution series
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- 作者：H.A. Graetsch heribert.graetsch@rub.de
- 关键词：Strontium barium niobate ; Relaxor ferroelectric ; Incommensurate modulation ; Intermediate paraelectric state
- 刊名：Journal of Solid State Chemistry
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：246
- 期：Complete
- 页码：167-175
- 全文大小：5889 K
- 卷排序：246
文摘
The modulationed structures are refined for the whole composition range of sbn32–sbn82 in tetragonal and orthorhombic setting. The amplitudes of positional, occupational and adp modulations increase strongly with the strontium content. Evidence is presented that the sbn crystals are pseudo tetragonally twinned. The ferroelectric–intermediate paraelectric transition is not accompanied by a change of symmetry. Anomal adp of intermediate (non-ferroelectric) sbn82 indicate loss of coupling between off-center shifts of neighboring niobium.