期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 184, 期 2, 页码 252-263出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.09.031
关键词
Aurivillius; Synthesis; Structure
资金
- EPSRC
- NDA
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- EPSRC [EP/F055412/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F055412/1] Funding Source: researchfish
The n=4 Aurivillius phase, Bi5Ti3CrO15, was synthesised by solid state reaction. Rietveld analysis of high resolution neutron diffraction data demonstrated this material to adopt the polar space group A2(1)am at room temperature, transforming to the aristotype I4/mmm structure above 650 degrees C. This phase transition is coincident with an anomaly in DSC signal and relative permittivity, which are characteristic of a ferroelectric-paraelectric phase transition. Bi5Ti3CrO15 exhibits paramagnetic behaviour at low temperature, with short range antiferromagnetic interactions, but no evidence for long range magnetic ordering. This is considered a consequence of significant disorder of Ti and Cr over the available octahedral sites, as demonstrated by analysis of neutron diffraction data. (C) 2010 Elsevier Inc. All rights reserved.
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