UNSPECIFIED (2002) Investigation of a peculiar relaxor ferroelectric: Na0.5Bi0.5TiO3. In: 10th International Meeting on Ferroelectricity, SEP 03-07, 2001, MADRID, SPAIN.

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Abstract

The relaxor ferroelectric, Sodium Bismuth Titanate, (Na0.5Bi0.5TiO3), NBT is an A-site substituted distorted perovskite. An extensive temperature-, pressure- and substitution-dependent study of the crystal structure and phase transitions in this compound has been carried out using neutron/x-ray diffraction techniques. This has been complemented with optical, Raman and computational modelling studies. The temperature-dependent investigation shows that NBT undergoes a first phase transition from the high-temperature cubic prototype (Pm (3) over bar m) Phase I to Phase II of tetragonal symmetry (P4bm) and then a second one with strong diffuse character to Phase III of rhombohedral symmetry (R3c). The high-pressure study of NBT has revealed an interesting and unusual relaxor-to-antiferroelectric (R3c --> Pnma) phase transition. Structural variations as a function of temperature and doping across the (Na1-xKx)(0.5)Bi0.5TiO3 (NKBT) series have also been established.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Journal or Publication Title:	FERROELECTRICS
Publisher:	TAYLOR & FRANCIS LTD
ISSN:	0015-0193
Date:	2002
Volume:	270
Number of Pages:	6
Page Range:	pp. 1377-1382
Publication Status:	Published
Title of Event:	10th International Meeting on Ferroelectricity
Location of Event:	MADRID, SPAIN
Date(s) of Event:	SEP 03-07, 2001
URI:	http://wrap.warwick.ac.uk/id/eprint/10755

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