Investigation of a peculiar relaxor ferroelectric: Na0.5Bi0.5TiO3

Autor:	V. Jennings, Morten Andreas Geday, A. M. Glazer, G. O. Jones, Pam A. Thomas, Jens Kreisel
Rok vydání:	2002
Předmět:	Phase transition Materials science Bismuth titanate Crystal structure Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials Sodium bismuth titanate chemistry.chemical_compound Tetragonal crystal system Crystallography chemistry Phase (matter) Perovskite (structure)
Zdroj:	ResearcherID
ISSN:	1563-5112 0015-0193
Popis:	The relaxor ferroelectric, Sodium Bismuth Titanate, (Na 0.5 Bi 0.5 TiO 3 ), 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 &3macr; 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 M Pnma) phase transition. Structural variations as a function of temperature and doping across the (Na 1 m x K x ) 0.5 Bi 0.5 TiO 3 (NKBT) series have also been established.
Databáze:	OpenAIRE
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