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Title: Global and local structural variations near the antiferroelectric regime in Na{sub 0.5}Bi{sub 0.5}TiO{sub 3}

Rietveld refinement of neutron and x-ray diffraction data of Na{sub 0.5}Bi{sub 0.5}TiO{sub 3} shows R3c phase stabilization at room temperature. The intermediate antiferroelectric region between 180°C to 280°C exhibits phase coexistence i.e R3c + Pnma, along with decrease in octahedral tilt angle and increase in unit cell volume. The local structural changes observed from Raman scattering in the A-O, Ti-O and TiO{sub 6} phonon modes favor the global structural variation. A possible antiparallel cation displacement due to Pnma phase formation leads to the origin of antiferroelectric ordering in Na{sub 0.5}Bi{sub 0.5}TiO{sub 3}.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;
  1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, ODF-Campus-502205 (India)
  2. (India)
  3. UGC-DAE CSR Mumbai Centre, BARC Campus, Mumbai - 400085 (India)
  4. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400085 (India)
Publication Date:
OSTI Identifier:
22490199
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROELECTRIC MATERIALS; BISMUTH COMPOUNDS; ORTHORHOMBIC LATTICES; PHONONS; RAMAN EFFECT; RAMAN SPECTROSCOPY; SODIUM COMPOUNDS; STABILIZATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TITANATES; TITANIUM OXIDES; TRIGONAL LATTICES; VARIATIONS; X-RAY DIFFRACTION