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

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4917605· OSTI ID:22490199

Thangavelu, Karthik ^[1]; Rayaprol, S. ^[2]; Siruguri, V. ^[3]; Sastry, P. U.; Asthana, Saket

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1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, ODF-Campus-502205 (India)
2. UGC-DAE CSR Mumbai Centre, BARC Campus, Mumbai - 400085 (India)
3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400085 (India)

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}.

• OSTI ID: 22490199
• Journal Information: AIP Conference Proceedings, Vol. 1665, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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