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Title: Structural and dielectric properties of Ba{sub 2}LaSbO{sub 6} ceramics

The ceramic Ba{sub 2}LaSbO{sub 6} (BLS) is synthesized by the solid state reaction technique. The Rietveld refinement of X-ray diffraction pattern at room temperature shows Monoclinic P2{sub 1}/n space group symmetry with lattice parameter a = 6.0720 (0) Å, b = 6.1058 (3) Å, c = 8.6016 (6) Å and β =89.7091 ° (8). Dielectric study of sample has been performed in the temperature range from 30 °C to 300 °C in the frequency range 50 Hz to 1.1 MHz. Dielectric relaxation peaks are observed in the imaginary part of complex permittivity of the spectra. The frequency dependence of real and imaginary parts of dielectric permittivity is analyzed using Cole-Cole model. The temperature dependent relaxation time is found to obey the Arrhenius law having activation energy 0.48 eV which indicates that the conduction mechanism in the materials may be due to polaron hopping based on electron carriers. The complex plane plots of BLS shows the presence of both grain and grain boundary effects. Conductivity spectra follow the power law.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Department of Chemistry, Government Postgraduate College Lansdowne, Pauri-Garhwal-246139, India and Department of Physics, T. M. Bhagalpur University Bhagalpur-812007 (India)
  2. Department of Physics, Bose Institute, 93/1 A. P. C. Road, Kolkata-700009 (India)
  3. Department of Physics, T. M. Bhagalpur University Bhagalpur-812007 (India)
Publication Date:
OSTI Identifier:
22269295
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; CERAMICS; DIELECTRIC MATERIALS; FREQUENCY DEPENDENCE; GRAIN BOUNDARIES; LATTICE PARAMETERS; MONOCLINIC LATTICES; PERMITTIVITY; RELAXATION TIME; SOLIDS; SPACE GROUPS; SPECTRA; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION