skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Synthesis, structure and dielectric properties of a rare earth double perovskite oxide Ba{sub 2}CeTaO{sub 6}

Abstract

Highlights: {yields} A single phase Ba{sub 2}CeTaO{sub 6} (BCT) having monoclinic structure is synthesized. {yields} Impedance spectroscopy is applied to investigate the ac electrical properties of BCT. {yields} Complex impedance plane plots show grain contribution for BCT. {yields} The frequency dependent conductivity spectra follow the power law. -- Abstract: A rare earth double perovskite oxide barium cerium tantalate, Ba{sub 2}CeTaO{sub 6} (BCT) is synthesized by solid-state reaction. The X-ray diffraction pattern of the sample at room temperature (25 {sup o}C) shows monoclinic structure, with the lattice parameters, a = 9.78 A, b = 9.02 A and c = 4.27 A and {beta} = 93.8{sup o}. A scanning electron micrograph shows the formation of grains with average size {approx} 2 {mu}m. Impedance spectroscopy is applied to investigate the ac electrical properties of BCT in a temperature range from 303 to 673 K and in a frequency range from 100 Hz to 1 MHz. Complex-impedance-plane plots show grain contribution for BCT. The frequency-dependent electrical data are analyzed in the framework of the conductivity and modulus formalisms. The frequency-dependent conductivity spectra follow a power law. The conductivity at 110 Hz varies from 3.5 x 10{sup -7} S m{sup -1} to 1.2 x 10{supmore » -2} S m{sup -1} with increasing temperature from 303 to 673 K, respectively. The scaling behaviour of M'' and Z'' suggest that the relaxation describes the same mechanism at various temperatures.« less

Authors:
 [1];  [1]
  1. Department of Physics, Bose Institute, 93/1, Acharya Prafulla Chandra Road, Kolkata 700009 (India)
Publication Date:
OSTI Identifier:
22212232
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 46; Journal Issue: 9; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM; DIELECTRIC PROPERTIES; ELECTRON SCANNING; FREQUENCY DEPENDENCE; IONIC CONDUCTIVITY; LATTICE PARAMETERS; MONOCLINIC LATTICES; PEROVSKITE; SOLIDS; SPECTROSCOPY; SYNTHESIS; TETRAGONAL LATTICES; X-RAY DIFFRACTION

Citation Formats

Bharti, Chandrahas, E-mail: bharti_chandrahas@yahoo.com, and Sinha, T.P. Synthesis, structure and dielectric properties of a rare earth double perovskite oxide Ba{sub 2}CeTaO{sub 6}. United States: N. p., 2011. Web. doi:10.1016/J.MATERRESBULL.2011.05.007.
Bharti, Chandrahas, E-mail: bharti_chandrahas@yahoo.com, & Sinha, T.P. Synthesis, structure and dielectric properties of a rare earth double perovskite oxide Ba{sub 2}CeTaO{sub 6}. United States. doi:10.1016/J.MATERRESBULL.2011.05.007.
Bharti, Chandrahas, E-mail: bharti_chandrahas@yahoo.com, and Sinha, T.P. Thu . "Synthesis, structure and dielectric properties of a rare earth double perovskite oxide Ba{sub 2}CeTaO{sub 6}". United States. doi:10.1016/J.MATERRESBULL.2011.05.007.
@article{osti_22212232,
title = {Synthesis, structure and dielectric properties of a rare earth double perovskite oxide Ba{sub 2}CeTaO{sub 6}},
author = {Bharti, Chandrahas, E-mail: bharti_chandrahas@yahoo.com and Sinha, T.P.},
abstractNote = {Highlights: {yields} A single phase Ba{sub 2}CeTaO{sub 6} (BCT) having monoclinic structure is synthesized. {yields} Impedance spectroscopy is applied to investigate the ac electrical properties of BCT. {yields} Complex impedance plane plots show grain contribution for BCT. {yields} The frequency dependent conductivity spectra follow the power law. -- Abstract: A rare earth double perovskite oxide barium cerium tantalate, Ba{sub 2}CeTaO{sub 6} (BCT) is synthesized by solid-state reaction. The X-ray diffraction pattern of the sample at room temperature (25 {sup o}C) shows monoclinic structure, with the lattice parameters, a = 9.78 A, b = 9.02 A and c = 4.27 A and {beta} = 93.8{sup o}. A scanning electron micrograph shows the formation of grains with average size {approx} 2 {mu}m. Impedance spectroscopy is applied to investigate the ac electrical properties of BCT in a temperature range from 303 to 673 K and in a frequency range from 100 Hz to 1 MHz. Complex-impedance-plane plots show grain contribution for BCT. The frequency-dependent electrical data are analyzed in the framework of the conductivity and modulus formalisms. The frequency-dependent conductivity spectra follow a power law. The conductivity at 110 Hz varies from 3.5 x 10{sup -7} S m{sup -1} to 1.2 x 10{sup -2} S m{sup -1} with increasing temperature from 303 to 673 K, respectively. The scaling behaviour of M'' and Z'' suggest that the relaxation describes the same mechanism at various temperatures.},
doi = {10.1016/J.MATERRESBULL.2011.05.007},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 9,
volume = 46,
place = {United States},
year = {2011},
month = {9}
}