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Title: Temperature dependent electrical transport characteristics of BaTiO{sub 3} modified lithium borate glasses

The glass samples with composition (70B{sub 2}O{sub 3}-29Li{sub 2}O-1Dy{sub 2}O{sub 3})-xBT; x = 0, 10 and 20 weight percent, have been prepared by conventional melt quench technique. The dielectric measurements as a function of temperature have been carried out on these samples in the frequency range 1 Hz-10 MHz. The dielectric relaxation characteristics of these samples have been studied by analyzing dielectric spectroscopy, dielectric loss, electric modulus formulation and electrical conductivity spectroscopy. It is found that the dielectric permittivity of the samples increases with an increase in the temperature and BT content. The frequency dependent ac conductivity has been analyzed using Jonscher’s universal power law whereas non exponential KWW function has been invoked to fit the experimental data of the imaginary part of the electric modulus. The values of the activation energy determined from the electric modulus and that from dc conductivity have been found to be quite close to each other suggesting that the same type of charge barriers are involved in the relaxation and the conduction mechanisms. The stretched exponent (β) and the power exponent (n) have been found to be temperature and composition dependent. The decrease in n with an increase in temperature further suggested that themore » ac conduction mechanism of the studied samples follows the correlated barrier hopping (CBH) model.« less
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, Guru Nanak Dev University, Amritsar 143005, Punjab (India)
  2. Thermodynamics Laboratory, UGC-DAE Consortium for Scientific Research, Indore 452001 (India)
Publication Date:
OSTI Identifier:
22492293
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; BORATES; CONCENTRATION RATIO; DIELECTRIC MATERIALS; DIFFUSION BARRIERS; DYSPROSIUM OXIDES; ELECTRIC CONDUCTIVITY; FREQUENCY DEPENDENCE; GLASS; LITHIUM COMPOUNDS; LITHIUM OXIDES; PERMITTIVITY; RELAXATION; TEMPERATURE DEPENDENCE; TITANATES