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Title: Field dependent dielectric behaviour of BaxSr₁₋XTiO₃ perovskites
Authors: Kukreti, Ashish
Kumar, Ashok
Naithani, U C
Keywords: Dielectrics;BaxSr₁₋xTiO₃ perovskites;Green’s functions.
Issue Date: Apr-2008
Publisher: CSIR
Abstract: Using the method of double time thermal Green’s functions and Kubo formalism, a general expression has been derived for the electric field dependence of the complex dielectric constant of BaxSr₁₋xTiO₃ ferroelectric crystal in the paraelectric phase from the Silverman–Joseph Hamiltonian augmented with fourth order phonon co-ordinates. The change of mass as well as harmonic force constant between impurity atom and host lattice atoms are taken into account. The frequency, temperature and electric field dependent dielectric constant of BaxSr₁₋xTiO₃ crystal has been discussed. Dielectric constant increases with increase of applied field. The results are compared with previous experimental and theoretical results.
Page(s): 276-282
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.46(04) [April 2008]

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