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Dielectric Behaviour of BaxSr1–xTiO3 Perovskites

Authors:

Ashok Kumar ,

Department of Physics, Garhwal University, Pauri Campus, Pauri (Garhwal), U. P., Pin – 246 001, India, IN
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UC Naithani,

Department of Physics, Garhwal University, Pauri Campus, Pauri (Garhwal), U. P., Pin – 246 001, India., IN
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BS Semwal

Department of Physics, Garhwal University, Pauri Campus, Pauri (Garhwal), U. P., Pin – 246 001, India., IN
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Abstract

Using the method of double - time thermal Green's functions and Kubo formalism, a general expression is derived for the complex dielectric constant of BaxSr1-xTiO3 ferroelectric crystal in the paraelectric phase taking into account the change of mass as well as harmonic force constant between impurity atom and host lattice atoms. The results are used to obtain an expression for the frequency dependence of the dielectric constant of BaxSr1-xTiO3 due to impurity and anharmonic scattering. To a first order approximation of the defect parameters the Curie temperature shift is found to depend only on the harmonic force constant changes between the impurity and host lattice atoms, and is proportional to the concentration of defects. The dielectric constant of ceramic SrTiO3 can be enhanced by the addition of cation impurities like lead, barium, zirconium etc.

doi:10.4038/sljp.v3i0.186

Sri Lankan Journal of Physics, Vol.3 (2002) 63-73

DOI: http://doi.org/10.4038/sljp.v3i0.186
How to Cite: Kumar, A., Naithani, U. & Semwal, B., (2002). Dielectric Behaviour of BaxSr1–xTiO3 Perovskites. Sri Lankan Journal of Physics. 3, pp.63–73. DOI: http://doi.org/10.4038/sljp.v3i0.186
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Published on 01 Dec 2002.
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