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Title: Dielectric relaxation and ac conductivity of double perovskite Ho2ZnTiO6
Authors: Mahato, Dev K
Dutta, Alo
Sinha, T P
Keywords: Dielectric properties;Double perovskite;Impedance spectroscopy
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: A new double perovskite holmium zinc titanate Ho2ZnTiO6 (HZT) synthesized by solid state reaction method under sintering temperature 1250°C has been investigated by alternating impedance spectroscopy. The X-ray diffraction analysis shows that the compound crystallizes in monoclinic phase at room temperature. A relaxation is observed in the entire temperature range as a gradual decrease in (w) and broad peak in (w) in the frequency dependent real and imaginary parts of dielectric constant, respectively. The frequency dependent electrical data are analysed in the framework of conductivity and electric modulus formalisms. Both these formalisms show qualitative similarities in relaxation times. The frequency dependence of the peak and M peak are found to obey an Arrhenius law with activation energy of 0.65 and 0.63 eV, respectively. Such a value of activation energy suggests the conduction in HZT which is due to polaron hopping based on the electron carriers. The scaling behaviour of imaginary part of electric modulus Msuggests that the relaxation describes the same mechanism at various temperatures in HZT.
Page(s): 613-618
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(09) [September 2011]

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