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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(09) [September 2011] >
| 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 M suggests that the relaxation describes the same mechanism at
various temperatures in HZT. |
| Page(s): | 613-618 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(09) [September 2011]
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