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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.42 [2004] >
IJPAP Vol.42(05) [May 2004] >
| Title: | Temperature and frequency dependence of width in sodium potassium niobate mixed system |
| Authors: | Uniyal, Manish
Bhatt, S C
Bhandari, R
Rao, M S Ramchandra
Pant, R P
Semwal, B S |
| Keywords: | Ferroelectricity
Piezoelectricity
Soft mode frequency |
| Issue Date: | May-2004 |
| Publisher: | CSIR |
| IPC Code: | H 01 L 41/00 |
| Abstract: | Considering a quadratic anharmonic model Hamiltonian and
using double time temperature dependent Green's function method and Dyson’s
equation treatment, expressions for the width in the frequency response for
mixed perovskite type ferroelectrics have been obtained. Using the
experimentally observed dielectric constant and loss tangent for Na1-xKxNbO3
[where x = 0, 0.4, 0.5], the temperature dependence of soft mode width in these
samples at 10 and 100 kHz has been calculated. Anomaly has been observed in the
behaviour of soft mode width, near the transition temperatures in these
compounds. |
| Page(s): | 341-346 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.42(05) [May 2004]
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