NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(04) [April 2010] >

Title: Dependence of specific heat on electric field in Ba1-xCaxTiO3 ferroelectric perovskites
Authors: Pradeep, Dushyant
Kumar, Ashok
Naithani, U C
Keywords: Anharmonicity
Curie temperature
Soft mode frequency
Specific heat
Ferroelectric perovskites
Issue Date: Apr-2010
Publisher: CSIR
Abstract: The electric field dependence of the specific heat of an anharmonic Ba1-xCaxTiO3 ferroelectric crystal has been calculated in its paraelectric phase from Silverman-Joseph Hamiltonian augmented with fourth order phonon coordinates using double times Green’s functions. The electric field dependent soft mode contribution to the specific heat is described by appropriate Einstein terms. The variation of the specific heat with temperature and defect parameters has been discussed for different values of field strengths. The effect of defects on specific heat can be observed in the presence of anharmonicity. The specific heat decreases with increase in external field and increases with increase in temperature which is in agreement with the previous results. As the Curie temperature is approached, the Cochran soft mode is held to be responsible for the anomalous behaviour of specific heat.
Page(s): 276-281
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(04) [April 2010]

Files in This Item:

File Description SizeFormat
IJPAP 48(4) 276-281.pdf215.71 kBAdobe PDFView/Open
 Current Page Visits: 942 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 166908 since 01-Sep-2015  Last updated on 28-Jun-2016Webmaster: