Electronic studies of KH(2)PO(4)
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Authors
Benepe, J.W.
Reese, W.
Subjects
Advisors
Date of Issue
1971-05-01
Date
Publisher
American Physical Society
Language
Abstract
The results of electrocaloric studies of the electrical equation of state of KH(2)PO(4) in the temperature region within 1 K of the ferroelectric transition are reported. Chief emphasis is given to determination of the spontaneous polarization. A discontinuous polarization jump of 1.87 ± 0.09 C/cm² is found at T(c). Several tests of the validity of the phenomenological theory of ferroelectricity, including a noncalorimetric determination of the heat capacity, are made. It is shown that the phenomenological theory provides a good and consistent description of the thermodynamic behavior of PH(2)PO(4). No major discrepancies which might be linked to behavior near a phase transition are found. Any possible discrepancies are minor and confined to the temperature region T(c) - T < 0.1 K. It is shown that a term proportional to P(8) dominates the behavior. Evidence is presented that a portion of the calorimetric anomaly near T(c) is not directly related to the temperature dependence of the polarization.
Type
Article
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
8 p.
Citation
Physical Review B, v. 3, no. 9, May 1, 1971, pp. 3032-3039
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.