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dc.contributor.authorReese, W.
dc.contributor.authorDyer, J. N.
dc.date.accessioned2016-01-07T22:38:06Z
dc.date.available2016-01-07T22:38:06Z
dc.date.issued1968-03-10
dc.identifier.citationPhysical Review, v. 167, no. 2, March 10, 1968, pp. 504-510en_US
dc.identifier.urihttp://hdl.handle.net/10945/47486
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractCalorimetric measurements on KD(2)PO(4) have been conducted, and the transition is found to be first order with an entropy change at T(c) of (0.2407+/- 0.0016)R. The entropy change associated with destruction of the polarization from O degrees K to T(c) is found to be (0.4234+/-0.0071)R. It is shown that a mean-field theory of the type proposed by Silbee, Uehling, and Schmidt can give a good account of the heat capacity and polarization to within 1 degree K of T(c), although the latent heat and entropy are not predicted satisfactorily, presumably because of the breakdown of the mean-field approximation close to the transition. Below T(c) the divergence in the heat capacity may be argued to be logarithmic in the region closer than 1 degree to T(c), or to be a 1/(T(c)-T)(1/2) in the region T(c)-2(o)<T<T(c)-0.2(o). Arguments are offered in favor of the logarithmic divergence.en_US
dc.description.sponsorshipWork supported by the U.S. Office of Naval Research through a Naval Postgraduate School Foundation granten_US
dc.description.sponsorshipThis work was supported in part by the National Science Foundation and the Naval Postgraduate School Research Foundation.en_US
dc.format.extent7 p.en_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis 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.en_US
dc.titleStudies of phase transitions in order-disorder ferroelectrics. II. Calorimetric investigation of KD(2)PO(4)en_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentPhysicsen_US


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