Hydrogen-bond configuration parameters for ferroelectrics isomorphic to KH(2)PO(4)
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The small tunneling approximation to the hydrogen-bond-ordering model of ferroelectrics of the KH(2)PO(4) family has been fitted to experimental data for ferroelectrics with composition X Y(2) ZO(4) where X is K, Rb or Cs, Y is the proton or deuteron, and Z is P or As. In almost all cases a quite satisfactory account of the thermodynamic parameters is obtained. the required tunneling parameters are 0, or nearly so, for the deuterated compounds and seem nearly independent of the cation. The hydrogen-bond occupation energy associated with the lowest-energy "disordered" state varies nearly linearly with cation radius for each series of compounds. The results are consistent with the suggestion that the energy parameters of deuterated and nondeuterated materials should scale as the square of the off-center distance.
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Reese, W. (1969-06-10);The Comments and Addenda section is for short communications which are not of such urgency as to justify publication in Physical Review Letters and are not appropriate for regular articles. It includes only the following ...
Studies of phase transitions in order-disorder ferroelectrics. III. The phase transition in KH(2)PO(4) and a comparison with KD(2)PO(2) Reese, W. (American Physical Society, 1969-05-10);Calorimetric, dielectric, and electrocaloric measurements have been performed on single-crystal samples of KH(2)PO(4) in the neighborhood of the ferroelectric phase transition, and show that the transition is of first ...
Studies of phase transitions in order-disorder ferroelectrics. II. Calorimetric investigation of KD(2)PO(4) Reese, W.; Dyer, J. N. (American Physical Society, 1968-03-10);Calorimetric 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 ...