Relaxation mode in dielectric spectra of CsH₂PO₄

To the Theory of Relaxation Phenomena in Quasi-One-Dimensional Ferroelectrics With Hydrogen Bonds. Nonequilibrium Statistical Operator Approach

“…For pseudo 1D model Zumer [20] suggested the simplest decoupling of the chain, which leads to some interpolative equation for one-site DF that yields the generally known exact result for static susceptibility. But Zinenko [30] discovered that approximations of papers [21,22] lead to incorrect results in the lowtemperature region. Paper [32] suggests a detailed analysis of the coupled equations for time-dependent DF obtained from the Glauber master equation.…”

“…One of them yields thermodynamic and dynamic quantities of the model similar to those obtained within a cluster approach developed in papers [28,29]. These theoretical results were extensively used for the discussion and analysis of experimental data on ferroelectric of CsH 2 PO 4 type [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

“…The protons of the longer H-bonds are ordered in both phases. Deuteration significantly changes the temperature of the phase transition, the dielectric and thermal properties of CsH 2 PO 4 crystal [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. It is the evidence of the important role of H-bonds in the ferroelectricity of these crystals.…”

“…Papers [16][17][18][19][20][21][22][23][24][25][26][27] are focused on the discussion of the selected experiment and the suggested model parameters which provide the best fit to those data. Such a one-sided approach sometimes leads to incorrect conclusions.…”

“…Such a one-sided approach sometimes leads to incorrect conclusions. Thus, the authors of papers [22][23][24][25], comparing predictions of the model with such parameters with other measured quantities, found a marked disagreement and concluded that the model cannot describe the compounds under investigation. However, papers [28,29,32] show that the theory [28,32] which allows for short-and long-range interactions, describes thermodynamics and dynamics of these compounds with a satisfactory accuracy.…”