Dielectric relaxation in pseudo-one-dimensional ferroelectric CsD2PO4

Dielectric investigation of a solid solution of deuterated betaine

“…In the non-deuterated crystal the polar phase transition was observed at 79 K. The temperature shift of the phase transition due to the deuteration is 61 K. A Curie-Weiss law is not valid for ε . The temperature behaviour of the static dielectric constant can be explained by the modified one-dimensional Ising model [8,9]. In this model the interaction between neighbouring dipoles in one-dimensional chains is treated exactly whereas all additional (weak) interactions are taken into account via the mean-field approximation.…”

On the vibrational properties of CsD2PO4 crystal

“…They were intensively investigated in structural [1][2][3][4], spectroscopic [5][6][7][8], dielectric [9][10][11], acoustic [12], NMR [13] and dilatometric [14] studies. Nevertheless, the underlying phase-transition mechanism remains controversial.…”

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

“…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.…”