Relaxational dynamics of monoclinic ferroelectric RbD2PO4

Levitsky, R. R.; Zachek, I. R.; Kutny, I. V.; Schur, J. J.; Grigas, J.; Mizeris, R.

doi:10.1080/00150199008008905

Cited by 6 publications

(8 citation statements)

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“…Table 1 summarizes most of the recent data concerning relaxations in numerous displacive or order-disorder ferroelectrics: perovskites, tetragonal tungsten bronzes, etc. [46][47][48][49][50][51][52][53][54][55][56][57][58] Such high frequency relaxations have been ascribed to different origins. A description of the suggested models is given.…”

Section: High Frequency Relaxationsmentioning

confidence: 99%

Ferroelectric ceramics: defects and dielectric relaxations

2001

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Section: High Frequency Relaxationsmentioning

confidence: 99%

Ferroelectric ceramics: defects and dielectric relaxations

2001

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“…In the paraelectric phase these compounds crystallize in the4m class with four molecules in the body-centered unit cell (space group I42d with non-centrosymmetric point group D 12 2d ) [28][29][30][31]. In the polar phase the space group is Fdd (point group C 19 2v ) of the rhombic syngony with the axes rotated by 45 • with respect to the crystallographic axes of the paraelectric phase. The unit cell contains eight formula units.…”

Section: Introductionmentioning

confidence: 99%

“…The same holds for PbHPO 4 ferroelectrics (see [41][42][43][44]). In the RbD 2 PO 4 ferroelectrics the system of hydrogen bonds changes even more, and two phase transitions take place [45].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and dynamical properties of the KH_{2}PO_{4} type ferroelectric compounds. A unified model

Levitskii¹,

Zachek²,

Vdovych³

et al. 2009

Condens. Matter Phys.

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Within the framework of the proposed unified proton ordering model for the ferroelectric compounds of the KH 2 PO 4 family, in the four-particle cluster approximation for the short-range interactions and mean field approximation for the long-range interactions, we calculate thermodynamic and longitudinal dynamic characteristics of the KD 2 PO 4 type ferroelectrics and ND 4 D 2 PO 4 type antiferroelectrics. Calculations for partially deuterated K(H 1−x Dx) 2 PO 4 type ferroelectrics and N(H 1−x Dx) 4 (H 1−x Dx) 2 PO 4 type antiferroelectrics are performed within the mean crystal approximation. It is shown that at the proper choice of the theory parameters, a good quantitative description of experimental data for the KH 2 PO 4 family crystals is obtained.

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“…Modern statistical theory of condensed media pays a great attention to studies of ferroelectric and magnetic materials, described by pseudospin models with essential short-range and long-range interactions, especially of hydrogen-bonded ferroelectrics [1][2][3][4][5][6][7][8][9][10][11][12] and low-dimensional magnets [13,14]. For an adequate description of these objects, such an approach is required that would allow to use different techniques for taking into account short-range and long-range interaction.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the reference Hamiltonian, the reference problem can be solved exactly (see, for instance, [14,[31][32][33][34][35][36]) or approximately, with taking into account peculiarities of the reference system. The best description of the reference system for a wide class of pseudospin models can be obtained on the basis of the cluster expansions method (see [1][2][3][4][5][6][7][8][9][10][11][12][37][38][39]). In some papers [40][41][42][43] this method was successfully used for studies of disordered magnetic and ferroelectric materials.…”

Section: Introductionmentioning

confidence: 99%

Reference Approach in Theory of Pseudospin Systems

Левицкий¹,

Sorokov²,

Baran³

2000

Condens. Matter phys.

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For theoretical description of pseudospin systems with essential shortrange and long-range interactions we use the method based on calculations of the free energy functional taking into account the short-range interactions within the reference approach in cluster approximation. We propose a consistent formulation of the cluster expansion method for quantum pseudospin systems. We develop a method allowing one to obtain within the cluster approximation an Ornstein-Zernike type equation for reference cumulant Green function of an arbitrary order. In the two-particle cluster approximation we derived an explicit expression for pair temperature cumulant Green function of the reference system. In the cluster random phase approximation we calculated and studied thermodynamic characteristics, elementary excitation spectrum, and integral intensities of the Ising model in transverse field.

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Relaxational dynamics of monoclinic ferroelectric RbD2PO4

Cited by 6 publications

References 0 publications

Ferroelectric ceramics: defects and dielectric relaxations

Ferroelectric ceramics: defects and dielectric relaxations

Thermodynamics and dynamical properties of the KH_{2}PO_{4} type ferroelectric compounds. A unified model

Reference Approach in Theory of Pseudospin Systems

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