Dielectric Constants and Their Pressure and Temperature Derivatives for Ionic Crystals

Shanker, J.; Dixit, S.

doi:10.1002/pssa.2211230102

Cited by 35 publications

(9 citation statements)

References 207 publications

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“…The variation of the low-frequency dielectric constants with temperature and pressure has been a subject for analysis by physicists for several decades. , Several studies review the changes in refractive index of solids with pressure and attempt to explain these changes in terms of the polarizabilities of ions. , These two sets of data may be combined to analyze the electronic and ionic contributions to electrostriction. The electronic and ionic contributions to electrostriction may be compared for some well characterized oxide and fluoride materials.…”

Section: Electrostriction and Polarization Mechanismsmentioning

confidence: 99%

Electrostriction: Nonlinear Electromechanical Coupling in Solid Dielectrics

et al. 1997

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Electrostriction is the basis of electromechanical coupling in all insulators. The quadratic electrostrictive strain x ij associated with induced polarization components Pk and P l is given by x ij = Q ijkl P k P l . Two converse electrostrictive effects may also be defined. In this paper, some trends in structure−property relationships that govern electrostriction are identified, along with the problems that limit our understanding of this fundamental electromechanical property. Electrostrictive coefficients range from the ∼10-3 m4/C2 in relaxor ferroelectrics to ∼103 m4/C2 in some polymers. High-sensitivity techniques, such as interferometry or compressometry, are necessary to accurately measure electrostrictive effects in most insulators. But even in low-K dielectrics, electrostrictive stresses may initiate breakdown in high-field environments such as microelectronic components with small dimensions, high-voltage insulators, or in high-power lasers. In polymeric materials, charge injection mechanisms may produce local electric field concentrations that can cause large electrostrictive strains. The electromechanical properties in polymers have also been observed to vary with the thickness of the specimen. A brief description of the anharmonic nature of electrostriction and its frequency dependence is included.

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Section: Electrostriction and Polarization Mechanismsmentioning

confidence: 99%

Electrostriction: Nonlinear Electromechanical Coupling in Solid Dielectrics

et al. 1997

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“…However, the derivative of Z*e is in general unknown. This difficulty is overcome by writing the effective charge as [4] (Z*e)' = aiA.…”

Section: E~m ]mentioning

confidence: 99%

Pressure and temperature dependences of the low energy excitation in superionic conductors based on the ionic plasma model

Aniya

Tomoyose

Kobayashi

1996

Physica Status Solidi (b)

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Superionic conductors form a particular class of solid materials characterized by ionic conductivities of an order of magnitude as is usually found in molten salts. There, the high ionic conductivity is due to the movement of one kind of ions between sites provided by the immobile ion sublattice. A low energy excitation (LEE) mode has been observed in many cation superionic conductors (SIC) by making use of inelastic neutron scattering experiments [l, 21. Many models of LEE have been proposed till now [2]. However, concerning the origin of LEE, there is no general consensus. 1) W L is almost independent of wavenumber.2) The magnitude of WL is in the range of 2 to 6meV and is proportional to M-'/2, 3) For SIC with the same species of mobile ion, WL is not sensitive to the crystal strucBased on the above observations, Kobayashi et al.[3] have proposed the ionic plasma model for the LEE in cation SIC. In this model, the LEE is interpreted as being a plasma oscillation of cations on the anion background. It must be remarked here that by the term "anion background", we are not considering a uniform background as in the case of the well-known electronic plasma oscillations. The LEE is viewed as a collective motion of cations in a cage formed by anions. In the present note, the pressure and temperature dependences of the LEE in SIC are studied based on the ionic plasma model. E~M ]Kumamoto 860, Japan. Okinawa 903-01, Japan. Niigata 950-21, Japan.

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“…In the theories of dielectric constant, refractive index, and optical properties, the ionic polarizabilities play an important role [1][2][3][4][5]. The concept of ionic properties appears in the present study and is of particular importance in complex solids, where the contributions of less complex ions (e.g., alkali metal cations) may sometimes be "imported" from other solids.…”

Section: Introductionmentioning

confidence: 95%

Pressure dependence of ionic polarizabilities in crystals

2005

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An analysis is given for the application of different empirical methods and their adaptation in order to study the pressure dependence of ionic polarizabilities of more complex materials than those already studied. Comparison of results shows that upper and lower bounds can be obtained but, for further precision in the proposals, it would be necessary in the future to overcome the known limitations of ab initio calculations when applied to complex systems at different pressures. Intermediate more sophisticated evaluations in order to guide the study with empirical methods are discussed.

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Dielectric Constants and Their Pressure and Temperature Derivatives for Ionic Crystals

Cited by 35 publications

References 207 publications

Electrostriction: Nonlinear Electromechanical Coupling in Solid Dielectrics

Electrostriction: Nonlinear Electromechanical Coupling in Solid Dielectrics

Pressure and temperature dependences of the low energy excitation in superionic conductors based on the ionic plasma model

Pressure dependence of ionic polarizabilities in crystals

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