Measurement of Thermal Expansion and Spontaneous Strain of Rochelle Salt

Imai, Kiyoyasu

doi:10.1143/jpsj.41.2005

Cited by 17 publications

(20 citation statements)

References 15 publications

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“…Alternatively, the coefficients of thermal expansion can be found by numerical differentiation of equation (8) for the strains ε i with respect to temperature; the results, of course, coincide. The coefficients α i are expected to have small anomalies at the Curie temperatures [30,31]. The molar specific heat at constant pressure of the model is obtained from the molar entropy…”

Section: -5mentioning

confidence: 99%

“…d 1i , i = 1, 2, 3) and elastic (c i4 ) tensors [27][28][29], appearing in the ferroelectric phase only, should be also described by the model. The other characteristics, included into the fitting, are thermal expansion coefficients and dilatations [30,31], as well as the diagonal-strain-related elastic constants [32] c ij or compliances s ij (i, j = 1, 2, 3).…”

Section: Introductionmentioning

confidence: 99%

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Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6·4H_2O

Moina¹,

Левицкий²,

Zachek³

2011

Condens. Matter Phys.

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We elaborate a modification of the deformable two-sublattice Mitsui model of [Levitskii R.R. et al., Phys. Rev. B. 2003, 67, 174112] and [Levitskii R.R. et al., Condens. Matter Phys., 2005, 8, 881] that consistently takes into account diagonal components of the strain tensor, arising either due to external pressures or due to thermal expansion. We calculate the related to those strains thermal, piezoelectric, and elastic characteristics of the system. Using the developed fitting procedure, a set of the model parameters is found for the case of Rochelle salt crystals, providing a satisfactory agreement with the available experimental data for the hydrostatic and uniaxial pressure dependences of the Curie temperatures, temperature dependences of spontaneous diagonal strains, linear thermal expansion coefficients, elastic constants c E ij and c E i4 , piezoelectric coefficients d 1i and g 1i (i = 1, 2, 3). The hydrostatic pressure variation of dielectric permittivity is described using a derived expression for the permittivity of a partially clamped crystal. The dipole moments and the asymmetry parameter of Rochelle salt are found to increase with hydrostatic pressure.

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Section: -5mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6·4H_2O

Moina¹,

Левицкий²,

Zachek³

2011

Condens. Matter Phys.

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“…2. The linear-expansion coefficient a, along the ferroelectric axis of the crystal, measured by Imai [17], is presented in the lower inset of Fig. 3.…”

Section: Methodsmentioning

confidence: 99%

“…We have fitted the most reliable data of Jona [18,19] about the RS crystal density with the equation [14], x rays Vignes [16], dilatometric Imai [17], dilatometric Jona [18] Alexandru, this paper Kawai [25] for A 80%, D 32% surrounding humidity. The lower inset presents the linearexpansion coefficient a, along the ferroelectric axis of the RS crystal according to Imai [17].…”

Section: Methodsmentioning

confidence: 99%

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Second-order transition in Rochelle-salt saturated solutions

Alexandru

1992

Phys. Rev. A

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A sui generis second-order transition in water solutions of Rochelle-salt crystal has been seen during measurements of both the solubility and solution densities versus temperature. Both the volumeexpansion coefficients and the temperature differential of solution densities for several compositions along the solubility curve present a jump discontinuity around a saturation temperature of 24'C. Electrical measurements revealed a small peak in the dielectric constant, showing a minute ferroelectric component of solute near 24'C in solution. The loss tangents of solution and the dissolution enthalpy (drawn from the solubility curve) show other characteristics. The excess volume of solute vanishes around 31'C, showing an "ideal" behavior of solution in this region. All data seem to indicate the tartrate molecule NaKC4H406 associates with the four water molecules in solution, just like the water molecules undergoing crystallization. This quasicrystalline structure of the solute is stable in solutions up to about 40'C.A tentative interpretation as a critical phenomenon is made for the volume-expansion coefficient. This response function with a cusplike singularity at 24 C has a critical point exponent of about -,. A oneto-one correspondence within four temperature ranges (between 16 -18'C and 58'C), of the properties of the crystal and solute Rochelle salt, has been experimentally proved in five types of measurements.

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Raman Spectroscopic Investigation of Ferroelectric Phase Transitions in Rochelle Salt

Winterfeldt

1980

Physica Status Solidi (b)

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Raman scattering spectra of single crystals of Rochelle salt are recorded a t 2 K and a t several temperatures between 248 and 300 K in the spectral region from 0 to 4000 cm-l. The frequencies of some phonon modes soften or harden in the intermediate ferroelectric phase between the two Curie points which are known to exist in this material. I n the paraelectric phases the frequencies remain constant. This behaviour can be explained by applying a simple nonlinear pseudospinphonon coupling theory originally developed for the TGS family and the incommensurate phase transition in thiourea. The anomalous specific heat due to temperature-dependent optical phonon modes is also discussed. Es werden die Ramanspektren von Rochellesalz-Einkristallen

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Measurement of Thermal Expansion and Spontaneous Strain of Rochelle Salt

Cited by 17 publications

References 15 publications

Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6·4H_2O

Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6·4H_2O

Second-order transition in Rochelle-salt saturated solutions

Raman Spectroscopic Investigation of Ferroelectric Phase Transitions in Rochelle Salt

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