Estimation of the Anomalous Heat Capacity and Thermal Expansion of Rochelle Salt

The effect of external factors on dielectric permittivity of Rochelle salt: humidity, annealing, stresses, electric field

“…However, for the stress σ 1 , the presence of the bias field has further enhanced the theoretical values |∆T Ci |, only worsening the agreement with the experimental data of this work. At the moment, we have no satisfactory explanation of the disagreement between our experimental data and the data of [13] and of the calculations, especially in view of the fact that for hydrostatic pressure a complete coincidence with the literature data and with phenomenology has been obtained.…”

“…Here we used an assumption that, according to (6.1),σ 4 = 100 bar corresponds to a sum of σ 4 = 50 bar, σ 2 = 50 bar, σ 3 = 50 bar. Our data for the uniaxial stresses σ 1 , σ 2 , σ 3 are also in poor agreement with the phenomenology and with the literature data; however, the calculations agree with [13] fairly well. It seems likely that the disagreement between the experimental data of this work and of [13] should be attributed to the effect of sample defects.…”

“…Our data for the uniaxial stresses σ 1 , σ 2 , σ 3 are also in poor agreement with the phenomenology and with the literature data; however, the calculations agree with [13] fairly well. It seems likely that the disagreement between the experimental data of this work and of [13] should be attributed to the effect of sample defects. We recalculated the shifts of the maxima temperature with uniaxial pressure taking into account the role of internal bias field, determining them from (6.7).…”

“…Let us remind that the changes of the maxima temperatures with the electric field E 1 obtained in this work are almost the same for the two maxima (see figures 4, 5). In section 6.3 we shall compare our results with the corresponding literature data [13] obtained from the thermoelastic effect studies and with the data of the phenomenological analysis. As we shall see, our data qualitatively agree with the literature, except for the case of stress σ 3 .…”

“…The data, in particular, are available on hydrostatic pressure [7][8][9] and electric field [10][11][12] effects on the elastic constant and dielectric permittivity of the crystals. Uniaxial stress effects on the phase transitions in Rochelle salt were explored in [13] from the measurements of thermoelastic effect. Theoretically the effect of the shear stress σ 4 was studied in [14] within the modified Mitsui model.…”