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21.
I.N. Flerov M.V. Gorev V.D. Fokina E.V. Bogdanov N.M. Laptash 《Journal of fluorine chemistry》2011,132(10):713-718
Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)3Ta(O2)2F4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. 相似文献
22.
M. V. Gorev V. S. Bondarev S. I. Raevskaya M. P. Ivliev I. P. Raevskii I. N. Flerov 《Physics of the Solid State》2014,56(2):367-372
The heat capacity and thermal expansion of ceramic samples of the Na0.95K0.05NbO3 solid solution have been investigated over a wide temperature range of 100–750 K. The observed anomalies in the heat capacity and thermal expansion at T 4 = 297 K, T 3 = 535 K, T 2 = 665 K, and T 1 ≈ 710 K correspond to the sequences of phase transitions N → Q → G → S → T1. It has been shown that, as a result of the phase transitions, the unit cell volume at T 4 and T 2 decreases, and at T 3 and T 1, increases with increasing temperature. The directions of the shift of the phase transition temperatures induced by hydrostatic pressure have been determined. It has been established that all structural transformations are accompanied by relatively small variations in the entropy. Different mechanisms of the structural distortions have been discussed. 相似文献
23.
M. V. Gorev I. N. Flerov A. V. Kartashev S. Guillemet-Fritsch 《Physics of the Solid State》2012,54(9):1785-1789
The thermal expansion of the CaCu3Ti4O12 ceramics has been measured over a wide temperature range 120?C1200 K. The high quality of the samples under study has been confirmed by good agreement of the results of measurements of the heat capacity in the range 2?C300 K and in the vicinity of the phase transition of magnetic nature at 25 K with the data for the single crystal. No anomalies in the thermal expansion that can be associated with the phase transition at 726?C732 K assumed by other investigators have been found. The influence exerted on the thermal expansion by the heat treatment of the sample in a helium atmosphere and in air has been investigated. 相似文献
24.
M. V. Gorev I. N. Flerov V. S. Bondarev M. Maglione A. Simon 《Physics of the Solid State》2011,53(10):2073-2079
The strain, the thermal expansion coefficient, and the permittivity of ceramic samples of (Ba1 − x
Bi2x/3)TiO3 solid solutions with x = 0, 0.01, 0.03, and 0.05 have been studied in the temperature range 120–700 K. Based on an analysis of the results, the
temperature-composition phase diagram has been refined, and the temperature dependence of the polarization has been calculated. 相似文献
25.
E. A. Mikhaleva I. N. Flerov M. V. Gorev M. S. Molokeev A. V. Cherepakhin A. V. Kartashev N. V. Mikhashenok K. A. Sablina 《Physics of the Solid State》2012,54(9):1832-1840
The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80?C970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram. 相似文献
26.
Bogdanov E. V. Pogoreltsev E. I. Gorev M. V. Molokeev M. S. Flerov I. N. 《Physics of the Solid State》2019,61(2):192-200
Physics of the Solid State - The crystals of (ND4)3VO2F4 with a high degree of deuteration (~87%) have been grown and a significant (~1.5%) increase in the unit cell volume has been detected. The... 相似文献
27.
Pogorel’tsev E. I. Mel’nikova S. V. Kartashev A. V. Gorev M. V. Flerov I. N. Laptash N. M. 《Physics of the Solid State》2017,59(5):986-991
Physics of the Solid State - The thermal, optical, and dielectric properties of fluoride Rb2TaF7 were investigated. It was observed that the variation in chemical pressure in fluorides A 2 +TaF7... 相似文献
28.
I. N. Flerov M. V. Gorev V. D. Fokina A. F. Bovina M. S. Molokeev Yu. V. Boĭko V. N. Voronov A. G. Kocharova 《Physics of the Solid State》2006,48(1):106-112
A new chemical compound, (NH4)2KWO3F3, was synthesized. The Rietveld-refined crystal structure was found to be cubic at room temperature and to belong to the elpasolite
family (space group
). The heat capacity and unit cell parameters were studied within a broad temperature range. A second-order phase transition
was found to occur at 235.4 K and to be well described in terms of phenomenological theory. Hydrostatic pressure broadens
the temperature interval of stability of the cubic phase (dT0/dp = −10.8 K GPa−1). A possible model of structural ordering based on a comparison of the entropy parameters and electron density distribution
in oxygen and fluorine atoms is discussed. 相似文献
29.
An intensive electrocaloric effect in the uniaxial ferroelectric NH4HSO4 near the second-order phase transition (T 1 ≈ 271 K) is studied. A high electrical conductivity of the NH4HSO4 crystal is revealed, and its temperature dependence is investigated. The results obtained are analyzed together with the data available for the ferroelectrics, which hold promise for the use as solid-state cooling agents. 相似文献
30.
M. V. Gorev I. N. Flerov V. S. Bondarev Ph. Sciau 《Journal of Experimental and Theoretical Physics》2003,96(3):531-537
Heat capacity of the PbMg1/3Nb2/3O3 compound is measured using the methods of adiabatic and differential scanning calorimetry in the temperature range 80–750 K. Two blurred anomalies on the C p (T) dependence are observed in wide temperature intervals of 200–400 K and 500–700 K. The results of studies are discussed together with data on the structure and phonon spectrum in the framework of spherical random bond-random field model. 相似文献