A. V. Tyurin
Russian Academy of Sciences
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Featured researches published by A. V. Tyurin.
Inorganic Materials | 2011
K. S. Gavrichev; M. A. Ryumin; A. V. Tyurin; V. M. Gurevich; L. N. Komissarova
The heat capacity of GdVO4 has been determined by adiabatic calorimetry in the range 5–345 K. The present experimental data and earlier results have been used to evaluate the thermodynamic functions of gadolinium orthovanadate (Cp0(T), S0(T), H0(T) − H0(0), and Φ0(T)) as functions of temperature (5–350 K). Its Gibbs energy of formation is determined to be ΔfG0(GdVO4, 298.15 K) = −1684.5 ± 1.6 kJ/mol.
Geochemistry International | 2007
V. M. Gurevich; O. L. Kuskov; K. S. Gavrichev; A. V. Tyurin
Geological–geophysical data obtained by the Galileo spacecraft during its traveling around Jupiter’s satellites suggest the presence of a water layer (in terrestrial terms, marine or oceanic water) from tens (Europe) to a few hundred (Ganymede and Callisto) kilometers thick beneath an outer solid ice shell [1–2]. The oceans of Europa, Ganymede, and Callsito are supposedly high-pressure electrolytic solutions. The presence of water supports the hypotheses of the existence of primitive extraterrestrial life forms in the surface ocean. The outer shells of Jupiter’s icy satellites consist mainly of H 2 O ice contaminated with dark non-ice component (carbonaceous chondrite-type matter). The data obtained by the Galileo probe point out the presence of mixtures of salt crystal hydrates ( MgSO 4 · n H 2 O, Na 2 SO 4 · n H 2 O , and others) on the ice surface of the satellites [3].
Geochemistry International | 2010
K. S. Gavrichev; M. A. Ryumin; A. V. Tyurin; V. M. Gurevich; L. N. Komissarova
The heat capacity of xenotime YPO4(c) was measured by adiabatic calorimetry at 4.78–348.07 K. Our experimental and literature data on H0(T)-H0(298.15 K) of Y orthophosphate were utilized to derive the Cp0(T) function of xenotime at 0–1600 K, which was then used to calculate the values of thermodynamic functions: entropy, enthalpy change, and reduced Gibbs energy. These functions assume the following values at 298.15 K: Cp0 (298.15 K) = 99.27 ± 0.02 J K−1 mol−1, S0(298.15 K) = 93.86 ± 0.08 J K−1 mol−1, H0(298.15 K) − H0(0) = 15.944 ± 0.005 kJ mol−1, Φ0(298.15 K) = 40.38 ± 0.08 J K−1 mol−1. The value of the free energy of formation ΔfG0(YPO4, 298.15 K) is −1867.9 ± 1.7 kJ mol−1.
Russian Journal of Physical Chemistry A | 2009
K. S. Gavrichev; M. A. Ryumin; A. V. Tyurin; V. M. Gurevich; L. N. Komissarova
The heat capacity of EuPO4 was measured by adiabatic calorimetry over the temperature range 9.81–298.48 K. The experimental and literature data were generalized to obtain the temperature dependence of the heat capacity of europium orthophosphate from 0 to 1600 K. This dependence was used to calculate thermodynamic functions (entropy, enthalpy, and reduced Gibbs energy). The data on the heat capacity of europium orthophosphate and diamagnetic lanthanum orthophosphate were used to estimate the noncooperative magnetic transition (Schottky anomaly) value.
Inorganic Materials | 2013
K. S. Gavrichev; M. A. Ryumin; A. V. Tyurin; V. M. Gurevich; G. E. Nikiforova; L. N. Komissarova
The thermodynamic functions of YbPO4 have been determined experimentally in the temperature range 6–1745 K. The results have been used to calculate temperature-dependent heat capacity, entropy, enthalpy increment, and reduced Gibbs energy of YbPO4 in the range 6–1800 K. The Gibbs energy of formation of ytterbium orthophosphate (ΔfG0(298.15 K)) has been determined.
Inorganic Materials | 2010
K. S. Gavrichev; M. A. Ryumin; A. V. Tyurin; L. N. Komissarova
The heat capacities of lanthanum and lutetium orthovanadates have been measured at temperatures from 7 to 345 K using an adiabatic calorimeter. No anomalies have been detected in the heat capacity data. The thermodynamic functions (Cp0(T), S0(T), and H0(T) − H0(0)) of the two compounds have been calculated in the temperature range studied, and their Debye characteristic temperatures have been estimated.
Geochemistry International | 2012
V. M. Gurevich; M. A. Ryumin; A. V. Tyurin; L. N. Komissarova
The heat capacity of gadolinium orthophosphate (GdPO4) measured in the temperature range 11.15–344.11 K by adiabatic calorimetry and available literature data were used to calculate its thermodynamic functions at 0–1600 K. At 298.15 K, these functions are as follows: Cp0(298.15 K) = 101.85 ± 0.05 J K−1 mol−1, S0(298.15 K) = 123.82 ± 0.18 J K−1 mol−1, H0(298.15 K)–H0(0) = 17.250 ± 0.012 kJ mol−1, and Φ0(298.15 K) = 65.97 ± 0.18 J K−1 mol−1 The calculated Gibbs free energy of formation from the elements of GdPO4 is ΔfG0 (298.15 K) = −1844.3 ± 4.7 kJ mol−1.
Russian Journal of Inorganic Chemistry | 2009
K. S. Gavrichev; A. V. Tyurin; M. A. Ryumin; A. V. Khoroshilov; G. D. Nipan; V. A. Ketsko; T. N. Kol’tsova; I. Yu. Pinus; G. A. Buzanov; N. A. Votinova
The low-temperature heat capacity of Zn 0.98Co0.02O oxide was measured by adiabatic calorimetry. The formation of a solid solution was shown to be accompanied by a change in the entropy by 0.4 J/(K mol). No anomalies in the heat capacity or the thermal behavior confirming the phase transformations found earlier by other methods were observed. A heat capacity anomaly was revealed below 15 K and tentatively attributed to a change in the magnetic properties of the substance.
Inorganic Materials | 2007
A. V. Tyurin; K. S. Gavrichev; V. P. Zlomanov
The heat capacity of InSe has been measured at temperatures from 11.14 to 325.26 K using an adiabatic calorimeter. The results differ significantly from earlier data (by ∼2.2% at 200 K). The smoothed heat capacity data have been used to evaluate temperature-dependent thermodynamic functions (entropy, enthalpy increment, and reduced Gibbs energy) of indium selenide. Its thermodynamic properties under standard conditions are Cp0 (198.15 K) = 49.43 ± 0.10 J/(K mol), S0(298.15 K) = 82.20 ± 0.16 J/(K mol), H0(298.15 K) − H0(0) = 10.94 ± 0.02 kJ/mol, and Φ0(298.15 K) = 45.50 ± 0.09 J/(K mol). The Debye characteristic temperature of InSe evaluated from the heat capacity data is 275 ± 15 K.
Inorganic Materials | 2014
A. V. Tyurin; A. D. Izotov; K. S. Gavrichev; V. P. Zlomanov
The fractal model of heat capacity is shown to be applicable to GaSe, Ga2Se3, GaTe, Ga2Te3, InSe, and InTe. The parameters of the model are determined: characteristic temperature and temperature-dependent multifractal (fracton) dimension.