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THERMOPHYSICAL PROPERTIES OF SUBSTANCES

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The study of thermophysical properties and phase transformations is one of the main goals of the Institute's activities. New original methods have been developed for precise measurements of thermodynamic, transfer, and optical properties of solid, liquid, and gaseous substances, and materials in a wide range of state parameters and waves lengths (4-3500 K, 10-4-107 Pa, 0.4-5 mm).
    The following substances have been examined:
- freons: R-11, R-12, R-13, R-21, R-22, R-23, R-113, R-114, R-142, R-114B2, R-227, and R-236;
- water-salt solutions: LiBr, LiCl, CaCl2, NaCl+CaSO4, etc.;
- more than 50 pure elements, including alkaline, alkaline-earth, rare-earth, transitional, and high-melting metals;
- organic liquids: C6H6, C7H8, C8H10, C16H34, C17H37, C10H8, C12H10, (C6H5)2O, motor oils, and complex paraffins;
- more than 40 grades of steels and cast irons, 10 alloys of rare-earth metals, and more than 30 other alloys of nonferrous metals;
- and eutectic alloys: Fe58Co20Si12B10, Li17Pb83, Fe60Co20Si8B12, Fe5.8Co84.33Si74B24.5, and Mg17Pb83, intermetallic compounds: CeAl2, PrAl2, NdAl2, InSb, HgTe, CuTlSe2, CuTlTe2, systems of Cd-Hg-Te and Pb-Bi;
- oxides: B2O3, BeO, V2O3, Al2O3, SiO2, N2O4, CO2, and YAlO3; garnets: YAG, NGG, SGG, GGG, GCMZGG, YSGG, and KNGG; tungstates: KY(WO4)2, K2W2O7; systems: Al2O3 - Y2O3, KY(WO4)2 - K2W2O7;
- two and three-component systems based on potassium-titanyl-phosphate (KTiOPO4), lithium triborate (LiB3O5), barium borate (BaB2O4), cesium triborate (CsB3O5), cesium-lithium triborate (CsLiB6O10), and system of bismuth oxide-germanium oxide (Bi12GeO20 and Bi4Ge3O12);
- fluorides: UF6, YF3, LaF3, NdF3, SmF3, DyF3, GdF3, HoF3, ErF3, YbF3, LuF3, LiF3, and LiYF4;
- consolidated porous highly dispersed materials based on Al: Al+Ni and Al+Zr;
- fullerenes, small particles, and clusters of metals and non-conductors with a small number of atoms.
    Information tables used now in various fields of science and techniques were created at the Institute. Due to the results obtained, general regularities were established for the change of properties depending on chemical composition, state parameters, electronic structure, and crystalline structure of phases. Alterations of macroscopic characteristics during phase transformations were studied, as well as the influence of the material's purity on their properties. New forms of state equations and generalizing dependencies have been suggested. These results are applicable for the development of new materials with given exploitation parameters and for the prediction of their properties.

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The density of liquid Multicomponent steels at the point of hardening (liquidus).

The g-densimeter for studying thermal properties and phase transformations of solid and liquid materials with in a temperature range of 293-2500 K.

The massive mixing  calorimeter for measuring the enthalpy of solid and liquid substances within a temperature range of 450-2500 K.

The temperature difference of the liquid-vapor equilibrium for water and water solutions of lithium chloride depending on the concentration. Isotherms are being obtained for the equilibrium of pressures of saturated vapors.

Басин А.С., Груздев В.А., Рубцов Н.А., Станкус С.В.
Теплофизические свойства и фазовые превращения веществ и материалов // Теплофизика и аэромеханика, 1997, Т. 4, № 2, С. 247-258.

Stankus S.V., Khairulin R.A., Tyagel'shy P.V.
Thermal properties of rare earth fluorides in solid and liquid states // High Temperatures - High Pressures, 1995/1996, V. 27/28, P. 493-498.

Gruzdev V.A., Komarov S.G.
Sound velocity and dissociation kinetics in vaporous of dinitrogen tetroxide, Acustica, 1989, V. 68, No. 1, P. 46-51.

Рубцов Н.А., Аверков Е.И., Емельянов А.А. Свойства теплового излучения материалов в конденсированном состоянии // Новосибирск, 1988. 349 с.

Басин А.С. Исследования термических свойств веществ с применением гамма-метода // Теплофизические свойства веществ и материалов. М.: Издательство Стандартов, 1991, вып. 31, С. 100-131.

   
 

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© 2003 Institute of Thermophysics Sibirian Branch of Russian Academy of Sciences