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Enthalpy and heat capacity of molybdenum disulfide

Datetime:2016/7/22 22:08:38hit:10500

Enthalpy and heat capacity of molybdenum disulfide. Measurements were made, using the method of mixtures, of the enthalpy and heat capacity of molybdenum disulfide in the temperature range 500®C1700°„K. The effect of temperature on the enthalpy and heat capacity of the compound investigated was determined. On the basis of an analysis of the heat capacity of molybdenum disulfide in a wide temperature range, equations were derived for the temperature dependence of the heat capacity, enthalpy, and entropy of MoS 2 at 0-1700°„K. The equations consist of combinations of the Debye and Einstein functions, which reflect the harmonic vibrations of the crystal lattice of the disulfide at temperatures of up to 500°„K, and anharmonic corrections, allowing for the nonharmonic vibrations of atoms set up in the MoS 2 crystal lattice at high temperatures. A table has been compiled of values recommended for practical application of the thermodynamic characteristics °™ enthalpy, heat capacity, entropy, and reduced isobaric-isothermal potential- of molybdenum disulfide for the temperature range 298®C1700°„K.