Heat capacity of potassium tungstates K2WnO3n + 1(n = 2, 3, 4) at temperatures from 273 K to 979 K

Author： Chen Q.   Liu S.   Zhang P.  

Publisher： Academic Press

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.31, Iss.4, 1999-04, pp. : 513-519

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Abstract

Compounds K2Wn O3n + 1 (n = 2, 3, 4) were synthesized using a pyrometallurgical technique. The products were characterized by X-ray diffraction analysis and found to be single-phase compounds. The enthalpy increments Δ273.15 K T Hm o of each compound were measured by a drop method using a high-temperature Calvet calorimeter HT-1000 in the temperature range (273 to 979) K {or T = (273 to 878) K for K2W2O7}. The expression for molar heat capacity of each compound against temperature was obtained from experiment results.

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