Abstract
Single phases of ammonium penta- and tetra- molybdates were prepared. The massic heat capacities at normal pressure below their decomposition temperatures were measured by drop method. The relationships of the massic heat capacities of ammonium molybdates with those of the decomposition products were also discussed. The results show that the massic heat capacities of ammonium molybdates can be estimated by adding together contributions from their decomposition products, and the less change of chemical bonds, the more accurate of the estimation.
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QI Ying-ben, WANG Jin-fa, DING Zhi-hu, et al. Study on the crystalline of ammonium tetramolybdates[J]. Rare Metals (in Chinese), 1986, 10(3):207–209.
YIN Zhou-lan. The effect of the physical and chemical properties and pretreatment on the forms of the molybdenum powder (in Chinese)[D]. Changsha: Central South University of Technology, 1994.
YIN Zhou-lan, CHEN Qi-yuan, ZHANG Heng-zhong, et al. Measurement of the heat capacity of ammonium tetramolybdate in the micro powder form[J]. Acta Physico-Chemica Sinica (in Chinese), 1997, 13(5): 455–458.
Ditmars D A, Ishihara S, CHANG S S, et al. Enthalpy and heat capacity of standard reference material: synthetic sapphire (α-Al2O3) from 10 K to 2250 K[J]. Journal of Research of the National Institute of Standards & Technology, 1982, 87(2): 159–164.
Mezaki R, Tilleux E W. Thermodynamics of nuclear materials[A]. Proc IAEA Symposium Vienna[C]. Vienna, 1962. 775.
Kubaschewski O, Aclock C B. Metallurgical thermochemistry (5th edition)[M]. New York: Pergamon Press, 1979. 180.
Barin I, Knacke O. Thermochemical properties of inorganic substances[M]. Springer-Verlag, 1993.
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Foundation item: The Doctorate Program Fund of China (No. 9553305)
Biography of the first author: YIN Zhou-lan, professor, born in Feb. 1965, received Ph. D degree in 1994, majoring in physical chemistry of metallurgy and materials.
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Yin, Zl., Chen, Qy., Zhang, Pm. et al. Massic heat capacities of ammonium penta- and tetra- molybdates. J Cent. South Univ. Technol. 7, 216–218 (2000). https://doi.org/10.1007/s11771-000-0057-1
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DOI: https://doi.org/10.1007/s11771-000-0057-1