1989•Journal of the Japan Institute of Metals and MaterialsOpen access

Determination of the Standard Gibbs Free Energy of Formation of NiMo2B2 and the Activity of the Ni-Mo Binary System by EMF Measurement

Koichiro Koyama, Yasuhiko Hashimoto, Kenji Suzuki, Shuhji Kameyama

Abstract

The standard Gibbs free energy of formation of NiMo2B2 has been determined in the temperature range from 1183 to 1423 K by measuring electromotive forces of a galvanic cell having a solid oxide electrolyte. Also, the standard Gibbs free energy of formation of MoO2 and the Gibbs free energy of mixing of the Ni-Mo binary system, which are necessary to determine the standard Gibbs free energy of formation of NiMo2B2, have been determined in the temperature range from 1183 to 1423 K, The results obtained are as follows:(1) ΔGf°(NiMo2B2)=−250000+19.7T±1000 J/mol (1183∼1423 K).(2) ΔGf°(MoO2)=−567700+160.0T±200 J/mol (1183∼1423 K).(3) The standard Gibbs free energy of formation of the intermediate phase, NiMo, which exists in the Ni-Mo binary system is:(This article is not displayable. Please see full text pdf.)

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Key concepts: Gibbs free energy, Electromotive force, Chemistry, Galvanic cell, Thermodynamics, Standard enthalpy of formation, Electrolyte, Analytical Chemistry (journal)