☆ 4.5 Article

Standard molar Gibbs free energy of formation of Pb5CrO8(s), Pb2CrO5(s), and PbCrO4(s)

JOURNAL OF CHEMICAL THERMODYNAMICS (2010)

期刊

JOURNAL OF CHEMICAL THERMODYNAMICS

卷 42, 期 1, 页码 1-7

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

DOI: 10.1016/j.jct.2009.06.026

关键词

Gibbs energy; Lead chromates; EMF measurements

类别

Thermodynamics Chemistry, Physical

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摘要

Standard molar Gibbs free energy of formation of ternary oxides Pb5CrO8(s), Pb2CrO5(s), and PbCrO4(s) were determined by measuring equilibrium oxygen partial pressures over relevant phase fields using manometry and solid oxide electrolyte based emf methods and are given by: Delta(f)G(m)(o)Pb(5)CrO(8) (s) 0.55/(kJ . mol(-1)) = -1809.4 + 0.6845(T/K) (837 <= T/K <= 1008) Delta(f)G(m)(o)Pb(2)CrO(5)(s) 0.30/(kJ . mol(-1)) = -1161.3 + 0.4059(T/K) (859 <= T/K <= 1021) Delta(f)G(m)(o)PbCrO(4)(s) 0.17/(kJ . mol(-1)) = -909.8 + 0.3111 (T/K) (863 <= T/K <= 1093), (C) 2009 Elsevier Ltd. All rights reserved.

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