Thermodynamic study of the NiO-MgO system in the temperature range 1,073 to 1,473 K by a galvanic cell technique

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Metallurgical Transactions, B

DOI:https://doi.org/10.1007/BF02660993· OSTI ID:142337

Jakobsson, A; Sichen, D; Seetharaman, S ^[1]

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1. Royal Inst. of Tech., Stockholm (Sweden). Dept. of Theoretical Metallurgy

In the present work, the thermodynamic activities of NiO in NiO-MgO solid solutions were measured by means of the ZrO{sub 2}-CaO solid-electrolyte galvanic cell method in the temperature range 1,073 to 1,473 K. The systems shows a near-ideal behavior, while at lower temperatures, the results are anomalous at a high MgO content. Lattice parameter measurements show that the system conforms to Vegard`s law. The enthalpies estimated from the present results are compared with previous work as well as those estimated from theoretical models. A complete thermodynamic description and a calculation of the phase diagram of the NiO-MgO system are enabled by the application of a two-sublattice model.

• Sponsoring Organization: USDOE
• OSTI ID: 142337
• Journal Information: Metallurgical Transactions, B, Vol. 24B, Issue 6; Other Information: PBD: Dec 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL OXIDES
THERMODYNAMIC ACTIVITY
MAGNESIUM OXIDES
MATHEMATICAL MODELS
ELECTROMOTIVE FORCE
MEASURING METHODS
CERAMICS
METALLURGY