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Activity–Composition Relations in the Nickel Oxide–Magnesium Oxide System at 1300 K by the Solid‐State Galvanic Cell Technique
Author(s) -
Kale Girish M.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb08286.x
Subject(s) - galvanic cell , non blocking i/o , solid solution , nickel oxide , electrolyte , magnesium , oxide , materials science , nickel , salt (chemistry) , solid state , inorganic chemistry , analytical chemistry (journal) , chemistry , metallurgy , chromatography , biochemistry , catalysis , electrode
The activity of NiO in NiO‐MgO rock salt solid solution has been measured at 1300 K by employing a solid‐state galvanic cell: Pt,Ni+ NiO||(CaO)ZrO 2 ||Ni + (Ni x ,Mg l‐x )O, Pt. A high‐density tube of Zr0 2 ‐15 mol% CaO has been used as the solid electrolyte for the emf measurements. The activities of the component oxides in the rock salt solid solution exhibit negative deviation from ideality at the temperature of investigation. The solid solution obeys regular solution behavior at 1300 K. The value of the regular solution parameter is found to be ‐12000 ((l000) J mol ‐1 . The composition dependence of ΔG Ex obtained in this study agrees reasonably well with the calorimetric data reported in the literature for NiO‐MgO solid solution.