Activity measurements in oxide solid solutions: The systems NiO-MgO and NiO-MnO in the temperature interval 1100–1300°C

Internal displacement reactions in multicomponent oxides: Part II. Oxide solid solutions of wide composition range

“…The deviation from ideality in (Co,Mg)O is less than that for (Fe,Mg)O. As a comparison, from the data for (Ni 0.5 Mg 0.5 ) O, [10,11] (Fe 0.5 Mg 0.5 )O, [13,14,15] and (Co 0.5 Mg 0.5 )O, [17,18,19] the following values for MgO are estimated (pure MgO as standard state):…”

“…Several studies are available for the thermodynamic activities of MgO in (Ni,Mg)O, [10,11] (Fe,Mg)O, [12][13][14][15] and (Co,Mg)O [16][17][18][19] solid solutions. The system (Ni,Mg)O is nearly ideal, while (Fe,Mg)O exhibits a positive deviation from ideality in all the studies.…”

MODELAGEM TERMODINÂMICA DO SISTEMA MgO-NiO

“…Em 1961, Hahn e Muan estudaram o sistema MgO-NiO através do método de equilíbrio com gás (H2/CO2) com o intuito de verificar se este sistema apresenta algum desvio da idealidade, obtendo medidas experimentais de 18 pontos de atividade química nas temperaturas de 1100ºC e 1300ºC. Neste trabalho Hahn et Muan concluíram que a solução sólida MgO-NiO é ideal [9]. Em 1971, Evans e Muan avaliaram o sistema MgO-NiO através de ensaios de equilíbrio com níquel metálico e atmosfera controlada, obtendo 18 dados de atividade química do NiO na temperatura de 1400ºC.…”

Thermodynamic modeling of the NiO–SiO2, MgO–NiO, CaO–NiO–SiO2, MgO–NiO–SiO2, CaO–MgO–NiO and CaO–MgO–NiO–SiO2 systems

“…Thermodynamic properties of solid MgO-NiO monoxide solution have been determined using a calorimetry, 54,57 gas equilibration, [58][59][60] or EMF technique. 55,61-66 However, a considerable inconsistency is found between the experimental results.…”