Abstract
Limits of substitution of manganese in Ca 3SiO 5 and Ca 2SiO 4 have been determined in air and in reducing atmosphere (93% CO 2, 7% CO) at 1350°C. The substitution reaches 0.72% and 2.54% Mn in Ca 3SiO 5 respectively, while in Ca 2SiO 4 the corresponding limits are 1.53% and 2.34%. In air, Mn substitutes as Mn 4+, mainly for Si, while in CO 2/CO, more isomorphous replacement of Ca 2+ by Mn 2+ occurs. The effect of Mn on the silicate-phase polymorphism is described, and IR patterns given for the solid solutions.
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