Ceramics-Silikáty 17, (1) 1 - 7 (1973)

The approximative position of the ternary eutectic point and approximative temperature of the solidus in the system MgO-MgCr₂O₄-Ca₂SiO₄ were determined by a geometric construction made on the basis of linear and planar shrinkage of samples in the course of heating. By quenching method and by subsequent phase analysis the composition of eutecticum was found to be 78.3 % Ca₂SiO₄, 16.6 % MgCr₂O₄ and 5.1 % MgO and the solidus temperature of 1640 ± 5 °C was found. By measurements of the planar distribution of atoms with the electron microprobe analyzer JXA-5 the atoms Mg and Cr were found in dicalciumsilicate, Ca and Cr in periclase ancl Ca atoms in picrochromite at temperatures from 1630 to 1740 °C.