Ceramics-Silikáty 23, (2) 97 - 102 (1979)

Observations of samples prepared of MgO monocrystals, sintered CaO, and heated jointly without coming into mutual contact have shown that CaO melts at lower temperature than MgO. In three repeated CaO melting temperature measurements, the following values were determined: 2631, 2607, 2612 °C. Similarly for MgO: 2803, 2826, 2841 °C. On the basis of these values and on that of an analysis of errors in their determination the final suggested values for CaO an MgO are 2617 ± 30 °C and 2823 ± 40 °C respectively.