A Study of Solid‐state Reaction in the Ternary System MgO–ZrO 2 ,–SiO 2

A study has been made of solid‐state reaction at 1450°C. in the ternary system MgO–ZrO 2 –SiO 2 . Approximately 40 selected compositions have been sintered to obtain essentially complete reaction. The calcines have been analyzed by X‐ray diffraction methods, using a Norelco X‐ray spectrometer. The solid‐state compatibility relationships have been thereby established. The results are compared with those of some previous investigators. This study illustrates a general method of attack which, although old in principle, has long been neglected. It is recommended that the method be revived by ceramists and others engaged in phase equilibrium research.