The first literary data date back to 1930, when attempts were made to study the melting diagram of the Сr2О3 — Zr02 system [1, 2]. Having discovered the significant volatility of chromium oxide, the authors abandoned further research. The results of the work are presented in Fig. 1, which shows that the data obtained cannot even be approximate. These data exhaust the literary information on the Сr2О3 — Zr02 system. Believing that the volatility of Сr2О3 in itself cannot serve as an obstacle to studying the system, since the composition of each point can be determined by chemical analysis of the fused portion of the samples, after determining the melting point, we decided to study the equilibrium diagram of this system, which is of not only theoretical but also significant practical interest.
