The Gd 2 O 3 - GdSrFeO 4 pseudo -binary phase diagram.

The Gd2 O3 - GdSrFeO4 pseudo-binary phase diagram is presented for the first time. The liquidus and eutectic temperatures, metatectic points of the Gd2 O3 transformations in the Gd2 O3 - GdSrFeO4 section were defined using the Schröder-Le Chatelier equation, neglecting the effect of the isobaric heat capacity. The calculations were based on experimental data on the melting points of the end-members and the eutectic composition. From the results of phase relationships studies (subsolidus and high temperature region including literature data as well) and the above approach the Gd2O3-GdSrFeO4 pseudo-binary phase diagram in the temperature range 1400-2410 °C in air was constructed. It was shown that GdSrFeO4 of the K2 NiF4 - type is stable from 1100°С to a congruent melting temperature of 1560°С in air. The Gd2 O3 - GdSrFeO4 system is eutectic with no intermediate compounds.