Abstract
The Gd 2 O 3 – GdSrFeO 4 pseudo-binary phase diagram is presented for the first time. The liquidus and eutectic temperatures, metatectic points of the Gd 2 O 3 transformations in the Gd 2 O 3 – GdSrFeO 4 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 GdSrFeO 4 of the K 2 NiF 4 - type is stable from 1100°С to a congruent melting temperature of 1560°С in air. The Gd 2 O 3 – GdSrFeO 4 system is eutectic with no intermediate compounds.