Subsolidus phase equilibria in the GdFeO3-SrFeO3-δ system in air. Issue 15 (15th October 2020)

• Record Type: Journal Article
• Authors: Тugova, Е.А.; Кrasilin, А.А.; Panchuk, V.V.; Semenov, V.G.; Gusarov, V.V.
• Is Part Of: Ceramics international. Volume 46:Issue 15(2020)
• Page Start: 24526
• Page End: 24533
• Publication Date: 2020-10-15
• Subjects: A. Powders: solid state reaction -- B. X-ray methods -- B. Electron microscopy -- D. Perovskites -- Solid solubility; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.06.239
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The paper considers phase equilibria in the subsolidus region of the GdFeO3 -SrFeO3-δ system in air. By using X-ray powder diffraction, SEM/EDS, and Mössbauer spectroscopy, a GdFeO3 -SrFeO3-δ phase diagram was constructed in the 1300–1500 °C temperature range. The samples of Gd1-x Srx FeO3- α for this study were synthesized by solid-phase chemical reactions. The study of phase equilibria in the GdFeO3 -SrFeO3-δ system showed the presence of three areas, that is, of solid solutions based on the strontium-poor GdFeO3 orthorhombic phase, of the strontium-rich SrFeO3-δ cubic phase, as well as of an intermediate region in the mixture of these phases. The miscibility gap width (Δ x ) decreases from 0.54 to 0.35 with an increase in temperature from 1300 to 1500 °C.