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Phase Equilibria in the Hafnia–Yttria–Lanthana System
Author(s) -
Andrievskaya Elena R.,
Lopato Lidiya M.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01023.x
Subject(s) - solidus , liquidus , phase diagram , differential thermal analysis , isothermal process , ternary operation , materials science , thermodynamics , phase (matter) , electron microprobe , ternary numeral system , analytical chemistry (journal) , mineralogy , crystallization , thermal analysis , solid solution , thermal , chemistry , metallurgy , diffraction , optics , physics , organic chemistry , alloy , chromatography , computer science , programming language
The HfO 2 –Y 2 O 3 –La 2 O 3 system was studied in the wide range of temperatures (1250°–2800°C) and concentrations by methods of X‐ray analysis at 20°C, petrography, differential thermal analysis in helium at temperatures to 2500°C, thermal analysis in air using a solar furnace at temperatures to 3000°C, and electron microprobe X‐ray analysis. The complete phase diagram was constructed. The liquidus and solidus projections, crystallization paths for the alloys, isothermal (1250°, 1600°, and 1900°C) and polythermal sections are presented. The structure of the boundary binary systems defines the phase equilibria in the ternary system. No ternary compounds were found. Ternary solid‐solution regions were determined based on constituent oxides and intermediate phases.