Phase Equilibria in the Hafnia–Yttria–Lanthana System |
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Authors: | Elena R Andrievskaya Lidiya M Lopato |
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Affiliation: | Institute of Materials Science Problems, 252142, Kiev, Ukraine |
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Abstract: | The HfO2–Y2O3–La2O3 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. |
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Keywords: | hafnium/hafnium compounds yttria lanthanum/lanthanum compounds |
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