Affiliation:
1. Institute of Materials Science, Freiberg University of Mining and Technology, Freiberg, Germany
Abstract
Abstract
Thermodynamic calculations in the ZrO2–La2O3–Y2O3 system were used to select compositions for experimental investigations. The selected compositions were investigated using X-ray diffraction, scanning electron microscopy combined with energy dispersive X-ray spectroscopy and differential thermal analysis after prolonged heat treatment at 1250, 1400 and 1600 °C. The X-ray diffraction investigations indicated stability of the La2O2–A + (La,Y)2O3–B + La2Zr2O7 and (La,Y)2O3–B + La2Zr2O7 + LaYO3-perovskite phase fields at 1250 °C, which is contrary to results found in the literature. The differential thermal analysis of the ZrO2-45.8La2O3-20.8Y2O3 composition heat treated at 1250 °C showed no transformations up to 1500 °C. Two peaks were indicated at temperatures above 1450 °C: the first peak at 1530 °C could be attributed to the processes of Y2O3 dissolution and disordering in the pyrochlore phase and the second peak at 1580 °C to transformation of perovskite to monoclinic B phase. The solubility of Y2O3 in pyrochlore phase occurs by Y+3 substitution of both Zr+4 and La+3 ions.
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
Cited by
9 articles.
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