期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 96, 期 3, 页码 987-994出版社
WILEY-BLACKWELL
DOI: 10.1111/jace.12119
关键词
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资金
- AFOSR [FA9550-06-1-0386]
- SMART Scholarship under the National Defense Education Program of the Department of Defense, U.S.A.
- U.S. Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
The fcc-to-rhombohedral phase transformation in Ln6WO12 (Ln=Y, Ho, Er, Yb) was investigated by in situ high-temperature X-ray diffraction. The transformation was determined to be an irreversible, first-order, diffusional ordering process, which occurred over a temperature range starting at 1240 degrees C. The transformation can be described as a shape change in the rhombohedral unit cell in the parent fcc phase, determined as elongation along the [111] axis and contraction in the (111) plane, resulting in an overall volume decrease on heating. A discontinuity in both volume per formula unit and rhombohedral angle was observed across the transformation region for all four compositions. Trends in lattice parameters, V and at room and transformation temperatures were established according to Ln cation type and were found to closely mirror the cationic radii sequence of the corresponding rare earth elements.
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