Preparation and thermophysical properties of Sm 2 YbTaO 7 and Sm 2 YTaO 7
Source abstract
Abstract
Abstract Sm 2 YbTaO 7 and Sm 2 YTaO 7 ceramics were synthesized by solid reaction method at 1600 °C for 10 h. Crystal phases have been identified by X-ray diffraction, and their thermal conductivities and thermal expansion coefficients were measured using a laser flash method and the pushing-rod technology, respectively. Results indicate that Sm 2 YbTaO7 and Sm 2 YTaO 7 exhibit a typical defect fluorite-type crystal structure. Compared to Sm 2 YTaO 7 , Sm 2 YbTaO 7 has lower thermal conductivity due to the higher atomic weight difference between the substituted and substituting atoms. The thermal expansion coefficient of Sm 2 YbTaO 7 is greater than that of Sm 2 YTaO 7 due to its elongated average interionic distance. Their thermal conductivities are much lower than that of YSZ, and their thermal expansion coefficients are very close to that of YSZ. The synthesized ceramics also exhibit excellent phase stability in the temperature range from ambient to 1200 °C.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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