Thermophysical properties of $ Sm_{2} $($ Zr_{1−x} %$ Ce_{x} $)2$ O_{7} $ ceramics

Abstract $ Sm_{2} $($ Zr_{1−x} %$ Ce_{x} $)2$ O_{7} $ (x = 0.1, 0.2, and 0.3) ceramics were prepared by solid reaction method at 1600°C for 10 h using $ Sm_{2} %$ O_{3} $, $ ZrO_{2} $, and $ CeO_{2} $ as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and...
Ausführliche Beschreibung

Abstract $ Sm_{2} $($ Zr_{1−x} %$ Ce_{x} $)2$ O_{7} $ (x = 0.1, 0.2, and 0.3) ceramics were prepared by solid reaction method at 1600°C for 10 h using $ Sm_{2} %$ O_{3} $, $ ZrO_{2} $, and $ CeO_{2} $ as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and partial thermal conductivities of these materials were investigated. X-ray diffraction (XRD) results reveal that $ Sm_{2} $($ Zr_{0.9} %$ Ce_{0.1} $)2$ O_{7} $ with pyrochlore structure and $ Sm_{2} $($ Zr_{1−x} %$ Ce_{x} $)2$ O_{7} $ (x = 0.2 and 0.3) with fluorite structure were synthesized, and scanning electrical microscopy (SEM) images show that the microstructures of these products are very dense. The linear thermal expansion coefficients increase with increasing temperature in the temperature range from ambient to 1200°C, and the thermal expansion coefficients increase with increasing content of doped $ CeO_{2} $. The thermal conductivities of $ Sm_{2} $($ Zr_{0.8} %$ Ce_{0.2} $)2$ O_{7} $ and $ Sm_{2} $($ Zr_{0.7} %$ Ce_{0.3} $)2$ O_{7} $ decrease gradually with an increase in temperature. These results show that the synthesized ceramic materials can be explored as novel prospective candidate materials for use in new thermal barrier coating systems in the future. Ausführliche Beschreibung