Coprecipitation synthesis and sintering property of (YbxSm1−x)2Zr2O7 ceramic powders
Authors: Z.-G. Liu, J.-H. Ouyang, Y. Zhou, X.-L. Xia
Source: Advances in Applied Ceramics
Publisher: Maney Publishing
Abstract:
(YbxSm1−x)2Zr2O7 (0≤x≤1.0) ceramic powders were synthesised with chemical coprecipitation and calcination method. Thermal decomposition behaviour of precipitates was studied by differential scanning calorimetry-thermogravimetry. The powders were characterised by X-ray diffractometry, scanning electron microscopy and transmission electron microscopy with energy dispersive spectroscopy. The synthesised powders have a particle size of about 100 nm, and exhibit to a certain extent agglomeration. The sintering behaviour of (YbxSm1−x)2Zr2O7 powders was studied by pressureless sintering method at 1550–1700°C for 10 h in air. The relative densities of (YbxSm1−x)2Zr2O7 ceramics increase with increasing sintering temperature, and reach above 95% when sintered at 1700°C for 10 h in air. Sm2Zr2O7 and (Yb0.1Sm0.9)2Zr2O7 ceramics have a pyrochlore structure; however, (YbxSm1−x)2Zr2O7 (0.3≤x≤1.0) ceramics exhibit a defective fluorite type structure.Document Type:
DOI: 10.1179/174367609X422225
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