Sintering and electrical properties of coprecipitation prepared Ce0.8Y0.2O1.9 ceramics
作者： Yunfeng Gu , Gang Li , Guangyao Meng , Dingkun Peng
DOI: 10.1016/S0025-5408(00)00205-1
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摘要: Abstract Fine Ce0.8Y0.2O1.9 (YDC) powders were prepared by a chemical coprecipitation process. The effect of the calcination temperature on sinterability and electrical conductivity resulting YDC ceramics was investigated. Broadening degrees X-ray peaks indicate that crystallite sizes significantly increase with from 500 to 1000°C, which is consistent transmission electron microscopy (TEM) results. Scanning (SEM) photographs surface microstructures revealed calcined at temperatures 500–750°C become highly dense (over 98% theoretical density) when sintered 1500°C, while ceramic 1000°C reached only 93% relative density. On other hand, average grain size specimens obtained increasing decreased 2.5 1 μm, correspondingly. These results are attributed high sintering activity growth rate same condition for finer lower temperature. measurement ac impedance spectroscopy shows specimen powder 750°C exhibits highest conductivity, approximately 4 Sm−1 in air.
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