Preparation and electrical characterization of ultra-fine powder scandia-stabilized zirconia
来源期刊：Journal of Rare Earths2016年第2期
论文作者：周静 张赫 徐宏 薛倩楠 黄小卫 冯宗玉 龙志奇
文章页码：181 - 186
摘 要：Ultrafine powders of scandia-stabilized zirconia（ScSZ） were prepared by the co-precipitation method, using ZrOCl2 and ScO2 as raw materials and NH3·H2O as a precipitant. In this paper, the optimum process parameters were investigated. The p H of the reaction solution directly impacted the precursor structure, which further affected the obtained crystal forming. Many experiment methods of thermogravimetric analysis and differential thermal analysis（TG-DTA）, X-ray diffraction（XRD）, transmission electron microscopy（TEM）, Raman spectroscopy（Raman）, and nitrogen adsorption were employed to characterize the Sc SZ powder. The structure transition mechanism from cubic to rhombohedral was discussed. In addition, the electrical conductivity of the powders was also studied after dry-pressing and calcining. The results showed that the structure of Sc SZ with complete crystal surface belonged to the cubic phase. The crystallite sizes of the powders prepared are about 60–80 nm, meet the conditions of(D90–D10)/2D50≤1, and exhibited the good flow properties. The electrical conductivity was more than 190 m S/cm in air measured at 850 oC.
周静，张赫，徐宏，薛倩楠，黄小卫，冯宗玉，龙志奇
National Engineering Research Center for Rare Earth Materials, General Research Institute for Non-ferrous Metals, and Grirem Advanced Materials Co., Ltd.
摘 要：Ultrafine powders of scandia-stabilized zirconia（ScSZ） were prepared by the co-precipitation method, using ZrOCl2 and ScO2 as raw materials and NH3·H2O as a precipitant. In this paper, the optimum process parameters were investigated. The p H of the reaction solution directly impacted the precursor structure, which further affected the obtained crystal forming. Many experiment methods of thermogravimetric analysis and differential thermal analysis（TG-DTA）, X-ray diffraction（XRD）, transmission electron microscopy（TEM）, Raman spectroscopy（Raman）, and nitrogen adsorption were employed to characterize the Sc SZ powder. The structure transition mechanism from cubic to rhombohedral was discussed. In addition, the electrical conductivity of the powders was also studied after dry-pressing and calcining. The results showed that the structure of Sc SZ with complete crystal surface belonged to the cubic phase. The crystallite sizes of the powders prepared are about 60–80 nm, meet the conditions of(D90–D10)/2D50≤1, and exhibited the good flow properties. The electrical conductivity was more than 190 m S/cm in air measured at 850 oC.
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