Preparation and electrical characterization of ultra-fine powder scandia-stabilized zirconia

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• 作者：Jing ZHOU ((周 静)) ; He ZHANG ((张 赫)) ; Hong XU ((徐 宏)) ; Qiannan XUE ((薛倩楠)) ; Xiaowei HUANG ((黄小卫)) ; Zongyu FENG ((冯宗玉)) ; ^{fengzongyu1120@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhiqi LONG ((龙志奇))
• 关键词：scandia-stabilized zirconia ; ScSZ ; precursor ; pH ; electrical conductivity ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：34
• 期：2
• 页码：181-186
• 全文大小：787 K

文摘

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 pH 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 ScSZ 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 ScSZ 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 mS/cm in air measured at 850 °C.