Preparation of lanthanum cerate powders via a simple molten salt route

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• 作者：Zhong Huang ; Hongjuan Duan ; Jianghao Liu ; Haijun Zhang ; ^{zhanghaijun@wust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：La2Ce2O7 ; Molten salt ; Dissolution&ndash ; precipitation
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：10482-10486
• 全文大小：1392 K

文摘

Lanthanum cerate (La₂Ce₂O₇) powders were synthesized via a simple molten salt route using cerium oxide (CeO₂) and lanthanum oxide (La₂O₃) as raw materials, and KCl–LiCl, Na₂CO₃–K₂CO₃ and NaCl–KCl–NaF to form the reaction media. The effects of different processing parameters such as reaction temperature, salt type and salt/reactant ratio on the La₂Ce₂O₇ formation were investigated. Among the three combined salts, NaCl–KCl–NaF showed the best accelerating effect on the La₂Ce₂O₇ formation. Phase pure La₂Ce₂O₇ particles with sizes of 2–5 μm were obtained after 3 h firing at 1100 °C in NaCl–KCl–NaF using the salt/reactant ratio of 3.0:1.0. Use of an appropriately higher amount of molten salt was beneficial to the formation of finer La₂Ce₂O₇ particles. The “dissolution–precipitation” mechanism is believed to have played a key role in the synthesis process.