Gd₂Zr₂O₇ and Nd₂Zr₂O₇ pyrochlore prepared by aqueous chemical synthesis

详细信息    查看全文

• 作者：Linggen Kong ; Inna Karatchevtseva ; Daniel J. Gregg ; Mark G. Blackford ; Rohan Holmes ; Gerry Triani
• 关键词：Gadolinium zirconate ; Neodymium zirconate ; Pyrochlore ; Soft chemical synthesis ; Solid-state structure
• 刊名：Journal of the European Ceramic Society
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：33
• 期：15-16
• 页码：3273-3285
• 全文大小：4209 K

文摘

Pyrochlore structured Gd₂Zr₂O₇ and Nd₂Zr₂O₇ are produced via complex precipitation processing. A suite of characterization techniques, including FTIR, Raman, X-ray and electron diffraction, TEM, SEM as well as nitrogen sorption are employed to investigate the structural and grain size evolution of the synthesized and calcined powder. Results show that Gd₂Zr₂O₇ with the pyrochlore structure are produced after calcination at 1400 ¡ãC for 12 h while Nd₂Zr₂O₇ has already formed the pyrochlore structure at 1200 ¡ãC. This method allows the formation of dense materials at relatively low temperature, with bulk densities over 92 % of the theoretical values achieved after sintering at 1400 ¡ãC for 50 h. This unique aqueous synthetic method provides a simple pathway to produce pyrochlore lanthanide zirconate without using either organic solvent and/or mechanical milling procedures, making the synthesis protocol an attractive potential scale-up production of highly refractory ceramics.