Synthesis and characterization of LaPO 4-coated α-Al 2O 3 powders

• Published in: Ceramics international Vol. 35; no. 2; pp. 897 - 900
• Main Authors: Zheng, Qiuju, Wang, Xin, Tian, Jintao, Liu, Zifeng, Huang, Chuanshun, Wang, Jing, Xu, Jihui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2009
• Subjects: A. Powders: chemical preparation; B. Composites; C. Chemical properties; Heterogeneous nucleation processing; A. Powders: chemical preparation; B. Composites; Heterogeneous nucleation processing; C. Chemical properties
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2008.03.014

LaPO 4-coated α-Al 2O 3 powders were successfully synthesized through the heterogeneous precipitation method. The coated powders were characterized by XRD, TEM, EDS, and zeta-potential measurements. According to the XRD results, the coated powders consisted of only α-Al 2O 3 and monoclinic LaPO 4. The TEM examinations and EDS analysis showed that under alkaline condition a homogeneous coating with thickness of ∼10 nm was obtained on the α-Al 2O 3 powder surface. The zeta-potential measurements showed the coated powders to have a pH value of 7.85 at isoelectric point, similar to that of LaPO 4 (pH value of 8.21). This was in good agreement with the TEM and EDS results, indicating a successful coating process in our experiment.