Preparation of spherical nanoparticles of LaAlO₃ via the reverse microemulsion process

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• 作者：Zhongqing Tian ; Weijiu Huang ; Yijing Liang
• 关键词：Microemulsion ; Synthesis ; Nanoparticles ; LaAlO₃
• 刊名：Ceramics International
• 出版年：2009
• 出版时间：March 2009
• 年：2009
• 卷：35
• 期：2
• 页码：661-664
• 全文大小：280 K

文摘

Spherical LaAlO₃ nanoparticles in a reverse microemulsion consisting of solution (water phase), Tween-80 and Span-80 (surfactant), n-butanol (cosurfactant, and cyclohexane (oil phase) were prepared. Precursor powders and calcined powders were characterized by differential thermal analysis (DTA), thermogravimetry analysis (TG), X-ray diffraction (XRD) and transmission electron microscopy (TEM). A pure perovskite LaAlO₃ formed when the precursor hydroxides calcined at 800 °C for 2 h. The particle size was about 50 nm and the shape of the monodisperse particles is spherical. The reverse microemulsion process can dramatically lower the crystallization temperature of LaAlO₃ about 700 °C than the classical solid-state reaction method.