标题：Partial wet route for YAG powders synthesis leading to transparent ceramic: A core-shell solid-state reaction process
作者：Yuanhua Sang;Haiming Qin;Hong Liu
作者机构：State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;State Key Laboratory of Crystal Materials, S
来源：Journal of the European Ceramic Society
关键词：Partial wet route;Y_3Al_5O_(12);Transparent ceramic;Core-shell structure
摘要：Synthesis of Y_3Al_5O_(12) (YAG) powders respectively presents morphology control and chemical stoichiometry problems when employing the solid-state reaction or the wet-chemical route. YAG powder retaining the morphology of Al_2O_3 powder was designed and synthesized via a partial wet-chemical process with yttrium ions precipitating on the Al_2O_3 particles. The formation process of the Y-compound/Al_2O_3 core-shell structure is discussed on the basis of zeta-potential measurements and HRTEM results. Two stages, including direct precipitation at the surface of the Al_2O_3 particles and the assembly of the yttrium precipitate from explosive nucleation onto the yttrium compound-coated Al_2O_3 particles, are proposed. A spherical surface reaction process is illustrated. A pure YAG phase can be realized at a temperature about 300 °C lower than that of the traditional solid-state reaction process.