Spindle-like Y4.67(SiO4)3O apatite crystallites composed of numerous nanoparticles with a mean diameter of about 50 nm were synthesized via a facile hydrothermal method at 503 K for 12 h. To the best of our knowedge, the thermal properties of the spindle-like Y4.67(SiO4)3O apatite crystallites was firstly reported. Their phase compo-sition, microstructure, formation mechanism were investigated. Results show that hydrothermal temperature greatly influences the crystal phase composition and the crystal morphology. In addition, the obtained Y4.67(SiO4)3O ce-ramics possess low thermal conductivity and a relatively high thermal expansion coefficient, which make them a promising candidate material for environmental/thermal barrier coatings.%采用水热法在温度为503 K,反应时间为12 h的条件下制备了纺锤型磷灰石相Y4.67(SiO4)3O微晶,该微晶由粒径约为50 nm的颗粒组成.首次报道了纺锤型磷灰石相Y4.67(SiO4)3O微晶的热性能,同时研究了其相组成,微观结构及合成机理.结果表明,水热温度对所制备粉体的相组成及形貌有较大影响.此外,对应的陶瓷具有较低的热导率和较高的热膨胀系数,有望用作热障/环障涂层材料.
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