中文摘要：

以Y（NO3）3.6H2O和Al（NO3）3·9H2O为原料,尿素为沉淀剂,采用均相沉淀法合成了成分为5[Al（OH）CO3]·3[Y（OH）CO3]的钇铝石榴石（YAG）先驱体粉末。在沉淀过程中通过控制硫酸根离子的含量可以避免晶核生长时的方向性,有效防止了纳米颗粒硬团聚的形成,先驱体颗粒逐渐球化。经1 100℃煅烧分解,获得平均尺寸为200~400 nm、低团聚的高纯YAG球形粉体。该粉体经模压成型、1 700℃真空烧结,得到晶粒分布均匀、完全透明的YAG陶瓷。

英文摘要：

YAG precursor powders with composition of 5[AI（OH）CO3]·3[Y（OH）CO3] were prepared by a homogeneous precipitation method using Y（NO3）3·6H20 and Al（NO3）3·9H20 as the raw materials and urea as the precipitant. During the precipitation process, the hard agglomerates between the nanopowders are prevented by the electrostatic effect and the selective growth of the crystal nucleus is avoided through controlling the content of SO42- ions. The precursor powders can be spheroidized gradually during the chemical reaction. The highly pure and low-agglomerated YAG spherical powders are obtained by calcinating the precursors at 1 100℃ and the primary particles are spherical and 200-400 nm in diameter. The powder compact pressed in steel die can be sintered to transparency under vacuum at 1 700℃. The fully transparent YAG ceramics exhibit a homogeneous microstructure without any survival pores.