(1. 北京大学 化学与分子工程学院, 北京 100871;
2. 东北大学 材料与冶金学院， 沈阳 110004)
摘 要: 以Y(NO3)3和NH4HCO3为原料， 采用正向滴定法， 得到了化学组成为Y2(CO3)3·2H2O的先驱沉淀物。结果发现： 时效可使沉淀物的颗粒尺寸和形状发生明显变化， 时效48 h后， 先驱沉淀物形状由球形变为针状； 先驱物经水洗-乙醇清洗-丙酮清洗可提高Y2O3粉体的活性；针状先驱物在1 100 ℃下煅烧4 h能得到团聚轻的Y2O3粉体， 粉体平均粒径约为80 nm； 所得粉体在1 700 ℃真空烧结4 h后， 获得了透明Y2O3陶瓷。
关键字: Y2O3； 纳米粉； 碳酸盐沉淀法； 透明陶瓷； 光学性能
transparent Y2O3 ceramics by carbonate-precipitation process
（ 1.College of Chemistry and Molecular Engineering,
Peking University, Beijing 100871, China;
2. School of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China）
Abstract: A carbonate precipitation process for synthesizing nanocrystalline yttria powder and transparent yttria ceramics was investigated. In this process Y(NO3)3 and NH4HCO3 were ultitized to precipitate a carbonate precursor with chemical composition of Y2(CO3)3·2H2O. It is found that aging has a dramatic effect on the morphology and size of the precipitation precursor. After aging for 48 h, yttrium carbonate with a needle-like structure is formed. Employing distilled water, ethanol, and acetone washing process on the precipitation precursor, sinterability of the yttria powder can be enhanced. Yttria powders with good dispersion and a primary particle diameter of 80 nm are produced by calcining the needlelike precursor at 1 100 ℃ for 4 h. Transparent yttria ceramics are fabricated by vacuum sintering at 1 700 ℃ for 4 h.
Key words: Y2O3；nanopowder; carbonate-precipitation；transparent ceramics；optical properties
