(1. 北京大學(xué) 化學(xué)與分子工程學(xué)院, 北京 100871;
2. 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 以Y(NO3)3和NH4HCO3為原料， 采用正向滴定法， 得到了化學(xué)組成為Y2(CO3)3·2H2O的先驅(qū)沉淀物。結(jié)果發(fā)現(xiàn)： 時效可使沉淀物的顆粒尺寸和形狀發(fā)生明顯變化， 時效48 h后， 先驅(qū)沉淀物形狀由球形變?yōu)獒槧睿?先驅(qū)物經(jīng)水洗-乙醇清洗-丙酮清洗可提高Y2O3粉體的活性；針狀先驅(qū)物在1 100 ℃下煅燒4 h能得到團聚輕的Y2O3粉體， 粉體平均粒徑約為80 nm； 所得粉體在1 700 ℃真空燒結(jié)4 h后， 獲得了透明Y2O3陶瓷。
關(guān)鍵字: Y2O3； 納米粉； 碳酸鹽沉淀法； 透明陶瓷； 光學(xué)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
