柠檬酸络合法制备(Y_(1-x)La_x)_2O_3亚微米粉体及其物相与形貌表征  

The Phase and Morphology of (Y_(1-x)La_x)_2O_3 Submicron Powders Prepared by the Citrate Method

作　　者：张晓婷 赵森龙 王焕平 陈雅倩 杨清华 雷若姗 徐时清 

机构地区：[1]中国计量大学材料科学与工程学院,浙江杭州310018

出　　处：《陶瓷学报》2017年第6期815-821,共7页Journal of Ceramics

基　　金：浙江省自然科学基金(LZ14B010001)

摘　　要：以硝酸钇、硝酸镧、柠檬酸、乙二醇以及去离子水为原料,采用柠檬酸络合法制备(Y_(1-x)La_x)_2O_3粉体,研究了不同煅烧温度下粉体物相与形貌的变化规律。结果发现,La_2O_3的加入有细化粉体颗粒的作用,且随着La_2O_3添加量的增加,细化效果越明显;La_2O_3固溶入Y_2O_3中引起了晶格畸变,并使(Y_(1-x)La_x)_2O_3的晶格常数随着溶质含量的增加而逐渐增大;La_2O_3在(Y_(1-x)La_x)_2O_3中的固溶度随着粉体煅烧温度的升高而逐渐下降,其固溶度从1000℃时的不低于0.3下降至1400℃时的0.2;当添加过量的La_2O_3时,出现了第二相La YO_3相,引起了粉体颗粒的异常长大,并在1300℃出现了液相。当x值为0.1-0.2时,1100℃煅烧后获得了粒径50-100 nm的亚微米粉体。The （Y1-xLax）2O3 submicron powders were prepared by the citrate method using Y（NO3）3·6H2O, La（NO3）3·6H2O, citric acid, ethanediol and deionized water as the raw materials, and the phase and morphology of the powders under different calcination temperature were discussed. The results showed that the addition of La2O3 can refine the powders of （Y1-xLax）2O3, and the particles gradually become small with the increase of the solute content of La2O3 in （Y1-xLax）2O3. The value of the solid solubility decreased with the increase of the calcination temperature, and the solid solubility was 0.3-0.4 and 0.2 as the calcination temperature was 1000℃ and 1400℃, respectively. The excessive La2O3 addition led to the emergence of the second phase of LaYO3, which resulted in the abnormal powder particles growing up and the liquid phase at 1300℃. When the x value was between 0.1 and 0.2, the （Y1-xLax）2O3 submicron powders with diameter of 50-100 nm were acquired as the calcination temperature was 1100℃.

关 键 词：柠檬酸络合法 (Y1-xLax)2O3 物相 形貌 固溶度 

分 类 号：TQ174.75[化学工程—陶瓷工业]