纳米氧化铋基材料高温相变的研究  

Phase transition of nano Bi_2O_3-based materials at high temperature

作　　者：李榕[1] 甄强[1] 郭曙强[1] 石刚[1] Rose-Noelle VANNIER Michel DRACHE 

机构地区：[1]上海大学鹏材料科学与工程学院,上海200444 [2]法国里尔科技大学国家高等化学学院晶体化学及固体物理化学实验室

出　　处：《功能材料》2006年第11期1828-1831,1834,共5页Journal of Functional Materials

基　　金：国家自然科学基金(20101006)上海市纳米专项基金(0452nm073)

摘　　要：以分析纯Bi(NO_3)_3·5H_2O和Y(NO_3)·6H_2O为原料制备纳米β-Bi_2O_3和Bi_2O_3-Y_2O_3(75% (摩尔分数)Bi_2O_3+25%(摩尔分数)Y_2O_3)粉体,平均粒度分别为40和30nm。经TG-DTA、高温XRD以及高温拉曼的研究结果表明。亚稳态的纳米β-Bi_2O_3粉体在升温过程中于420℃先向低温稳定的α-Bi_2O_3转变,在720℃时向δ-Bi_2O_3相转变,降温过程则是由δ→p→α。由于纳米Bi_2O_3具有很高的活性,使得相变温度比微米Bi_2O_3有所降低。蚋米Bi_2O_3-Y_2O_3复合粉体升温过程中。Y_2O_3的固溶反应在较低温度(400℃)开始,500℃时β-Bi_2O_3完全转变为δ相,同时Y_2O_3完全固溶到δ-Bi_2O_3晶体中。Y_2O_3的掺杂使得Bi_2O_3的β→δ相转变温度大幅降低。With A. R. Bi（NO3）3 · 5H2O and Y（NO3）3 · 6H2O as raw materials, nano Bi2O3 and Bi2O3-Y2O3 （75mol % Bi2 O3 ＋ 25mol % Y2O3 ） powders were prepared and the average grain sizes were less than 4O and 3Onm, respectively. The study results of TG-DTA,high temperature XRD and high temperature Raman on phase transition behave of these powders showed that metastable state nanometer β-Bi2O3 transformed into stable α-Bi2 O3 at low temperature （420℃） first, then α-Bi2O3 transitioned into δ- Bi2O3 at 720℃ during the heated process; during the cooled process, phase transformation process was δ-β-α, because nano-Bi2O3 has higher activity which lead to lower transition temperature than micron-Bi2O3. The solid solution reaction of Y2O3 and β-Bi2O3 started at lower temperature （400℃） during the process of heated mixed nano Bi2O3-Y2O3 powder, b-Bi2O3 had almost completely transformed into δ-Bi2O3 at 500℃ and the solid solution reaction turned to end. The β→δ phase transformation temperature was lowered obviously by doping of Y2O3.

关 键 词：纳米氧化铋 纳米氧化铋氧化钇 高温相 变 高温拉曼光谱 

分 类 号：O646.1[理学—物理化学]