微波水热时间对BiVO_4微晶相组成及显微结构的影响  

Influences of reaction time on the phase and microstructure of BiVO_4 microcrystallites prepared by microwave hydrothermal method

作　　者：黄剑锋[1] 孟岩[1] 曹丽云[1] 吴建鹏[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2012年第3期38-40,共3页Journal of Shaanxi University of Science & Technology

基　　金：陕西省自然科学基金(2010JM6001);陕西省教育厅专项项目(2010JK444);陕西省国际科技合作重点项目(2011KW-11);陕西科技大学研究生创新基金资助项目

摘　　要：以NH4VO3和Bi(NO3)3.5H2O等为起始原料,采用微波水热法可控制备了BiVO4微晶。利用X-射线衍射仪(XRD)、扫面电子显微镜(SEM)分别对产物的物相和形貌进行了表征.结果表明:在微波水热条件下,反应温度160℃时,反应30min即可制备纯的单斜相Bi-VO4微晶.随着反应时间的延长,产物由四方相向单斜相逐渐转变,产物的结晶性逐渐提高,同时由棒状微晶逐渐变成为球状微晶.BiVO4 microcrystallines with controllable morphologies were prepared by micro- wave hydrothermal method using NH4VO3 and Bi（NO3）3 · 5H2O as raw materials. The phase and morphology of as-prepared samples were characterized by X-Ray Diffraction （XRD）, Scanning Electron Microscope （SEM）. Resuhs indicate that the pure monoclinic Bi- VO4 microcrystallites can be obtained by a microwave hydrothermal method at 160 ~C within 30 minutes. As the reaction time increases, the crystallinity of products were found increas- ing with phase transition from Tetragonal to monoclinic BiVO4 structure. Correspondingly, the rod-like morphology changes to spherical structure as the hydrothermal time increasing.

关 键 词：微波水热法 BIVO4 微晶 

分 类 号：O753.1[理学—晶体学]