pH 值对微波水热法制备 MnWO4微晶形貌的影响  

Effect of pH Value on Morphology of MnWO_4 Microcrystallites Prepared by Microwave Hydrothermal Method

作　　者：周森[1] 黄剑锋[1] 曹丽云[1] 张婷[1] 费杰[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,西安710021

出　　处：《硅酸盐学报》2012年第9期1327-1330,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(50962047);陕西省教育厅自然科学专项基金项目(2010JK444,09JK36,11JK0820);陕西科技大学研究生创新基金资助项目

摘　　要：以四水氯化锰(MnCl2 4H2O)和二水钨酸钠(Na2WO4 2H2O)为原料,采用微波水热法在不同pH值下成功制备了MnWO4微晶。利用X射线衍射和透射电子显微镜分别对产物的物相和形貌进行了表征;并对棒状MnWO4微晶的形成机理进行了初步探讨。结果表明:在pH为4.0～11.0范围内均可制备出纯相的MnWO4晶体,随着pH值的增大,产物的结晶性有所提高,晶粒尺寸逐渐增大,同时其形貌由粒状向棒状转变。MnWO4 microcrystallites were prepared by a microwave hydrothermal method at different pH values using MnCl2·4H2O and Na2WO4·2H2O as the start materials. The phase and morphology of the as-prepared samples were characterized by X-ray diffrac- tion and transmission electron microscopy. The formation mechanism of rod-like MnWO4 was proposed. The results showed that pure MnWO4 microcrystallites could be prepared in the pH value range of 4.0--11.0, and the crystallinity and grain size of products in- creased with increasing of the pH value. Correspondingly, the morphology transformed from grain-like to rod-like.

关 键 词：微波水热法 钨酸锰 微晶 

分 类 号：TQ137.12[化学工程—无机化工]