【摘要】 利用简单的低温共沉淀方法成功制备出直径7⁹μm的四方相钒酸铋（BiVO₄）微球,通过对制备的四方相BiVO₄微球在500℃退火10h,四方相BiVO₄成功转变为单斜相BiVO₄,且形貌和尺寸都没有明显变化。用X射线粉末衍射和扫描电子显微镜技术对所制备的微米晶的成分、形貌和尺寸进行了表征。对BiVO₄微球的晶相转变因素作了深入的讨论。提出了一种晶相、形貌和尺寸可控的BiVO₄微球的制备新方法。更多还原

【Abstract】 Pure tetragonal BiVO₄ microspheres with diameter of 7⁹μm were prepared successfully by a simple lowtemperature coprecipitation method.The pure monoclinic BiVO₄ microspheres,which had the same morphology and diameter as tetragonal BiVO₄ microspheres,were achieved by annealing tetragonal BiVO₄ microspheres at 500℃ for 10 h.XRD and SEM techniques were used to study crystalline phases,morphology and size of obtained BiVO₄ microspheres.On the basis of annealing temperature,the transformation mechanism between tetragonal and monoclinic phase BiVO₄ microspheres was discussed in detail.The work developed a facile and new route for the synthesis of BiVO₄ microspheres with controllable crystalline phases,morphology and size.更多还原