加热时间对制备钠钨青铜材料的影响

The effects of annealing time on the synthesis of sodium tungsten bronze

利用加热法,通过改变加热时间合成了不同种类的钠钨青铜(NaxWO3+x/2)材料。利用X射线衍射学和电子显微学研究确定了加热时间为4 h、10 h、30 h三种条件下的产物分别是Na2W2O7和Na2W4O13、Na2W4O13和WO3、WO3,发现产物中Na的相对含量随加热时间的增加而逐渐减小。研究结果为NaxWO3+x/2材料的制备及结构调控提供了参考。

Various sodium tungsten bronze （ Nax WO3＋x/2 ） materials were synthesized by simple heating with different annealing time. Applying the X-ray diffractometry, scanning and transmission electron microscopy, the final products were identified as Na2 W2 O7 and Na2 W4 O13 , Na2 W4 O13 and WO3 , WO3 under different annealing time of 4 h, 10 h and 30 h, respectively. It is evident that the Na content decreases with the increasing annealing time. Our results serve as a possible guidance for the synthesis of Nax WO3＋x/2 materials with controlled structures.