铋钼青铜单晶的制备和结构分析

介绍了利用Bi_2O_3和MoO_3制备高质量紫色Bi-Mo-O单晶的电化学方法．能谱分析给出该单晶的化学式为Bi_(0.19)MoO_3,X射线衍射得到该单晶具有正交对称性,空间群为P_(mmma),晶胞参数为:a＝1.9985nm,b＝0.4085nm,c＝1.4437nm．X射线光电子能谱分析揭示在价带顶附近存在着一个窄的成键能带,Mo-3d芯能级谱含有Mo~(5 )和Mo~(6 )的特征。

PREPARATION AND STRUCTURE INVESTIGATION OF BISMUTH MOLYBDENUM OXIDE SINGLE CRYSTAL

By use of the electrolytic reduction of molten salt of Bi2O3-MoO3, large size and high quality single crystal of Bi-Mo-O was successfully grown. X-ray powder diffraction shows that the space symmetry is orthorhombic, the space group is Pmma,the unit cell parameters respectively are:a = l. 998 5 nm,b = 0. 408 5 nm,c = l. 443 7 nm. X-ray photoemiss-sion spectroscopy study shows that the general feature of the valence band spectra is similar to that of the cpmpounds xomtaining molybdenum oxide octahedras and is in accord with the model of molecular orbital presented by travaglini, besides there is a narrow bonding band near by the top of the valence band. The structure of two peaks of O-1s is due to Contribution from Mo-O bonds and Bi-O bonds. The line shape of Bi-4/ veveals that the valent srate of Bi ions is 3. The Mo-3d core-electron spectrum has two components of binding energies in-dentified with Mo5 and Mo6 ion,and has an asymmetric long tail dominated by the final-state effect.