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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Local structure and redox state of vanadium in vanadium strontium borate [(V_2O_5)_(0.5)(SrO)_(0.5-y)(B_2O_3)_y] oxide glasses
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Local structure and redox state of vanadium in vanadium strontium borate [(V_2O_5)_(0.5)(SrO)_(0.5-y)(B_2O_3)_y] oxide glasses

机译：硼酸锶锶[[V_2O_5）_（0.5）（SrO）_（0.5-y）（B_2O_3）_y]氧化物玻璃中钒的局部结构和氧化还原态

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摘要

The local structure of vanadium strontium borate glasses with the nominal composition [(V_2O_5)_(0.5)(SrO)_(0.5-y)(B_2O_3)_y],where 0.1<=y<=0.4,as well as the valence state of the vanadium ions have been investigated by x-ray photoelectron spectroscopy(XPS).The core level binding energies of V 2p,Sr 3p,B 1s and O 1s have been measured.It was observed that there is a small increase in binding energies of the doublet peaks attributed to Sr 3p_(3/2)and Sr 3p_(1/2)in the Sr 3p spectra with an increase in the B_2O_3 content and also shifted by ~ 0-6 eV towards higher binding energies in comparison to their values in SrO powder.The binding energies of the B Is peak positions increase with an increase in the B_2O_3 content,have essentially the same FWHM but,in comparison to B_2O_3 powder,the peak positions have shifted towards lower binding energy side by ~0.7 eV.The O 1s core level spectra,however,show asymmetry for all glass samples which results from two contributions,one from the presence of oxygen atoms in the V-O-V,V-O-B,B-O-B environment(bridging oxygen BO)and the other from oxygen atoms in V-O-Sr,B-O-Sr,V-O,environment(non-bridging oxygen NBO).The O 1s core level spectra were deconvoluted into two peaks(BO and NBO)and the ratio of NBO to total oxygen was found to decrease with increasing B_2O_3 content.The quantitative ratio,[V~(4+)/V_(total)],for each glass sample,has been determined from the analysis of the V 2p core level spectra.The ratio remains practically constant,independent of vanadium concentration within experimental uncertainties.
机译：标称成分为[（V_2O_5）_（0.5）（SrO）_（0.5-y）（B_2O_3）_y]的硼酸钒锶玻璃的局部结构，以及化合价态X射线光电子能谱（XPS）研究了钒离子的含量，测定了V 2p，Sr 3p，B 1s和O 1s的核心能级结合能，观察到结合能的增加很小Sr 3p光谱中归因于Sr 3p_（3/2）和Sr 3p_（1/2）的双峰峰中，B_2O_3含量增加，并且与它们的结合能相比，向更高的结合能偏移〜0-6 eV B的结合能随B_2O_3含量的增加而增加，具有相同的FWHM，但与B_2O_3粉末相比，峰值位置向着较低的结合能侧偏移了〜0.7 eV。但是，O 1s核心能级谱显示出所有玻璃样品的不对称性，这是由两种贡献引起的，一种是由于存在VO-Sr，BO-Sr，VO，环境（非桥接氧NBO）中的VOV，VOB，BOB环境中的氧原子（桥接氧BO）和其他氧原子。对O 1s核心能级谱进行反卷积进入两个峰（BO和NBO），发现NBO与总氧的比率随B_2O_3含量的增加而降低。每个玻璃样品的定量比[V〜（4 +）/ V_（total）]为通过对V 2p核能级谱的分析确定。该比值实际上保持恒定，与实验不确定性范围内的钒浓度无关。

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