铀氧化物的氧化还原行为及其价态的X-射线光电子能谱的研究  

Study of Redox Behaviour of Uranium Oxides and Their Valence State Ratio by X-Ray Photoelectron Spectrometry

作　　者：刘世宏[1] 郭可珍[1] 胡玉秀[1] 王启标[2] 顾鼎祥[2] 沈珠琴[2] 

机构地区：[1]中国科学院化学研究所,北京100080 [2]核工业部北京地质研究院,北京100029

出　　处：《分析化学》1994年第10期984-988,共5页Chinese Journal of Analytical Chemistry

摘　　要：应用X-射线光电子能谱(XPS)对铀氧化物(UO_2、UO_3、U_3O_5)的化学态及其不同价态的相对含量(U^(4+)/U^(5+))进行了研究,结果表明.常温下 UO_2:在空气中可氧化形成 UO_(2+X)UO_3易与水结合形成水合物,在高温和高真空中易脱氧,部分U^(5+)转变成U^(4+)U_3O_2.中存在U^(4+)和U^(+5)两种价态,其相对量之比为1:2.铀氧化物中U^(4+)和U^(5+)的U4f_(7/2);.结合能相差leV左右,借助于曲线拟合技术可以对铀的不同价态的相对含量进行定量分析.The redox behaviour of uranium oxides (UO2,UO3,U3O8) and their valence state ratios (U4+/U6+)have been studied by XPS. The results indicate that UO2can be oxidized into UO2+x, in air at ambient temperature; UO3 combines with H2O to form hydrous oxide easily , and a fraction of hexavalent uranium on the surface can change into quadrivalent due to its deoxidation in high vacuum chamber at high temperature; U3O8 consists of two kinds of different valence states of uranium oxides, i. e. U4+and U6+,and the relative intensity ratio between them is 1 : 2. Although binding energy difference between U4+and U8+4f7/2 peaks of uranium oxides is about 0. 9-1. 2 eV ,quantitative analysis of relative content of different valence state of uranium can be carried out in terms of the curve fitting technique by computer.

关 键 词：铀 氧化物 氧化还原 X光电子能谱 

分 类 号：O614.62[理学—无机化学]