U(DBM)_4,U(TFBA)_4和渗杂U(Ⅳ)的Th(DBM)_4,Th(TFBA)_4单晶中U(Ⅳ)的光谱研究

SPECTROSCOPY STUDY OF U (Ⅳ) DILUTED IN Th (DBM), Th (TFBA), SINGLE CRYSTALS.

摘要: <正> 本工作成功地制备了U(DBM)_4,U(TFBA)_4单晶和渗杂U(Ⅳ)的Th(DBM)_4,Th(TFBA)_4单晶(DBM为二苯酰甲烷,TFBA为4,4,4三氟-1-苯基-1,3丁二酮)。其DBM单晶是平行六面体,极不稳定,在光和热的作用下很易氧化和分解。结晶学研究表明,单晶中含有苯分子,是一种“溶剂化物”。其TFBA单晶是轻度畸变的反四棱锥体,性能稳定,位置对称是S_4。

Abstract: The single crystals of U(DBM)4, U (TFBA)4 and Th (DBM)4, Th(TFBA), doped U (Ⅳ) are successfully prepared and their abosorption spectrum are measured at 4-300K, between 4000?20000 A region. The absorption spectrum are given. The real symmetry site of U(Ⅳ) is C2 in Th (DBM)4 and S4 in Th(TFBA)4 respectively. Because of the existance of the vibronic, it is difficult to index the absorption spectrum.