物理化学学报Issue(11)：1979-1986,8.DOI:10.3866/PKU.WHXB201409251
非晶态镍硼酸盐结构的EXAFS研究
EXAFS Study of the Structure of Amorphous Nickel Borate
摘要
Abstract
In this work, two amorphous hydrated nickel borates were synthesized with nickel chloride hexahydrate and borax as reactants at mole ratios of 1:2 and 1:8, respectively. The chemical compositions of these nickel borates were determined to be NiO∙0.8B2O3∙4.5H2O and NiO∙B2O3∙3H2O through thermogravimetry-derivative thermogravimetry (TG-DTG) and chemical analysis, in which the main anions were determined to be B3O3(OH)52-and B2O(OH)62-, respectively, by Raman spectroscopy. The local structure of these samples was studied by synchrotron radiation extended X-ray absorption fine structure (EXAFS). Based on the processing and fitting of the EXAFS experimental data, the neighboring coordination atoms type, the interatomic distances, and the atom-pair numbers of Ni were determined. The fitting results of the amorphous nickel borate show that the local structure around the Ni atom has a similar structure to that of the Ni3B2O6 crystal. The neighboring coordination atoms of Ni in these amorphous nickel borates are O, B, and Ni. For NiO∙0.8B2O3∙4.5H2O, the interatomic distances for Ni―O, Ni―B, and Ni―Ni are 0.208, 0.263, and 0.311 nm, and the atom-pair numbers are 5.7, 3.8, and 3.8, respectively. The interatomic distances of NiO∙B2O3∙3H2O are 0.207, 0.262, and 0.310 nm, and the atom-pair numbers are 6.0, 4.0, and 4.0, respectively. The first shel s of Ni2+in NiO∙0.8B2O3∙4.5H2O and NiO∙B2O3∙3H2O are octahedral with six oxygen atoms.关键词
硼酸镍/氢氧化镍/扩展X射线吸收精细结构/局域结构/配位原子Key words
Nickel borate/Nickel hydroxide/Extended X-ray absorption fine structure/Local structure/Coordination atom分类
化学化工引用本文复制引用
刘红艳,房春晖,房艳,周永全,朱发岩,戈海文,杨子祥,唐玉玲..非晶态镍硼酸盐结构的EXAFS研究[J].物理化学学报,2014,(11):1979-1986,8.基金项目
国家自然科学基金项目(21373251)和中国科学院知识创新工程重要方向项目(KZCX2-EW-307)资助 （21373251）
