X線吸収端微細構造分析法による酸性水溶液中のジルコニウム(IV)の局所構造の研究(<特集>無機材料分析のためのスペクトロメトリー)

概要

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A change of the local structure for zirconium (IV) in acidic aqueous solution was observed by an extended X-ray absorption fine structure (EXAFS) analysis. A synchrotron radiation beam was used as the X-ray source. Based on the tetranuclear structure, [Zr_4 (OH)_8・16H_2O] Cl_8 (Zr-O ; 214.2 pm, Zr-Zr ; 355.9 pm) elucidated from an XRD data of ZrCl_2O・8H_2O single crystal, the EXAFS spectra were analyzed and discussed. When 0.1 M Zr (IV) solution was aged more than 12 d after the dissolution of ZrCl_2O・8H_2O, the zirconium (IV) species in the solution was assigned to the hydrolyzed polynuclear {[Zr_4 (OH)_x]^<(16-x)+>}_n, (x ≃ 12) (Zr-O ; 214 pm, Zr-Zr ; 361 pm). The analysis of the EXAFS spectrum obtained 1 h later after the preparation suggested that the radical hydrolyzed species [Zr_3 (OH)_y]^<(12-y)+>(y ≥ 10) (Zr-O ; 221 pm, Zr-Zr ; 350 pm) was produced. It was also proposed that when the hydrochloric acid was increased, another trinuclear complex [Zr_3 (OH)_z]^<(12-z)+> (z=4 or 5) was produced (Zr-O ; 217 pm, Zr-Zr ; 350 pm).
社団法人日本分析化学会の論文
1986-08-05