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A M  ssbauer effect study of Fe3+ bearing |
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| Authors: | LI Zhe IShinno YE Danian FU Pingqiu Zhang Yueming |
| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Graduate School of Social and Cultural Studies, Fukuoka 810, Japan 3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
| Abstract: | Three synthetic Fe3+ bearing γ-Fe2SiO4 were analyzed usingelectron probe method, and the Mssbauer spectra of the samples at 298 K, 150 K, and 95 K were measured. Each spectrum at three temperatures is composed of two doublets. These two doublets are assigned to Fe2+ in the octahedral sites and Fe3+ in the tetrahedral sites, respectively. Site occupancies were determined. The results show that Fe3+ and a small amount of Si4+ are in the tetrahedral and octahedral sites, respectively. The average bond lengths of the octahedral and tetrahedral sites were calculated according to the equations primarily given by Hill et al., O’Neill and Navrotsky and modified by the authors. Furthermore, the octahedral and tetrahedral bond lengths were used to calculate cell parameters and oxygen parameters. In addition, Fe3+ line broadening in the M?ssbauer spectra of Fe3+ bearing γ-Fe2SiO4 were interpreted by using the next nearest neighbor effects. |
| Keywords: | Fe3+ bearing iron silicate spinel Mssbauer effect bond lengths cell parameters oxygen parameters next nearest neighbor effects |
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