摘要
Three synthetic Fe3+ bearing λ-Fe2SiO4 were analyzed using electron probe method, and the M?ssbauer 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 λ-Fe2SiO4 were interpreted by using the next nearest neighbor effects
三合成 Fe3+ 适用 -Fe2SiO4 用电子探查方法，和 M 被分析 ? 在 298 K， 150 K，和 95 K 的样品的 ssbauer 系列被测量。在三温度的每个系列由二件马甲组成。这二件马甲分别地在有四面的地点在八面的地点和 Fe3+ 被分到 Fe2+ 。地点占有是坚定的。结果证明 Fe3+ 和 Si4+ 的小数量分别地在有四面、八面的地点。八面、有四面的地点的平均契约长度根据希尔等， ONeill 和 Navrotsky 首先给并且由作者修改的方程被计算。而且，八面、有四面的契约长度被用来计算房间参数和氧参数。另外，在 M 拓宽的 Fe3+ 线 ? 忍受 -Fe2SiO4 的 Fe3+ 的 ssbauer
基金
the National Natural Science Foundation of China(Grant No.40072019)
the Japan Society for the Promotion of Science(JSPA)
