硅酸盐矿物中Fe^(2+)离子同质异能位移与平均有效离子半径之间的关系

RELATIONSHIP BETWEEN ISOMER SHIFTS OF Fe^(2+) IONS AND AVERAGE EFFECTIVE RADII OF IONS IN SILICATE MINERALS

同质异能位移是矿物的重要穆斯鲍尔参数之一，本文首次讨论了硅酸盐矿物中硅酸盐矿物中Fe2+离子的同质界能位移Is与离子的平均有效半径r-之间的关系，发现它们之间的关系可以用一简单线性力程IS（mm／s）=0.58r-＋0．695来表示，其相关系数R=0．93。本文还根据同质异能位移与原子核处s电子密度之间的关系，定性地解释了上述线性方程。

Mssbauer spectroscopy has been widely used to study minerals in the past thirty years.There are three lmportant Mssbauer parameters: isomer shift (IS), quadrupole splitting (QS) andhyperfine magnetic field (H). It was found that isomer shift depends on the coordination numberand oxidation state as well as the electron spin state (low spin or high spin) of iron in minerals.The relationship between isomer shifts of Fe2+ ions and average effective radii of ions in silicateminerals have been discussed for the first time. The linear equation IS (mm/s) = 0. 582r+ 0. 695can be used to express the relationship mentioned above where r is the average effective radius ofions and R is the corrclatlon coefficient equal to 0. 93. This shows that the linearity for this equa-tion is satisfying. In addition, the relationship between isomer shifts of Fe2+ ions and average ef-fective radii of ions is qualitatively explained based on s electron density at 57Fe nucleus.