【摘要】 架状硅酸盐的氧平均体积与晶体结构有如下关系:V_o=a+bf（s）。对于每种结构类型而言,a和b是常数。f（s）是结构函数,它取决于离子半径、离子电价以及类质同象替代关系。文中给出了长石型、白榴石型、鳞石英型以及β石英型架状硅酸盐的V₀与结构函数之间的定量关系。沸石中虽含有大量水,但其V_o并未增大,平均值为22.25A³,标准方差σ_n-1=0.82A³,与石英玻璃V_o值近于相等。更多还原

【Abstract】 The oxygen-shared volume of a framework silicate mlneral （V_o value） iscalculated to be: V_o=V（the unit-cell volume）/∑_o（the total number of oxygen and water in the unit cell） In this paper a new concept, the structural function, is introduced by theauthors, It is defined as: f（s） （structural function）=sub from m to （m×r）/∑_o×R_t/0.39×T/T+Si, where m, r and e are the number, radius and valence, respectively, of the non-framework cation, R_t is the radius of the cation T substituting for siliconT/（T+Si） is the occupancy of T, and 0.39A is the radius of Al³⁺. The V_o values of framework silicate minerals are linearly correlated withtheir structural functions, i.e.; V_o=a+bf （s）,where a and b are constants for a certain structural type of framework silica-tes, and a corresponds to the V_o value of a certain silica polymorph. V_o=16. 52+151. 0f（s） r=0.989 （feldspar group） V_o=21. 59+20. 10f（s） r=0.947 （tridymite group） V_o=20. 18+29. 81f（s） r=0.92 （β-quartz group） V_o=21. 49+48. 17f（s） r=0.951 （leucite group） Though zeolitic minerals contain much water, their V_o values do not incr-ease, the mean value being 22. 25 A³ with б_n-1=0. 82 A³, which is approximatelythe same as that of silica glass.更多还原