摘要
本文根据特征离子坐标变化的特点，对黄铁矿型结构的微变规律性进行了讨论，作了一些规律图。总结出；成分的变化控制着u值的变化，u值的变化影响着晶体结构的微变化。u值发生变化，MX6反三方柱的顶面和底面会沿3轴相向或相背移动，u值增加愈接近正八面体。u值发生变化，X（M3X）三方锥底面的方位不变，但锥顶（X7）和锥体内的（X1）的坐标要变化，它们会沿着雄的中轴线相向或相背移动，形成扁平型的三方锥。最后得出：当成分变化时，X离子的移动是按照X＝Y＝Z的直线方程进行的。
This paper discusses the microvaried regularities of the pyrite-type crystal structures, interrns of the characterized ion coordinate and also discusses the move orbit of X ion during the com-posit ion change.The sites occupled by M cations in the pyrite unit cell are the special sites. These sites aretherefore fixed. The oxygen, on the other hand, occupies the general sites. Only one parameter,conventionally called u, needs to be determined. As the composition or temperature changes, onlythe coordinate of X lons will change, which would cause the change of whole structure.Some diagrams are presented, including the diagrams of correlation between the u value andthe (M -X) / α, φ value. In the diagrams the projection points fall in 3 reglons according to u val-ues, and they are controlled by the size of M cations.
出处
《矿物学报》
CAS
CSCD
北大核心
1996年第4期423-430,共8页
Acta Mineralogica Sinica
基金
国家自然科学基金!49372091
关键词
黄铁矿
晶体化学
结构微变
离子坐标法
pyrite
crystal chemistry
structure microvariation
move orbit
