BULK MODULUS-VOLUME RELATIONSHIP FOR CATION-ANION POLYHEDRA

被引:206
作者
HAZEN, RM
FINGER, LW
机构
来源
JOURNAL OF GEOPHYSICAL RESEARCH | 1979年 / 84卷 / NB12期
关键词
D O I
10.1029/JB084iB12p06723
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A bulk modulus-volume relationship is demonstrated for cation coordination polyhedra in a variety of structure types including oxides, silicates, halides, sulfides, phosphides, and carbides. The bulk modulus of a substance depends on the bulk moduli of component polyhedra and the manner in which these polyhedra are linked. In corner-linked structures, such as quartz and framework silicates, mineral bulk moduli are significantly less than those of constituent corner-linked polyhedra, because of accommodations resulting from changes of the metal-oxygen-metal angles. In layer structures such as micas, with extensive edge sharing within the layers but weak bonds between the layers, compression is highly anisotropic. Structures such as periclase, spinel, and garnet, with extensive edge sharing between polyhedra in three dimensions, have large bulk moduli similar to those of constituent polyhedra. Bulk moduli of mantle mineral phases approximate the moduli of component polyhedra because most mantle mineral structure types have edge sharing in three dimensions. Compression for a given polyhedron does not appear to depend upon the linkage topology of the structure.
引用
收藏
页码:6723 / 6728
页数:6
相关论文
共 28 条