STRUCTURE AND DENSITY OF FES AT HIGH-PRESSURE AND HIGH-TEMPERATURE AND THE INTERNAL STRUCTURE OF MARS

被引：152

作者：

FEI, YW ^{[1
]}

PREWITT, CT ^{[1
]}

MAO, HK ^{[1
]}

BERTKA, CM ^{[1
]}

机构：

[1] CARNEGIE INST WASHINGTON, CTR HIGH PRESSURE RES, WASHINGTON, DC 20015 USA

来源：

SCIENCE | 1995年 / 268卷 / 5219期

关键词：

D O I：

10.1126/science.268.5219.1892

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In situ x-ray diffraction measurements revealed that FeS, a possible core material for the terrestrial planets, transforms to a hexagonal NiAs superstructure with axial ratio (c/a) close to the ideal close-packing value of 1.63 at high pressure and high temperature. The high-pressure-temperature phase has shorter Fe-Fe distances than the low-pressure phase. Significant shortening of the Fe-Fe distance would lead to metallization of FeS, resulting in fundamental changes in physical properties of FeS at high pressure and temperature. Calculations using the density of the high-pressure-temperature FeS phase indicate that the martian core-mantle boundary occurs within the silicate perovskite stability field.

引用

页码：1892 / 1894

页数：3

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