The pyrite-type high-pressure form of silica

被引：133

作者：

Kuwayama, Y

Hirose, K

Sata, N

Ohishi, Y

机构：

[1] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan

[2] Japan Agcy Marine Earth Sci & Technol, Inst Res Earth Evolut, Kanagawa 2370061, Japan

[3] Japan Synchrotron Radiat Res Inst, Mikazuki, Hyogo 6795198, Japan

来源：

SCIENCE | 2005年 / 309卷 / 5736期

关键词：

D O I：

10.1126/science.1114879

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：

Silica (SiO2) exhibits extensive polymorphism at elevated pressures. X-ray diffraction measurements showed that a high-pressure form with a pyrite-type structure, denser than other known silica phases, is stable above 268 gigapascals and 1800 kelvin. The silicon coordination number increases from 6 in the alpha-PbO2-type phase to 6+2 in the pyrite-type phase, leading to a large increase in density by about 5% at the phase transition.

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页码：923 / 925

页数：3

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