In situ observation of the breakdown of magnetite (Fe3O4) to Fe4O5 and hematite at high pressures and temperatures

被引：41

作者：

Woodland, Alan B. ^{[1
]}

Frost, Daniel J. ^{[2
]}

Trots, Dmytro M. ^{[2
]}

Klimm, Kevin ^{[1
]}

Mezouar, Mohamed ^{[3
]}

机构：

[1] Goethe Univ Frankfurt, Inst Geowissensch, D-60438 Frankfurt, Germany

[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[3] ESRF, F-38027 Grenoble, France

来源：

AMERICAN MINERALOGIST | 2012年 / 97卷 / 10期

基金：

欧盟第七框架计划;

关键词：

Fe4O5; magnetite; phase transformation; high pressure; X-RAY-DIFFRACTION; EQUATION-OF-STATE; PHASE; SYSTEM; STABILITY;

D O I：

10.2138/am.2012.4270

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：

In situ synchrotron X-ray powder diffraction measurements using a Paris-Edinburgh pressure cell were performed to investigate the nature of the high-pressure breakdown reaction of magnetite (Fe3O4). Refinement of diffraction patterns reveals that magnetite breaks down via a disproportionation reaction to Fe4O5 and hematite (Fe2O3) rather than undergoing an isochemical phase transition. This result, combined with literature data indicates (1) that this reaction occurs at 9.5-11 GPa and similar to 973-1673 K, and (2) these two phases should recombine at yet higher pressures to produce an h-Fe3O4 phase. Keywords: Fe4O3, magnetite, phase transformation, high pressure

引用

页码：1808 / 1811

页数：4

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