High-Pressure Behavior of Perovskite: FeTiO3 Dissociation into (Fe1-δ,Tiδ)O and Fe1+δTi2-δO5

被引：22

作者：

Wu, X. ^{[1
]}

Steinle-Neumann, G. ^{[1
]}

Narygina, O. ^{[1
]}

Kantor, I. ^{[1
,2
]}

McCammon, C. ^{[1
]}

Prakapenka, V. ^{[2
]}

Swamy, V. ^{[3
]}

Dubrovinsky, L. ^{[1
]}

机构：

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

[2] Univ Chicago, CARS, Chicago, IL 60437 USA

[3] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 06期

关键词：

X-RAY-DIFFRACTION; EQUATION-OF-STATE; PHASE-TRANSITIONS; TEMPERATURE; WUSTITE; MGSIO3; OXIDE; SUPERCONDUCTIVITY; POLYMORPH; IRON;

D O I：

10.1103/PhysRevLett.103.065503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The stability of perovskite-structured materials at high pressure and temperature is of fundamental interest in solid-state physics, chemistry, and the geosciences. As an alternative to decomposition into oxides or transformation of the CaIrO3 postperovskite structure, we observe in situ the breakdown of FeTiO3 perovskite into a (Fe1-delta,Ti-delta)O+Fe1+delta Ti2-delta O5 assemblage beyond 53 GPa and 2000 K. The high-pressure high-temperature phase of Fe1+delta Ti2-delta O5 with a new structure (space group C2/c) could be preserved on decompression to 9 GPa, and amorphizes under further pressure release. Our study demonstrates that perovskite-structured materials can undergo chemical changes and form complex oxides with new structures, rather than only transform to denser polymorphs or decompose to simple oxides.

引用

页数：4

共 42 条

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