High-pressure behavior of perovskite: FeTiO_{3} dissociation into (Fe_{1-delta},Ti_{delta})O and Fe_{1+delta}Ti_{2-delta}O_{5}.
High-pressure behavior of perovskite: FeTiO_{3} dissociation into (Fe_{1-delta},Ti_{delta})O and Fe_{1+delta}Ti_{2-delta}O_{5}.
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DOI：
10.1103/physrevlett.103.065503
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发表时间：
2009-08
影响因子：
8.6
通讯作者：
Xiang Wu;G. Steinle‐Neumann;O. Narygina;I. Kantor;I. Kantor;C. McCammon;V. Prakapenka;V. Swamy;L. Dubrovinsky
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文献类型：
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作者：
Xiang Wu;G. Steinle‐Neumann;O. Narygina;I. Kantor;I. Kantor;C. McCammon;V. Prakapenka;V. Swamy;L. Dubrovinsky
钙钛矿结构材料在高压和高温下的稳定性是固态物理、化学和地球科学的根本利益所在。作为分解为氧化物或转变 CaIrO_{3} 后钙钛矿结构的替代方案，我们观察到 FeTiO_{3} 钙钛矿原位分解为超过 53 的 (Fe_{1-delta},Ti_{delta})O + Fe_{1+delta}Ti_{2-delta}O_{5} 组合体 GPa和2000 K。减压至9 GPa时，具有新结构（空间群C2/c）的Fe_{1+delta}Ti_{2-delta}O_{5}高压高温相得以保留，并在进一步泄压时发生非晶化。我们的研究表明，钙钛矿结构材料可以发生化学变化并形成具有新结构的复杂氧化物，而不仅仅是转变为更致密的多晶型物或分解为简单的氧化物。
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 CaIrO_{3} postperovskite structure, we observe in situ the breakdown of FeTiO_{3} perovskite into a (Fe_{1-delta},Ti_{delta})O + Fe_{1+delta}Ti_{2-delta}O_{5} assemblage beyond 53 GPa and 2000 K. The high-pressure high-temperature phase of Fe_{1+delta}Ti_{2-delta}O_{5} 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.