High-Pressure Behavior of Perovskite: FeTiO[subscript 3] Dissociation into (Fe[subscript 1-delta]Ti[subscript delta])O and Fe[subscript 1+delta]Ti[subscript 2-delta]O[subscript 5]
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{sub 3} postperovskite structure, we observe in situ the breakdown of FeTiO{sub 3} perovskite into a (Fe{sub 1-{delta}},Ti{sub {delta}})O+Fe{sub 1+{delta}}Ti{sub 2-{delta}}O{sub 5} assemblage beyond 53 GPa and 2000 K. The high-pressure high-temperature phase of Fe{sub 1+{delta}}Ti{sub 2-{delta}}O{sub 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1005858
- Journal Information:
- Phys. Rev. Lett., Vol. 103, Issue (6) ; 08, 2009; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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