Consequences of pressure-instigated spin crossover in RFeO₃ perovskites; a volume collapse with no symmetry modification

Summary, in English

High-pressure X-ray diffraction, Mössbauer, and Raman studies in the antiferromagnetic insulators RFeO₃ orthorhombic perovskites (R = Pr, Eu, Lu) disclose an unusual phenomena of a reversible first-order isostructural phase transition around 50 GPa concurring with an abrupt ∼ 5% volume decrease. It is shown experimentally that this transformation concurs with, and is driven by, a high-to-low-spin transition taking place in Fe³⁺; a manifestation of a new kind of isostructural phase transition. These studies suggest that the RFeO₃ perovskite is a rather sturdy oxide-structure, maintaining its original structural symmetry beyond 125 GPa.

• Författare: G. Kh Rozenberg; M. P. Pasternak; W. M. Xu; L. S. Dubrovinsky; S. Carlson; R. D. Taylor
• Publiceringsår: 2005-07-15
• Språk: Engelska
• Sidor: 228-234
• Publikation/Tidskrift/Serie: Europhysics Letters
• Volym: 71
• Issue: 2
• Länkar: http://dx.doi.org/10.1209/epl/i2005-10071-9
• Dokumenttyp: Artikel i tidskrift
• Förlag: EDP Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0295-5075