Volume 71, Number 2, July 2005
|Page(s)||228 - 234|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||08 June 2005|
Consequences of pressure-instigated spin crossover in R perovskites; a volume collapse with no symmetry modification
School of Physics and Astronomy, Tel-Aviv University - Tel-Aviv, Israel
2 Bayerisches Geoinstitut, University Bayreuth - Bayreuth, Germany
3 European Synchrotron Radiation Facility - Grenoble, France
4 MST-10, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Accepted: 11 May 2005
High-pressure X-ray diffraction, Mössbauer, and Raman studies in the antiferromagnetic insulators R orthorhombic perovskites (, , ) disclose an unusual phenomena of a reversible first-order isostructural phase transition around 50 concurring with an abrupt volume decrease. It is shown experimentally that this transformation concurs with, and is driven by, a high-to-low-spin transition taking place in ; a manifestation of a new kind of isostructural phase transition. These studies suggest that the R perovskite is a rather sturdy oxide-structure, maintaining its original structural symmetry beyond 125.
PACS: 61.10.-i – X-ray diffraction and scattering / 62.50.+p – High-pressure and shock wave effects in solids and liquids / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EDP Sciences, 2005
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