@article{679ea132d50e45f98f979948344878b9,
title = "Pressure-induced coordination crossover in magnetite, a high pressure M{\"o}ssbauer study",
abstract = "Temperature-dependent 57Fe M{\"o}ssbauer spectroscopy to 40 GPa shows that Fe3O4 magnetite undergoes a coordination crossover (CC) whereby charge-density is shifted from octahedral to tetrahedral sites and the spinel structure thus changes from inverse to normal with increasing pressure and decreasing temperature. A precursor to the CC is a d-charge decoupling within the octahedral sites at the inverse spinel phase. The CC-transition takes place almost exactly at the Verwey transition temperature (TV=122K) at ambient pressure. While TV decreases with pressure, the CC-transition temperature increases with pressure, reaching 350 K at 10 GPa. The d electron localization mechanism proposed by Verwey and later by Mott for TV is shown to be unrelated to the actual mechanism of the metal-insulator transition attributed to the Verwey transition. It is proposed that a first-order phase transition taking place at ∼TV at ambient pressure opens a small gap within the oxygen p-band, resulting in the observed insulating state at T>TV.",
keywords = "C. High pressure, C. M{\"o}ssbauer spectroscopy, C. X-ray diffraction",
author = "Pasternak, {M. P.} and Xu, {W. M.} and Rozenberg, {G. Kh} and Taylor, {R. D.} and R. Jeanloz",
note = "Funding Information: This research was supported in part by BSF Grant 9800003 and by Israeli Science Foundation Grant 1998003.",
year = "2004",
month = aug,
doi = "10.1016/j.jpcs.2003.12.013",
language = "אנגלית",
volume = "65",
pages = "1531--1535",
journal = "Journal of Physics and Chemistry of Solids",
issn = "0022-3697",
publisher = "Elsevier Ltd.",
number = "8-9",
}