Magnetic and electrical properties of ilvaite
- 15 March 1984
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 55 (6) , 1963-1965
- https://doi.org/10.1063/1.333533
Abstract
Electrical conductivity, magnetization, magnetic susceptibility, and Mössbauer spectra are reported for three samples of ilvaite, a mixed-valence iron silicate with ideal composition CaFe2+2Fe3+Si2O8(OH). The Néel temperature is 118±3 K, but there is evidence from the susceptibility for competing antiferromagnetic and ferromagnetic exchange interactions. Analysis of the Mössbauer spectra at 4.2 K for Fe2+ at A and B sites, shows that e2qQ is positive and η∼0, indicating pseudotetragonal local symmetry and orbital singlet ground states for both ions. A peak found at 40 K in the susceptibility measured with the field perpendicular to the c axis may be related to the temperature dependence of the Fe2+ single-ion anisotropy.This publication has 7 references indexed in Scilit:
- Magnetic order in crocidolite asbestosPhysics and Chemistry of Minerals, 1983
- Electron hopping in cronstedtiteSolid State Communications, 1982
- The electronic structure of ilvaite and the pressure and temperature dependence of its 57Fe Mössbauer spectrumJournal of Physics and Chemistry of Solids, 1980
- Mössbauer spectra and magnetic features of ilvaitesPhysics and Chemistry of Minerals, 1979
- Ilvaite: A study of temperature dependent electron delocalization by the mössbauer effectPhysics and Chemistry of Minerals, 1979
- Neutron diffraction study of ilvaiteZeitschrift für Kristallographie, 1976
- Untersuchungen zur Kristallchemie des IlvaitsTschermaks Mineralogische und Petrographische Mitteilungen, 1974