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- Title
Mössbauer study of magnetism in Fe<sup>II − III</sup> (oxy-)hydroxycarbonate green rusts; ferrimagnetism of Fe<sup>II − III</sup> hydroxycarbonate.
- Authors
Rusch, B.; Génin, J.-M. R.; Ruby, Ch.; Abdelmoula, M.; Bonville, P.
- Abstract
FeII − III hydroxycarbonate Fe $^{\rm II}_{4}$ Fe $^{\rm III}_{2}$ (OH)12CO3, green rust GR(CO $_{3}^{2-})$ , reveals a ferrimagnetic behaviour. Moments that lie within two-dimensional cation layers are parallel for same species and antiparallel between FeII and FeIII. Respective ordering temperatures are 5.2 and 7 K. A sextet with distribution from 350 to 580 kOe for FeIII and an octet reflecting a mixture of states with field of 130 kOe and quadrupole splitting of −3.0 mm s − 1 for FeII are observed at 1.4 K. Ferric oxyhydroxycarbonate Fe $^{\rm III}_{6}$ O12H8CO3 is ferromagnetic and displays at 4 K a sextet with field between 400 and 500 kOe (maximum at 480 kOe) and transition at 80 K. GR(CO $_{3}^{2-})$ deprotonation gives magnetic domains with compositions at x = 1/3, 2/3 and 1 due to long range order.
- Subjects
MAGNETISM; MOSSBAUER effect; FERRIMAGNETISM; CATIONS; TEMPERATURE
- Publication
Hyperfine Interactions, 2008, Vol 187, Issue 1-3, p7
- ISSN
0304-3843
- Publication type
Article
- DOI
10.1007/s10751-008-9862-y