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.
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Rusch, B., Génin, JM.R., Ruby, C. et al. Mössbauer study of magnetism in FeII − III (oxy-)hydroxycarbonate green rusts; ferrimagnetism of FeII − III hydroxycarbonate. Hyperfine Interact 187, 7–12 (2008). https://doi.org/10.1007/s10751-008-9862-y
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DOI: https://doi.org/10.1007/s10751-008-9862-y