Abstract
In the binary Fe−Te system six intermediate solid phases exist with varying ranges of homogeneity. With the exception of the high temperature β′-phase the magnetic behavior of these phases and in some cases the variation of magnetic properties with composition were investigated by susceptibility measurements in the temperature range from 100 to 300 K. Both the β-phase (FeTe1−x ) and the γ-phase (Fe5Te6) follow theCurie—Weiss law and can be designated as antiferromagnetic compounds according to the negativeWeiss constants of −192 K and −314 K, resp. The magnetic moments identify these two phases as high-spin compounds of Fe. The observed increase of the magnetic moments towards the Ferich limit of the β-phase is due to the occupation of the octahedral interstices in the anion sublattice by excess iron and it was explained by a simple model. The magnetic moment of the hypothetical equiatomic compounds “FeTe”, obtained by extrapolation (3.87 μB), as well as the moment of the γ-phase (3.83 μB) are nearly identical and can be interpreted as being due to the existence of three unpaired 3d-electrons per formula unit. For the Te-rich δ (Fe1−x Te)-, δ′ (Fe1−x Te)- and ɛ (FeTe2)-phases the transition metal is supposed to be in the low-spin state. The observedPauli paramagnetism is not temperature independent but decreases with decreasing temperature. Below 100 K FeTe2 appears to be diamagnetic.
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Komarek, K.L., Terzieff, P. Magnetische Messungen im System Fe—Te. Monatshefte für Chemie 106, 145–157 (1975). https://doi.org/10.1007/BF00914508
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DOI: https://doi.org/10.1007/BF00914508