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- W1967967695 abstract "Abstract Zero-field Mossbauer spectra of powder samples of Fe(2,9-di-CH 3 -phenanthroline) SO 4 over the range 1.7 to 300°K show a large (∼ 3.6 mm/sec) temperature-independent quadrupole splitting corresponding to an orbital singlet ground term. The chemical isomer shift, δ FE=O , is 1.16 mm/sec (source and absorber at 4.2°K) corresponding to six coordinate high-spin iron (II). Below 4.2°K, the compound exhibits magnetic hyperfine splitting suggesting slow relaxation and the possibility of long-range three-dimensional magnetic ordering with a critical temperature T c such that 3.5°K T c H n = 325 kG at 1.69°K. High-field Mossbauer spectra at 300°K indicate that the principal component of the electric field gradient tensor is positive and axial. Similar spectra at 4.2°K show an absence of nuclear Zeeman splitting for applied fields up to 60 kG, and indicate that at 4.2°K the material is rapidly relaxing but with substantial magnetic polarization and a negative internal hyperfine field. The temperature dependence of the magnetic susceptibility confirms antiferromagnetic interactions with a broad maximum χ ′ M at ∼ 11.8°K presumably due to low-dimensionality exchange interactions (possibly one) along M OSO M chains. Least-squares fits of χ ′ M −1 versus T for T 50°K indicate (Curie-Weiss behavior with C = 3.26 emu/mole, θ = -21.95°K, and μ eff = 5.11." @default.
- W1967967695 created "2016-06-24" @default.
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- W1967967695 date "1980-03-01" @default.
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- W1967967695 title "Magnetic superexchange involving the oxygen-sulfur-oxygen pathway of the sulfate ion: A Mössbauer spectroscopy and magnetic susceptibility study of Fe(2,9-di-CH3-phenanthroline) SO4" @default.
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- W1967967695 doi "https://doi.org/10.1016/0022-4596(80)90106-1" @default.
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