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• W2041177314 abstract "Monoclinic pyrrhotite was synthesized using the silica tube technique and characterized by X-ray diffraction and magnetic measurement. The temperature dependence of the spontaneous magnetization Ms, between room temperature and the Curie point temperature Tc could be fitted by the function Ms(T) ≈ (1 − TTc)0.52. The synthesized material was separated into five particle size fractions within the size range 2–26 μm, and hysteresis loops were determined for each fraction between room temperature and the Curie point at 320°C. Up to 250°C the coercive force, Hc, can be plausibly expressed as simple separate analytic functions of size L and temperature T, each containing a single parameter, namely, (1 − TTc)q; (Ms(T)Ms(293))p; L−n; exp(−kL12). It is argued that the temperature dependence of Hc in this range reflects the temperature dependence of Ms and K (a magnetocrystalline anisotropy constant), as they influence domain wall movements. We suppose that the K relevant to the magnetization process in pyrrhotite powders is that appropriate to triaxial symmetry in the basal plane of the crystal structure. The adoption of a model based on the presence of many inclusions within a domain wall allows the temperature dependence of K to be inferred; this inferred dependence is consistent with a dipolar contribution to anisotropy predominant over single-ion effects in this temperature range. Above 250°C, as the Curie point is approached, the departure from the Hc(T,L) behaviour of lower temperatures suggests that thermal agitation and/or change in the system of microstates accessible to the particles become significant." @default.
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• W2041177314 date "1995-05-01" @default.
• W2041177314 modified "2023-09-24" @default.
• W2041177314 title "The coercive force of fine particles of monoclinic pyrrhotite (Fe7S8) studied at elevated temperature" @default.
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• W2041177314 doi "https://doi.org/10.1016/0031-9201(94)02999-r" @default.
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