Results 151 to 160 of about 1,324 (171)
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Enthalpy of formation of monoclinic pyrrhotite and its stability in the system Fe-S
International Geology Review, 1977Pyrrhotitc reacts easily to change of temperature and geochemical regime of sulfur. This limits its use as an indicator of physico-chemical conditions of formation.
N.I. Bezmen, T.A. Smolyarova
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Physics of the Earth and Planetary Interiors, 1995
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 M s (T) ≈ (1 − T T c ) 0.52
A. Menyeh, W. O'Reilly
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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 M s (T) ≈ (1 − T T c ) 0.52
A. Menyeh, W. O'Reilly
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Geophysical Journal International, 2016
Monoclinic pyrrhotite (Fe7S8) owes its ferrimagnetism to an ordered array of Fe vacancies. Its magnetic properties change markedly around 30 K, in what is known as the Besnus transition. Plausible explanations for the Besnus transition are either due to changes in crystalline anisotropy from a transformation in crystal symmetry or from the ...
Michael W.R. Volk +2 more
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Monoclinic pyrrhotite (Fe7S8) owes its ferrimagnetism to an ordered array of Fe vacancies. Its magnetic properties change markedly around 30 K, in what is known as the Besnus transition. Plausible explanations for the Besnus transition are either due to changes in crystalline anisotropy from a transformation in crystal symmetry or from the ...
Michael W.R. Volk +2 more
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Geophysical Journal International, 2015
Non-stoichiometric monoclinic 4C pyrrhotite (Fe7S8) is a major magnetic remanence carrier in the Earth's crust and in extraterrestrial materials. Because of its low-temperature magnetic transition around 30 K also known as Besnus transition, which is considered to be an intrinsic property, this mineral phase is easily detectable in natural samples ...
Koulialias, D. +5 more
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Non-stoichiometric monoclinic 4C pyrrhotite (Fe7S8) is a major magnetic remanence carrier in the Earth's crust and in extraterrestrial materials. Because of its low-temperature magnetic transition around 30 K also known as Besnus transition, which is considered to be an intrinsic property, this mineral phase is easily detectable in natural samples ...
Koulialias, D. +5 more
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Journal of the Ghana Science Association, 1998
The thermal variation of the number of domains (nd) for Fe7S8 particles (within the size range 1-30 mm and between 20 and 300°C), has been inferred from the room temperature analytic expression between nd and particle size (L), the temperature dependences of the anisotropy energy constant (K) and the spontaneous magnetization (Ms) and, an assumed ...
Menyeh, A., O'Reilly, W.
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The thermal variation of the number of domains (nd) for Fe7S8 particles (within the size range 1-30 mm and between 20 and 300°C), has been inferred from the room temperature analytic expression between nd and particle size (L), the temperature dependences of the anisotropy energy constant (K) and the spontaneous magnetization (Ms) and, an assumed ...
Menyeh, A., O'Reilly, W.
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The coercive force of fine particles of monoclinic pyrrhotite (Fe7S8), between 77 K and 600 K
Journal of the Ghana Science Association, 1999The temperature dependence of coercive force (Hc) between 77 K and 600 K has been investigated for fine particles of monoclinic pyrrhotite (Fe7S8) of < 1 mm and 1- 30 mm particle sizes. The study has shown that Hc is strongly dependent on temperature, as temperature rises above room temperature (293 K) to near the Curie point (Tc = 593 K). On the other
Menyeh, A., O’Reilly, W.
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Thermoremanent magnetization in monodomain monoclinic pyrrhotite Fe7S8
Journal of Geophysical Research: Solid Earth, 1996The intensity and stability of thermoremanent magnetization (TRM) acquired by fine particles (<1µm) of synthetic monoclinic pyrrhotite were determined. A specific TRM (magnetization per unit inducing field) of 32 with a median destructive field of 36 kA m−1 was observed.
A. Menyeh, W. O'Reilly
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2018
Physicochemical Problems of Mineral Processing; ISSN 2084 ...
Chen, Xiong +3 more
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Physicochemical Problems of Mineral Processing; ISSN 2084 ...
Chen, Xiong +3 more
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Surface Science, 1997
The properties of monoclinic Fe7S8(001) surfaces have been examined using LEED and STM following sputtering and annealing of the surface at ∼ 300 °C. A phase transition is observed in LEED patterns taken at elevated temperatures. At temperatures above ∼300 °C, the LEED patterns show only the periodicity of the roughly hexagonal closest-packed S atoms ...
Becker, Udo +4 more
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The properties of monoclinic Fe7S8(001) surfaces have been examined using LEED and STM following sputtering and annealing of the surface at ∼ 300 °C. A phase transition is observed in LEED patterns taken at elevated temperatures. At temperatures above ∼300 °C, the LEED patterns show only the periodicity of the roughly hexagonal closest-packed S atoms ...
Becker, Udo +4 more
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