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The Low‐Temperature Besnus Magnetic Transition: Signals Due to Monoclinic and Hexagonal Pyrrhotite [PDF]
Geochemistry, Geophysics, Geosystems, 2018 The low‐temperature magnetic properties of the many pyrrhotite varieties have not been studied extensively. Monoclinic pyrrhotite (Fe7S8) goes through the Besnus transition at ~30–34 K, which is used widely to diagnose its presence in bulk samples. Other
Chorng-Shern Horng, Andrew P Roberts
exaly +4 more sources
International Journal of Mining Science and TechnologyThe electrochemical interaction between galena and monoclinic pyrrhotite was investigated to examine its impact on the physical and chemical properties of the mineral micro-surface.
Huashan Yan
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Bulletin of the Geological Society of Finland, 1986 Recent literature has produced much information on the thermal and compositional stability and on the natural occurrences and mineral associations of monoclinic pyrrhotite.
G. Kullerud
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On the Magnetism Behind the Besnus Transition in Monoclinic Pyrrhotite [PDF]
Journal of Geophysical Research: Solid Earth, 2018 AbstractIn monoclinic 4C pyrrhotite (ideal formula Fe7S8), ordered vacancy distribution forms a superstructure with strong ferrimagnetism that makes this mineral a major remanent magnetization carrier in the Earth's crust. The pronounced decrease in isothermal remanence magnetization at about 32 K, known as Besnus transition, is a characteristic trait ...
Güven Kurtuldu +2 more
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Preparation of Monoclinic Pyrrhotite by Thermal Decomposition of Jarosite Residues and Its Heavy Metal Removal Performance [PDF]
Minerals (Basel, Switzerland), 2021 Jarosite residues produced by zinc hydrometallurgical processing are hazardous solid wastes. In this study, monoclinic pyrrhotite (M-Po) was prepared by the pyrolysis of jarosite residues in H2S atmosphere. The influence of gas speed, reaction temperature, and time was considered.
Cuimin Xu, Yuefei Zhou, Hanlin Wang
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Transactions of Nonferrous Metals Society of China, 2022 The sulfide passivation film produced on the surface seriously prevents further reaction in the process of using monoclinic pyrrhotite (MPr) to treat heavy metal ions in wastewater. Ultrasonic technology was introduced to assist MPr to recover the copper ions. XPS result proves that CuS products exist on the surface of MPr.
Zhang, Xing-fei +9 more
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Magnetic tests for magnetosome chains in Martian meteorite ALH84001. [PDF]
Proc Natl Acad Sci U S A, 2004 Transmission electron microscopy studies have been used to argue that magnetite crystals in carbonate from Martian meteorite ALH84001 have a composition and morphology indistinguishable from that of magnetotactic bacteria.
Weiss BP +6 more
europepmc +3 more sources
Hysteresis properties of sized dispersed monoclinic pyrrhotite grains
Geophysical Research Letters, 1984 Monoclinic pyrrhotite (Fe7S8 with 4C superstructure) was magnetically separated from a massive pyrrhotitic ore for preparation of nine grain‐size fractions ranging from ∼ 80 µm (large multidomain grains) to < 3 µm (single‐domain grains). Grains smaller than 100 µm were found to be magnetically hard with coercive forces ranging from 135 oe for 83 µ ...
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Magnetic characterization of non-ideal single-domain monoclinic pyrrhotite and its demagnetization under hydrostatic pressure up to 2 GPa with implications for impact demagnetization [PDF]
Physics of the Earth and Planetary Interiors, 2016 © 2016 Elsevier B.V..Here we present a comprehensive magnetic characterization of synthesized non-ideal single-domain (SD) monoclinic pyrrhotite (Fe7S8). The samples were in the form of a powder and a powder dispersed in epoxy. "Non-ideal" refers to a powder fraction of predominantly SD size with a minor contribution of small pseudo-single-domain ...
Natalia Bezaeva +2 more
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Effects of Galvanic Interaction between Chalcopyrite and Monoclinic Pyrrhotite on Their Flotation Separation [PDF]
Minerals, 2021 The galvanic interaction between chalcopyrite and monoclinic pyrrhotite and its effect on flotation separation were studied using monomineral flotation tests, adsorption capacity tests, X-ray photoelectron spectroscopy (XPS) characterization, and scanning electron microscopy (SEM) test.
Liu Yang +5 more
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