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Low-temperature magnetism of alabandite: Crucial role of surface oxidation
-
Jan Čuda
,
Tomáš Kohout
Veröffentlicht/Copyright:
7. März 2015
Abstract
Manganese(II) monosulphide crystallizes into three different polymorphs (α-, β-, and γ-MnS). Out of these, α-MnS, also known as mineral alabandite, is considered the most stable and is widespread in terrestrial materials as well as in extraterrestrial objects such as meteorites.
In this study, a low-temperature antiferromagnetic state of α-MnS was investigated using macroscopic magnetic measurements as induced and remanent field-cooled (FC) and zero-field-cooled (ZFC) magnetizations and magnetic hysteresis. Both natural alabandite and synthetic samples show: (1) Néel temperatures in a narrow temperature range around 153 K, and (2) a rapid increase of the magnetization around 40 K. An anomalous magnetic behavior taking place at about 40 K was previously ascribed to the magnetic transition from a high-temperature antiferromagnetic to a low-temperature ferromagnetic state documented for non-stoichiometric α-MnS slightly enriched in manganese. However, our detailed microscopic observations and, in particular, oxidation experiments indicate that the anomalous magnetic behavior around 40 K is caused by the presence of an oxide layer of ferrimagnetic hausmannite (Mn3O4) on the surface of α-MnS rather than being an intrinsic property of nearly stoichiometric α-MnS.
Received: 2012-9-12
Accepted: 2013-3-28
Published Online: 2015-3-7
Published in Print: 2013-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Editorial. Why you should publish your best papers in American Mineralogist: An International Journal of Earth and Planetary Materials
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- Versatile monazite: Resolving geological records and solving challenges in materials science. Carboniferous inherited grain and age zoning of monazite and xenotime from leucogranites in far-eastern Nepal: Constraints from electron probe microanalysis
- Versatile monazite: Resolving geological records and solving challenges in materials science. Diffusion of helium in natural monazite, and preliminary results on He diffusion in synthetic light rare earth phosphates
- Crystal structure of the high-pressure phase of calcium hydroxide, portlandite: In situ powder and single-crystal X-ray diffraction study
- Experimental development of patch perthite from synthetic cryptoperthite: Microstructural evolution and chemical re-equilibration
- Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup
- Behavior of gold in a magma at sulfide-sulfate transition: Revisited
- A disordered nanoparticle model for 6-line ferrihydrite
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- Iron sulfide stoichiometry as a monitor of sulfur fugacity in gas-mixing experiments
- Relaxation effects and re-entrant spin glass behavior at low temperatures in natural strunzite, ferristrunzite, and ferrostrunzite
- Enthalpies of formation of Fe-Ni monosulfide solid solutions
- Influence of temperature and Cl on the hydrothermal replacement of calcite by apatite and the development of porous microstructures
- Ordering state in orthopyroxene as determined by precession electron diffraction
- Interlayer water molecules in organocation-exchanged vermiculite and montmorillonite: A case study of tetramethylammonium
- Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals
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- Crystallographic and spectroscopic characterization of Fe-bearing chromo-aluminopovondraite and its relations with oxy-chromium-dravite and oxy-dravite
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