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Morin-type transition in 5C pyrrhotite

  • Charles R.S. Haines ORCID logo , Giulio I. Lampronti , Wim T. Klooster , Simon J. Coles , Sian E. Dutton und Michael A. Carpenter
Veröffentlicht/Copyright: 20. September 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 9

Abstract

We report the discovery of a low-temperature spin-flop transition in 5C pyrrhotite at ~155 K that is similar to those seen in hematite at 260 K and FeS (troilite) at 440 K. The 5C crystal was produced by annealing a 4C pyrrhotite crystal at 875 K to produce a change in the vacancy-ordering scheme that developed during cooling. The 5C structure is confirmed by single-crystal X‑ray diffraction and the stoichiometry and homogeneity by electron microprobe and SEM BSE mapping. Resonant ultrasound spectroscopy (RUS), heat capacity, and magnetization measurements from room temperature down to 2 K are reported. The transition is marked by a steep change in elastic properties at the transition temperature, a peak in the heat capacity, and weak anomalies in measurements of magnetization. Magnetic hysteresis loops and comparison with the magnetic properties of 4C pyrrhotite suggest that the transition involves a change in orientation of moments between two different antiferromagnetic structures, perpendicular to the crystallographic c-axis at high temperatures and parallel to the crystallographic c-axis at low temperatures. The proposed structures are consistent with a group theoretical treatment that also predicts a first-order transition between the magnetic structures.

Keywords: Pyrrhotite; palaeomagnetism; mineralogy; crystal structure

  1. Funding

    The authors acknowledge funding from the Leverhulme Foundation, grant number RPG2016-298. Heat capacity and DC magnetic measurements were carried out using the Advanced Materials Characterization Suite, funded by EPSRC Strategic Equipment Grant EP/M000524/1. RUS facilities in Cambridge were funded by grants to MAC from the Natural Environment Research Council of Great Britain (grant nos. NE/B505738/1 and NE/F17081/1) and from the Engineering and Physical Sciences Research Council (grant no. EP/I036079/1).

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Received: 2019-08-20
Accepted: 2020-02-26
Published Online: 2020-09-20
Published in Print: 2020-09-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2020-7266
Schlagwörter für diesen Artikel
Pyrrhotite; palaeomagnetism; mineralogy; crystal structure

Artikel in diesem Heft

  1. MSA Centennial Review Paper
  2. How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy’s future role
  3. Petrographic and spectral study of hydrothermal mineralization in drill core from Hawaii: A potential analog to alteration in the martian subsurface
  4. Characterizing low-temperature aqueous alteration of Mars-analog basalts from Mauna Kea at multiple scales
  5. Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz
  6. Metasomatism-controlled hydrogen distribution in the Spitsbergen upper mantle
  7. Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica
  8. Density and sound velocity of liquid Fe-S alloys at Earth’s outer core P-T conditions
  9. Some geometrical properties of fission-track-surface intersections in apatite
  10. Thermal equation of state of post-aragonite CaCO3-Pmmn
  11. Structure of NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 glasses and glass-ceramics
  12. Raman spectroscopic studies of O–H stretching vibration in Mn-rich apatites: A structural approach
  13. Characterization of modified mineral waste material adsorbent as affected by thermal treatment for optimizing its adsorption of lead and methyl orange
  14. Morin-type transition in 5C pyrrhotite
  15. The formation of marine red beds and iron cycling on the Mesoproterozoic North China Platform
  16. A multi-methodological study of kernite, a mineral commodity of boron
  17. Letter
  18. Si-rich Mg-sursassite Mg4Al5Si7O23(OH)5 with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase
  19. Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
  20. Memorial of F. Donald Bloss 1920–2020
  21. Book Review
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