Startseite Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
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Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey

  • Peter Robinson EMAIL logo , S.A. McEnroe , Nobuyoshi Miyajima , Karl Fabian und Nathan Church
Veröffentlicht/Copyright: 4. März 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 3

Abstract

Some intergrowths between rhombohedral and cubic Fe-Ti oxides show properties of high remanence and stability, greater than can be explained solely by properties of the individual phases. Magnetic experiments demonstrate magnetic coupling across the interfaces between these phases. These have similarities to intergrowths solely of rhombohedral oxides with the properties of lamellar magnetism. Long-known studies indicate the common interface is along (111) octahedral planes of the cubic phase and (001) of the rhombohedral phase. This is confirmed in new TEM results on a synthetic titano-hematite and on a natural ferri-ilmenite, both with reduction-exsolution lamellae of magnetite, where high-resolution lattice-fringe images demonstrate a common orientation of Fe octahedra along the interface. Such information provides a starting point to investigate atomic configurations, ionic charge imbalance, and magnetic moments along these interfaces, and leads toward a new application of the theory of lamellar magnetism.

Keywords: Magnetic coupling; rhombohedral; cubic; oxides; remanent magnetization; interface; Invited Centennial article

Acknowledgments

Our long-term collaborator Phil Schmidt called our attention to the Peculiar Knob, Black Hill Norite, and Harcus natural samples that are related to unusual magnetic anomalies. The synthetic ilmenite 40 sample was synthesized by Ben Burton (1982), at the time not realizing that a very small “mistake” in experimental oxygen fugacity created the minute magnetite lamellae, only discovered decades later by magnetic experiments, and TEM, and providing a vital key to lattice orientation across the phase interface. The image in Figure 1 was provided by Gurli Meyer. Tiziana Boffa Ballaran, Bayerisches Geoinstitut, provided key lattice parameters by high-resolution X-ray diffraction of the synthetic sample. This research was supported by NFR Grant 222666 to McEnroe. The Institute for Rock Magnetism, University of Minnesota, provided instrument access. To each of these persons and institutions, we express our grateful acknowledgment.

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  1. Manuscript handled by Joshua Feinberg.

Received: 2015-7-31
Accepted: 2015-10-2
Published Online: 2016-3-4
Published in Print: 2016-3-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5519
Schlagwörter für diesen Artikel
Magnetic coupling; rhombohedral; cubic; oxides; remanent magnetization; interface; Invited Centennial article

Artikel in diesem Heft

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
  5. Research Article
  6. Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
  7. Research Article
  8. Are covalent bonds really directed?
  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
  12. Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars
  13. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  14. Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China
  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  16. Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO4
  17. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  18. Magnetite spherules in pyroclastic iron ore at El Laco, Chile
  19. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  20. Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes
  21. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  22. Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
  23. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  24. Dynamics and thermodynamics of magma mixing: Insights from a simple exploratory model
  25. Special Collection: From Magmas to Ore Deposits
  26. Geochemistry, petrologic evolution, and ore deposits of the Miocene Bodie Hills Volcanic Field, California and Nevada
  27. Research Article
  28. Recognizing sulfate and phosphate complexes chemisorbed onto nanophase weathering products on Mars using in-situ and remote observations
  29. Research Article
  30. Crystallographic orientation relationships in host–inclusion systems: New insights from large EBSD data sets
  31. Research Article
  32. In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
  33. Research Article
  34. Confined water in tunnel nanopores of sepiolite: Insights from molecular simulations
  35. Research Article
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