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Shock-induced deformation phenomena in magnetite and their consequences on magnetic properties

Reznik, Boris; Kontny, Agnes; Fritz, Jörg; Gerhards, Uta

This study investigates the effects of shock waves on magnetic and microstructural behavior of multidomain magnetite from a magnetite‐bearing ore, experimentally shocked to pressures of 5, 10, 20, and 30 GPa. Changes in apparent crystallite size and lattice parameter were determined by X‐ray diffraction, and grain fragmentation and defect accumulation were studied by scanning and transmission electron microscopy. Magnetic properties were characterized by low‐temperature saturation isothermal remanent magnetization (SIRM), susceptibility measurements around the Verwey transition as well as by hysteresis parameters at room temperature. It is established that the shock‐induced refinement of magnetic domains from MD to SD‐PSD range is a result of cooperative processes including brittle fragmentation of magnetite grains, plastic deformation with shear bands and twins as well as structural disordering in form of molten grains and amorphous nanoclusters. Up to 10 GPa, a decrease of coherent crystallite size, lattice parameter, saturation magnetization (Ms), and magnetic susceptibility and an increase in coercivity, SIRM, and width of Verwey transition are mostly associated with brittle grain fragmentation. ... mehr

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DOI: 10.1002/2016GC006338
Zitationen: 13
Web of Science
Zitationen: 12
Zitationen: 16
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Mikroverfahrenstechnik (IMVT)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1525-2027
KITopen-ID: 1000059963
HGF-Programm 37.03.02 (POF III, LK 01) Components and Process Development
Erschienen in Geochemistry, geophysics, geosystems
Verlag John Wiley and Sons
Band 17
Heft 6
Seiten 2374-2393
Nachgewiesen in Web of Science
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