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Title: Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite

Abstract

We studied the effect of 973 K heating in argon atmosphere on the magnetic and structural properties of a magnetite-bearing ore, which was previously exposed to laboratory shock waves between 5 and 30 GPa. For this purpose magnetic properties were studied using temperature-dependent magnetic susceptibility, magnetic hysteresis and low-temperature saturation isothermal remanent magnetization. Structural properties of magnetite were analyzed using X-ray diffraction, high-resolution scanning electron microscopy and synchrotron-assisted X-ray absorption spectroscopy. The shock-induced changes include magnetic domain size reduction due to brittle and ductile deformation features and an increase in Verwey transition temperature due to lattice distortion. After heating, the crystal lattice is relaxed and apparent crystallite size is increased suggesting a recovery of lattice defects documented by a mosaic recrystallization texture. The structural changes correlate with modifications in magnetic domain state recorded by temperature-dependent magnetic susceptibility, hysteresis properties and low-temperature saturation isothermal remanent magnetization. In conclusion, these alterations in both, magnetic and structural properties of magnetite can be used to assess impact-related magnetic anomalies in impact structures with a high temperature overprint.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [3]
  1. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Applied Geosciences
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  3. Karlsruhe Inst. of Technology (KIT), Eggenstein-Leopoldshafen (Germany). Synchrotron Radiation Facility ANKA
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; German Research Foundation (DFG)
OSTI Identifier:
1461951
Grant/Contract Number:  
AC02-76SF00515; KO1514/8-1
Resource Type:
Accepted Manuscript
Journal Name:
Geochemistry, Geophysics, Geosystems
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1525-2027
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; experimentally shocked magnetite; effect of annealing; magnetic properties; structural properties; large impact structures

Citation Formats

Kontny, A., Reznik, B., Boubnov, A., Gottlicher, J., and Steininger, R. Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite. United States: N. p., 2018. Web. doi:10.1002/2017gc007331.
Kontny, A., Reznik, B., Boubnov, A., Gottlicher, J., & Steininger, R. Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite. United States. doi:10.1002/2017gc007331.
Kontny, A., Reznik, B., Boubnov, A., Gottlicher, J., and Steininger, R. Mon . "Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite". United States. doi:10.1002/2017gc007331. https://www.osti.gov/servlets/purl/1461951.
@article{osti_1461951,
title = {Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite},
author = {Kontny, A. and Reznik, B. and Boubnov, A. and Gottlicher, J. and Steininger, R.},
abstractNote = {We studied the effect of 973 K heating in argon atmosphere on the magnetic and structural properties of a magnetite-bearing ore, which was previously exposed to laboratory shock waves between 5 and 30 GPa. For this purpose magnetic properties were studied using temperature-dependent magnetic susceptibility, magnetic hysteresis and low-temperature saturation isothermal remanent magnetization. Structural properties of magnetite were analyzed using X-ray diffraction, high-resolution scanning electron microscopy and synchrotron-assisted X-ray absorption spectroscopy. The shock-induced changes include magnetic domain size reduction due to brittle and ductile deformation features and an increase in Verwey transition temperature due to lattice distortion. After heating, the crystal lattice is relaxed and apparent crystallite size is increased suggesting a recovery of lattice defects documented by a mosaic recrystallization texture. The structural changes correlate with modifications in magnetic domain state recorded by temperature-dependent magnetic susceptibility, hysteresis properties and low-temperature saturation isothermal remanent magnetization. In conclusion, these alterations in both, magnetic and structural properties of magnetite can be used to assess impact-related magnetic anomalies in impact structures with a high temperature overprint.},
doi = {10.1002/2017gc007331},
journal = {Geochemistry, Geophysics, Geosystems},
number = 3,
volume = 19,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
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Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Effect of shock pressure and subsequent heating on Verwey transition (TV) and Curie point (TC). (a) Curves of an initial, “0 GPa” sample. Note that the heating (black) and cooling (grey) curves are nearly reversible. (b) Representative irreversible curves for a shocked sample. Curves are normalized to susceptibilitymore » values measured at room temperature. “before heating” and “after heating” in the low‐temperature curve means measurement before and after heating to 973 K. Vertical arrows indicate amplitude and temperature shifts of peaks at TV and TC. (s. also Figure 2 for magnetic transition temperatures of all investigated samples).« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.