Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite

Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite
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冲击后热诱导转变为实验冲击磁铁矿

DOI:
10.1002/2017gc007331
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Steininger
Steininger
中科院分区:
地球科学3区
文献类型:
--
作者:
Kontny;Reznik;Boubnov;Göttlicher;Steininger

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我们研究了在氩气气氛中973 K加热对含磁铁矿矿石的磁性和结构性质的影响,该矿石先前暴露于5至30 GPa的实验室冲击波。为此,使用温度依赖的磁化率、磁滞和低温饱和等温剩磁研究了磁性。利用X射线衍射、高分辨率扫描电子显微镜和同步加速器辅助X射线吸收光谱分析了磁铁矿的结构特性。冲击引起的变化包括由于脆性和韧性变形特征导致的磁畴尺寸减小以及由于晶格畸变导致的Verwey转变温度升高。加热后,晶格松弛,表观微晶尺寸增加,表明由马赛克再结晶织构记录的晶格缺陷的恢复。结构变化与磁畴状态的修改相关,这些磁畴状态由温度相关的磁化率、磁滞特性和低温饱和等温剩磁记录。磁铁矿的磁性和结构性质的这些变化可用于评估具有高温叠印的撞击结构中与撞击相关的磁性异常。
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. 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.
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