Electrical conductivity of siderite and the effect of the spin transition of iron

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2024-05-23 DOI:10.1007/s00269-024-01283-8
Izumi Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Máté Garai, Shigeru Yamashita
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Abstract

We have conducted electrical conductivity measurements of FeCO3 siderite under high pressure up to 63 GPa in order to understand the nature and effect of iron spin transition and its influence on the geophysical properties of siderite, which is an end-member of major carbonate minerals. The results from Raman and Mössbauer spectroscopic measurements show that the high- to low-spin transition of iron occurs at around 50 GPa in agreement with previous studies. A sharp decrease of the electrical conductivity was also observed at around 50 GP, which is associated with the spin transition in iron. Although the stability of FeCO3 siderite may be limited under high-temperature conditions along with the mantle geotherm, solid solutions in the MgCO3-FeCO3 system, Mg1-xFexCO3, could be stable up to the pressure-temperature condition of the lowermost mantle. The pressure-temperature range of the spin transition in Mg1-xFexCO3 is narrower than those of the major lower mantle minerals, ferropericlase and bridgmanite, and thus the drop of the electrical conductivity induced by the spin transition could be clearer under lower mantle conditions. Therefore, the existence of Mg1-xFexCO3 may affect the observed heterogeneity of electrical conductivity in the mid-lower mantle.

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菱铁矿的导电性和铁的自旋转变的影响
我们在高达 63 GPa 的高压下对 FeCO3 菱铁矿进行了电导率测量,以了解铁自旋转变的性质和效果及其对菱铁矿地球物理性质的影响,菱铁矿是主要碳酸盐矿物的末端成员。拉曼和莫斯鲍尔光谱测量结果表明,铁的高自旋向低自旋转变发生在 50 GPa 左右,这与之前的研究结果一致。在 50 GPa 左右还观察到电导率急剧下降,这与铁的自旋转变有关。虽然随着地幔地温的升高,FeCO3菱铁矿在高温条件下的稳定性可能会受到限制,但 MgCO3-FeCO3 系统中的固溶体 Mg1-xFexCO3 在最下地幔的压力-温度条件下可能是稳定的。Mg1-xFexCO3 的自旋转变的压力-温度范围比主要的下地幔矿物铁闪石和桥芒石的压力-温度范围窄,因此在下地幔条件下,自旋转变引起的电导率下降可能更明显。因此,Mg1-xFexCO3 的存在可能会影响所观测到的中下地幔电导率的异质性。
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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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