高压下单晶橄榄石的电导率

田浩然; 徐良旭; 李娜娜; 张茜; 林俊孚; 刘锦

doi:10.11858/gywlxb.20190775

高压下单晶橄榄石的电导率

doi: 10.11858/gywlxb.20190775

田浩然^1,,
徐良旭¹,
李娜娜¹,
张茜¹,
林俊孚²,
刘锦^1,*, ,

1.
北京高压科学研究中心，北京　100193
2.
德克萨斯大学奥斯汀分校，美国德克萨斯 78701

基金项目: 国家自然科学基金（U1530402）

详细信息

作者简介:
田浩然（1993－），男，硕士研究生，主要从事矿物物理学研究. E-mail：haoran.tian@hpstar.ac.cn

通讯作者:
刘　锦（1984－），男，博士，研究员，主要从事地球深部结构与物质组成研究. E-mail：jin.liu@hpstar.ac.cn

中图分类号: O732; P574.1
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出版历程
- 收稿日期: 2019-05-13
- 修回日期: 2019-06-18
- 发布日期: 2019-09-25
- 刊出日期: 2019-12-01

High-Pressure Electrical Conductivity of Single-Crystal Olivine

TIAN Haoran^1
,,
XU Liangxu¹,
LI Nana¹,
ZHANG Qian¹,
LIN Junfu²,
LIU Jin^{1,*
, ,}

1.
Center for High Pressure Science & Technology Advanced Research, Beijing 100193, China
2.
The University of Texas at Austin, Texas 78701, USA

摘要

摘要: 以圣卡洛斯（San Carlos）单晶橄榄石为研究对象，结合交流阻抗谱和金刚石对顶砧（DAC）技术，在300 K、0～19 GPa条件下对其电导率的各向异性进行系统研究。压力标定根据红宝石荧光谱线的漂移以及硅油的拉曼光谱。实验结果表明：在300 K、0～19 GPa条件下，橄榄石[100]方向上的电导率最大，从3.8×10^–8 S/m增加到9.0×10^–8 S/m，[010]与[001]方向上的电导率接近，约为[100]方向电导率的1/2～1/3；橄榄石电导率随着压力线性增加，其中[100]方向的电导率随着压力变化的斜率最大。在室温条件下，橄榄石主要的导电机制是小极化子导电，且具有负的活化体积。研究结果表明，在含水量较低的上地幔区域，随着深度增加，压力效应可能导致电导率横向和纵向的不均一性增强。
- 橄榄石 /
- 复阻抗谱 /
- 金刚石压腔 /
- 电导率 /
- 各向异性
Abstract: The electrical conductivity of single-crystal San Carlos olivine was measured up to 19 GPa at room temperature in a diamond-anvil cell, coupled with a complex impedance spectroscopy. The pressure was determined by in-situ ruby luminescence and Raman shift of silicone fluid. We found that the electrical conductivity along [100] is largest, increasing approximately from 3.8×10^–8 S/m at 0 GPa to 9.0×10^–8 S/m at 18 GPa at room temperature. The conductivity along [010] is comparable to that of [001], approximately as 1/2 to 1/3 as that of [100]. Furthermore, the conductivity linearly increases with the pressure, while it changes faster with the pressure along [100] than that of [010] and [001]. At room temperature, the charge transport mechanism of olivine is dominant from the Fe²⁺–Fe³⁺ (small polarons) with a negative activation volume. The present results suggest that the pressure effect could lead to larger lateral and vertical heterogeneity in electrical conduction for a dry upper mantle.
- olivine /
- complex impedance spectroscopy /
- diamond anvil cell /
- electrical conductivity /
- anisotropy

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图 1 （a）DAC中样品、电极俯视图；（b）[100]方向橄榄石样品显微图像；（c）DAC横截面图；（d）四电极法样品显微图像

Figure 1. (a) Top view of the sample and electrodes in a DAC; (b) Microscopic image of the olivine sample along [100] direction;(c) Cross section view of DAC; (d) Microscopic image of the sample and electrodes using the four-probe method

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图 2 PMX-200硅油v_{2 906}拉曼频移与压力关系

Figure 2. The relation between pressure and Raman shift of v_{2 906}

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图 3 橄榄石的代表性阻抗谱及其等效电路

Figure 3. Representative impedance spectra and equivalent circuit

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图 4 300 K下橄榄石单晶的电导率随压力的变化

Figure 4. The conductivity of the single-crystal olivine as a function of pressure at 300 K

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图 5 橄榄石的平均电导率随压力的变化

Figure 5. Electrical conductivity of olivine aggregates as a function of pressure

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图 6 橄榄石小极化子导电机制的活化体积随铁含量的变化

Figure 6. Total iron content versus activation volume for the small polaron conduction mechanism in olivine

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图 7 干的橄榄石不同轴向电导率随深度变化曲线

Figure 7. Conductivity profile of dry olivine in different orientations

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表 1 样品的EPMA分析结果（质量分数）

Table 1. EPMA analysis results of sample (Mass fraction) %

FeO	MgO	CaO	MnO	SiO₂	Cr₂O₃	NiO	Total
8.78	50.10	0.07	0.11	40.49	0.03	0.35	99.94

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表 2 样品电阻拟合数据

Table 2. Sample resistance fitting data

[100] direction		[010] direction		[001] direction
p/GPa	R/GΩ	p/GPa	R/GΩ	p/GPa	R/GΩ
0	80.8	0	91.7	0	88.1
2.2	67.2	1.8	79.0	1.6	84.1
3.7	61.8	5.3	71.6	3.7	76.9
6.2	57.0	6.6	61.7	6.3	69.7
8.1	52.0	8.0	58.1	8.5	62.1
10.1	46.2	10.1	57.0	10.6	54.3
12.5	41.1	12.7	51.6	12.5	53.2
14.8	34.7	14.7	50.1	13.7	52.1
18.0	28.0	15.8	44.0	14.9	50.3
		19.1	36.0	16.8	49.0
				17.8	47.1

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