高压下石榴子石结构和弹性的第一性原理研究

杨龙星; 刘雷; 刘红; 易丽; 顾小雨

doi:10.11858/gywlxb.20190785

高压下石榴子石结构和弹性的第一性原理研究

doi: 10.11858/gywlxb.20190785

中国地震局地震预测研究所，高压物理与地震科技联合实验室，地震预测重点实验室，北京　100036

基金项目: 中国地震局地震预测研究所基本科研业务费项目（2016IES010104）

详细信息

作者简介:
杨龙星（1994－），男，硕士研究生，主要从事高温高压矿物物性研究. E-mail：yanglongxing17@mails.ucas.ac.cn

通讯作者:
刘　雷（1980－），男，博士，副研究员，主要从事高温高压矿物物性研究. E-mail：liulei@ief.ac.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2019-05-28
- 修回日期: 2019-06-12
- 发布日期: 2019-09-25

Structure and Elasticity of Garnet under High Pressure by First-Principles Simulation

Key Laboratory of Earthquake Forecasting, United Laboratory of High-Pressure Physics andEarthquake Science, Institute of Earthquake Forecasting, CEA, Beijing 100036, China

摘要

摘要: 石榴子石是上地幔和地幔转换带的重要成分，掌握其高温高压下的物性演化特征对了解地幔物质组成、结构以及动力学过程具有重要意义。为此，利用第一性原理计算了0～16 GPa压力下铝系列和钙系列常见的6种榴石（镁铝榴石、铁铝榴石、锰铝榴石、钙铬榴石、钙铝榴石和钙铁榴石）的晶体结构和弹性性质。结果表明：铝系列榴石的晶胞体积小于钙系列榴石；除镁铝榴石外，铝系列榴石的密度高于钙系列榴石。在石榴子石压缩过程中，多面体体积变化率由大到小依次为[XO₈]十二面体、[YO₆]八面体、[SiO₄]四面体，且变化率之比接近3∶2∶1，表明石榴子石的压缩机制主要受其结构中的十二面体控制。键角方差的变化表明：高压可以使钙系列榴石的四面体和八面体变得更加规则；而铝系列榴石则与其不同，高压下铝系列榴石的四面体变得更加不规则。研究发现：石榴子石的体弹模量随着铁铝榴石含量的增加而增大，随着钙铬榴石和钙铝榴石含量的增加而减小；而剪切模量则随着钙铝榴石含量的增加而增大，随着铁铝榴石和钙铬榴石含量的增加而减小。除镁铝榴石外，铝系列榴石的波速整体小于钙系列榴石。通过计算结果发现，石榴子石及其固溶体的波速在410 km附近与地球典型波速模型有交点，证明了石榴子石是地幔中的重要组分，且不同组成的石榴子石及固溶体的存在可能对地球地幔的波速结构产生重要影响。
- 石榴子石 /
- 晶体结构 /
- 弹性 /
- 高压 /
- 第一性原理
Abstract: Garnet is an important component of the upper mantle and mantle transition zone, and its properties under high temperature and pressure are of great significance to understand the composition, structure and dynamic process of mantle. Therefore, the crystal structure and elastic properties of pyrope, almandine, spessartite, uvarovite, grossular and andradite under 0–16 GPa, the six most common garnet in the Earth, were calculated by first principle method. The results show the unit cell volume of pyralaspite (pyrope, almandine, spessartite) is smaller than that of ugrandite (uvarovite, grossular and andradite), and the density of pyralaspite is higher than that of ugrandite except for pyrope. During structural compression, the volume change of polyhedron is from large to small as [XO₈] dodecahedron, [YO₆] octahedron and [SiO₄] tetrahedron, and their ratio is close to 3∶2∶1, indicating that the compression mechanism of garnet is mainly controlled by the dodecahedron. The variation of bond angle shows that tetrahedron and octahedron of the ugrandite would be more regular under high pressure; while the tetrahedron of pyralaspite becomes more irregular under high pressure. The bulk modulus of garnet increases with the increase of almandine, and decreases with the increase of uvarovite and grossular; while the shear modulus of garnet increases with the increase of grossular, and decreases with the increase of almandine and uvarovite. The wave velocity of pyralaspite is smaller than that of ugrandite except for pyrope. Calculation results show that the wave velocities of garnet intersect with the typical wave velocity model of the Earth near 410 km, proving that garnet is an important component of the mantle, and the existence of garnet and its solid solution with different compositions may have an important influence on the wave velocity structure of the Earth’s mantle.
- garnet /
- crystal structure /
- elasticity /
- high pressure /
- first principle simulation

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图 1 石榴子石的晶胞边长随压力的变化

Figure 1. Variation of the lattice parameter of garnet with pressure

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图 2 石榴子石晶体密度随深度的变化

Figure 2. Variation of density of garnets with depth

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图 3 石榴子石中四面体、八面体和十二面体体积随压力的变化

Figure 3. Volume changes of tetrahedron, octahedron and dodecahedron of garnets with pressure

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图 4 四面体、八面体和十二面体的体积变化率所占比例关系

Figure 4. Proportion of volumetric change rates for tetrahedron, octahedron, and dodecahedron

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图 5 石榴子石的O–Y–O键、O–Si–O键的键角方差

Figure 5. Bond angle variances of the O–Y–O bond and the O–Si–O bond of two series of garnets

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图 6 6种石榴子石的弹性模量随压力的变化

Figure 6. Elastic modulus of six garnets varies with pressure

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图 7 6种石榴子石的地震波速随深度的变化

Figure 7. Variations of seismic velocity of six garnets with depth

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表 1 常压下石榴子石晶胞参数和弹性模量

Table 1. Lattice parameters and elastic modulus of garnet under normal pressure

Garnet	Lattice parameter/Å	Density/（g·cm^–3）	Method	Bulk modulus/GPa	Shear modulus/GPa
Pyrope	11.559		Exp.^[35]	199.0
	11.466	3.582	Exp.^[7]	172.7	92.0
			Exp.^[36]	173.6	94.9
		3.610	Exp.^[6]	170.1	90.2
	11.447	3.569	Exp.^[37]	167.0
	11.472		Exp.^[38]	173.7
	11.486	3.587	Average	176.0	92.4
	11.581	3.448	This study	154.5	83.1
Almandine	11.532	4.312	Exp.^[14]	168.0
		4.289	Exp.^[6]	175.1	92.1
	11.519		Exp.^[13]	185.0
	11.507	3.916	Exp.^[8]	173.7	95.4
	11.535	3.930	Exp.^[8]	174.9	95.5
	11.523	4.110	Average	175.3	94.3
	11.591	4.250	This study	166.6	79.4
Uvarovite	11.99	3.850	Exp.^[39]	162.0	92.0
		3.841	Exp.^[6]	164.8	89.9
	11.990	3.846	Average	163.4	91.0
	12.070	3.780	This study	139.1	79.8
Spessartine	11.617	4.195	Exp.^[40]	178.8	96.3
	11.611	4.172	Exp.^[8]	176.4	96.5
	11.608	4.185	Exp.^[8]	171.8	93.3
	11.612	4.184	Average	175.7	95.4
	11.744	4.060	This study	165.6	89.8
Grossular	11.849	3.600	Exp.^[7]	166.8	108.9
	11.848	3.602	Exp.^[40]	168.4	109.0
	11.870	3.659	Exp.^[8]	161.2	102.6
	11.910	3.667	Exp.^[8]	162.4	102.9
	11.869	3.632	Average	164.7	105.9
	11.991	3.471	This study	143.4	87.4
Andradite	12.048	3.840	Exp.^[7]	159.4	90.0
	12.054	3.836	Exp.^[39]	157.0	90.0
	12.009	3.775	Exp.^[8]	147.3	92.7
		3.938	Exp.^[6]	162.5	86.0
	12.037	3.847	Average	156.6	89.7
	11.977	3.930	This study	151.9	89.3

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表 2 石榴子石的弹性常数（C₁₁、C₁₂、C₄₄）和波速

Table 2. Elastic constants (C₁₁, C₁₂, C₄₄) and wave velocity of garnet

Garnet	C₁₁/GPa	C₁₂/GPa	C₄₄/GPa	v_P/（m·s^–1）	v_S/（m·s^–1）	Ref.
Pyrope	297.6	109.8	92.7	9.08	5.07	[7]
	301.0	110.0	94.3			[36]
				8.94	5.02	[6]
			90.7	8.92	4.99	[8]
			91.7	8.92	5.00	[8]
	263.1	100.1	84.2	8.78	4.91	This study
Almandine	309.0	111.0	96.0			[41]
				8.33	4.64	[6]
			95.0	8.77	4.94	[8]
			94.9	8.77	4.93	[8]
	270.9	114.4	80.1	8.01	4.32	This study
Uvarovite	304	91	84	8.85	4.64	[39]
				8.60	4.83	[6]
	259.7	78.7	73.4	8.34	4.75	This study
Spessartine	309.5	113.5	95.2			[41]
			96.2	8.55	4.81	[8]
			92.0	8.41	4.72	[8]
	283.1	114.4	90.9	8.38	4.70	This study
Grossular	321.7	104.6	91.4	9.49	5.54	[7]
	321.7	104.6	91.4			[40]
			98.8	9.02	5.30	[8]
				9.04	5.30	[8]
	274.7	80.7	77.7	8.65	5.02	This study
Andradite				8.49	4.73	[6]
			87.9	8.47	4.96	[8]
	289	92	85	9.05	5.09	[7]
	289	92	85	8.38	4.95	[39]
	285.5	85.1	82.7	8.30	4.77	This study

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