吉帕压力下原位中子衍射技术及其在铁中的应用

房雷鸣; 陈喜平; 谢雷; 夏元华; 李昊; 孙光爱; 陈波

doi:10.11858/gywlxb.2016.01.001

吉帕压力下原位中子衍射技术及其在铁中的应用

doi: 10.11858/gywlxb.2016.01.001

中国工程物理研究院核物理与化学研究所，四川绵阳 621999

基金项目:

国家自然科学基金 11427810

中国工程物理研究院中子物理学重点实验室开放课题 2014AB02

详细信息

作者简介:
房雷鸣(1980-), 男, 博士, 副研究员, 主要从事高压原位中子衍射研究.E-mail:flmyaya2008@163.com

中图分类号: O521.2;O521.3;O571.56
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出版历程
- 收稿日期: 2014-12-02
- 修回日期: 2015-02-10

High Pressure In-Situ Neutron Diffraction under Gigapascal of Iron

Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621999, China

摘要

摘要: 中子对轻元素敏感，能够识别近邻原子，区分同位素，可以直接测定材料的磁结构，并具有很强的穿透力。这些优点使中子衍射成为研究物质的一种独特手段，在含能材料、含水矿物、超导以及磁材料等都发挥着重要的作用。利用自主研制的全景式大腔体对顶砧高压装置，实现了吉帕压力下原位中子衍射谱的获取。实验中采用WC压砧，当负载压力达到150kN时，在体积为6mm³的样品腔内获得了铁在5GPa压力下的中子衍射谱。通过优化组装或使用金刚石压砧，可以获得10GPa甚至更高压力下的高压原位中子衍射谱。
- 高压 /
- 原位中子衍射 /
- 铁 /
- 大腔体对顶砧
Abstract: The unique properties of neutron, such as its sensitivity to light elements and isotope, its capability of detecting magnetic structures, and its high penetrating power, make neutron diffraction an almost perfect method for scattering investigation of various materials, such as energetic compounds, hydrous minerals, superconductors, and magnetic materials.Based on a newly built and operated neutron source at Mianyang (China Mianyang Research Reactor, CMRR), we have been able to establish and develop some high pressure in-situ neutron diffraction techniques.With our own developed large-volume panoramic-type opposed anvil cell, we are currently able to collect the in-situ neutron diffraction patterns under a high pressure beyond gigapascal, and by employing the tungsten carbide anvil and applying the loading force at 150kN, we compressed the iron sample of 6mm³ volume up to 5GPa and collected neutron diffraction patterns within a few hours.By optimizing and combining our techniques, or by using the diamond anvil cell, we can obtain a spectrum of in-situ neutron diffraction under pressures that may be extended to over 10GPa.
- high pressure /
- in-situ neutron diffraction /
- iron /
- large-volume opposed anvil cell

HTML全文

图 1a 高压中子衍射谱仪

Figure 1a. High-pressure neutron diffraction spectrometer

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1b 高压加载系统

1b. High-pressure loading system

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图 2 Fe在TiZr封垫中的示意图(左)和实物图(右)

Figure 2. Schematic diagram (left) and picture (right) ofactual TiZr gasket with iron sample located

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图 3 Fe的高压原位中子衍射谱(压砧砧面直径为8mm)

Figure 3. High pressure in-situ neutron diffraction patternof iron (with 8mm as culet diameter for WC)

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图 4 Fe的高压原位中子衍射谱(压砧砧面直径为4mm)

Figure 4. High pressure in-situ neutron diffraction patternof iron (with 4mm as culet diameter for WC)

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图 5 Fe(bcc)的V-p曲线

Figure 5. The V-p curve of bcc iron

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图 6 负载和压砧位移随时间的变化关系(插图为封垫的横截面，(a)、(b)和(c)分别为原始封垫以及施加50和150kN负载后的封垫)

Figure 6. Force loading and anvil displacement as a function of experimental time(The inset is the cross-section of the gasket.(a) original gasket; (b) gasketcompressed by 50kN loading; and (c) gasket compressed by 150kN loading)

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表 1 不同压力下Fe的晶格常数

Table 1. Lattice parameters of iron at different pressures

Sample volume/(mm³)	Loading force/(kN)	a/(nm)	V/(nm³)	p/(GPa)
59	200	0.2861	0.023426	0.88
59	250	0.2860	0.023405	1.05
59	290	0.2858	0.023353	1.40
6	150	0.2842	0.022950	4.76

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