榍石的冲击高压行为与辐照损伤效应对比研究

刘孙利; 白彬; 贺红亮; 褚健; 孙亚平; 王绪; 王洪龙; 张铭

doi:10.11858/gywlxb.20180546

榍石的冲击高压行为与辐照损伤效应对比研究

doi: 10.11858/gywlxb.20180546

刘孙利^1,,
白彬^1,*, ,,
贺红亮²,
褚健¹,
孙亚平¹,
王绪¹,
王洪龙¹,
张铭^1,*, ,

1.
中国工程物理研究院材料研究所，四川江油　621907
2.
中国工程物理研究院流体物理研究所，四川绵阳　621999

基金项目: 国家自然科学基金（41372055）

详细信息

作者简介:
刘孙利(1989－)，男，硕士，主要从事放射性废物处理与处置研究.E-mail:liusunli@126.com

通讯作者:
白　彬(1968－)，男，主要从事放射性废物处理与处置研究. E-mail: baibin@caep.cn

张　铭(1956－)，男，主要从事放射性废物处理与处置研究. E-mail: mzhanguk@gmail.com

中图分类号: O521.2
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出版历程
- 收稿日期: 2018-04-24
- 修回日期: 2018-05-30

A Comparative Study on Influence of High-Pressure Shocking and Radiation Damage on Titanite

LIU Sunli^1
,,
BAI Bin^{1,*
, ,},
HE Hongliang²,
CHU Jian¹,
SUN Yaping¹,
WANG Xu¹,
WANG Honglong¹,
ZHANG Ming^{1,*
, ,}

1.
Institute of Materials, China Academy of Engineering Physics，Jiangyou 621907, China
2.
Institute of Fluid Physics, China Academy of Engineering Physics，Mianyang 621999, China

摘要

摘要: 高压和辐照这两种极端条件会造成晶体材料的晶体结构发生改变或损伤。以榍石(CaTiSiO₅)为研究对象，利用冲击高压和样品回收技术，探索冲击高压作用后结构的变化规律，并与辐照造成的损伤榍石作对比研究，认识冲击高压与辐照造成榍石结构损伤的异同。研究表明：冲击高压作用下，晶态的榍石出现结构损伤和非晶化，出现类似于榍石的辐照损伤现象，但具体过程和受损的晶体结构有明显不同。具体表现为：X射线衍射、红外和拉曼光谱的特征峰强度减弱，谱线变宽，细节丢失；冲击高压导致晶态榍石拉曼光谱的Ti–O伸缩振动主峰出现红移，与辐照损伤蜕晶化过程出现的蓝移相反。此外，晶胞参数a、b、c和晶胞体积V减小，与辐照损伤过程相反。
- 榍石 /
- 冲击 /
- 高压 /
- 辐照损伤 /
- 非晶化
Abstract: High pressure shock and α-decay radiation are two extreme conditions capable of leading to damages on crystal lattices of solid materials. The present work investigated the influence of shocking on the structural variations of titanite (CaTiSiO₅) using a gas gun shock-wave technology. The results were used to compare the similarities and differences in spectral and structural changes between shocked and α-decay radiation damaged titanite, as α-decay radiation process was considered as involved in a fast high pressure process. The results showed that high pressure shock and α-decay radiation can both produce defective crystal lattice and even amorphous phases in titanite, resulting in a decrease in band intensity, a line boarding and a loss of spectral details in X-ray diffraction patterns, infrared and Raman spectra. However, there are distinct differences in the detailed processes and damage mechanisms between the two processes. High-pressure shock causes the main peak of the Ti-O stretching vibration in titanite shifts to a lower frequency, which is opposite to its behaviour in radiation damaged samples. Furthermore, shocking leads to a reduction of unit cell parameters a, b, c and cell volume V, quite contrary to a unit-cell swelling caused by radiation damage.
- titanite /
- shock /
- high pressure /
- radiation damage /
- amorphous

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图 1 榍石晶体结构示意

Figure 1. Schematic crystal structure of titanite

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图 2 样品回收装置示意图

Figure 2. Schematic diagram of sample recovery unit

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图 3 合成的晶态榍石及经61.4 GPa和83.8 GPa压强冲击后榍石的XRD谱

Figure 3. XRD patterns of synthetic crystalline, 61.4 GPa and 83.8 GPa pressure shocked titanite

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图 4 辐照损伤榍石和83.8 GPa冲击榍石XRD图谱

Figure 4. XRD patterns of radiation damaged and 83.8 GPa shocked titanite

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图 5 合成的晶态榍石及经61.4和83.8 GPa压强冲击后的榍石拉曼光谱

Figure 5. Raman spectra of synthetic crystalline, 61.4 GPa and 83.8 GPa shocked titanite

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图 6 合成晶态榍石及经61.4和83.8 GPa冲击后榍石的红外光谱（插图显示Si-O弯曲振动峰和Si-O伸缩振动峰的半峰宽随压力变化情况）

Figure 6. Infrared spectra of synthetic crystalline, 61.4 GPa and 83.8 GPa pressure shocked titanite, with insection showing FWHMs of Si-O bending and Si-O stretching vibration as varying with shock pressure

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图 7 辐照损伤榍石和83.8 GPa冲击榍石拉曼光谱

Figure 7. Raman spectra of radiation damaged and 83.8 GPa shocked titanite

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图 8 辐照损伤榍石和83.8 GPa冲击榍石的红外光谱

Figure 8. Infrared spectra of radiation damaged and 83.8 GPa shocked titanite

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表 1 XRD谱结构精修数据

Table 1. Rietveld refinement data by XRD patterns

Pressure/GPa	a/Å	b/Å	c/Å	β/(^o)	V/Å³	wRp	Rp	C²
0	7.10	8.77	6.60	113.82	376.37	0.11	0.08	3.79
61.4	7.06	8.74	6.58	113.81	371.75	0.07	0.06	3.08
83.8	7.05	8.72	6.56	113.79	368.86	0.04	0.04	1.18

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表 2 高压冲击和核辐照对榍石各基团的影响

Table 2. Influence of shock and α-decay radiation on structural units of crystalline titanite

Structural unit	Impact of shock	α-decay radiation
[CaO₇] polyhedra	Decrease in IR intensity by 63%	Decrease in IR intensity by 49%
[TiO₆] octahedra	Decrease in IR intensity by 61%	Decrease in IR intensity by 77%
[SiO₄] tetrahedra	Increase in IR band width by 19%	Increase in IR band width by 59%

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