金刚烷的高压拉曼光谱研究

黄艳萍; 崔田

doi:10.11858/gywlxb.20190832

金刚烷的高压拉曼光谱研究

doi: 10.11858/gywlxb.20190832

黄艳萍,
崔田

吉林大学物理学院，吉林长春　130012

基金项目: 国家自然科学基金（51572108, 51632002）；教育部长江学者和创新团队发展计划（IRT_15R23）；国家基础科学人才培养基金（J1103202）；高等学校学科创新引智计划（B12011）

详细信息

作者简介:
黄艳萍（1987－），女，博士，工程师，主要从事高压合成及物性测量研究. E-mail：huangyp1124@jlu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2019-09-05
- 修回日期: 2019-09-11

Raman Scattering Investigations of Adamantane under High Pressure

College of Physics, Jilin University, Changchun 130012, China

摘要

摘要: 对金刚烷（C₁₀H₁₆）进行了常温原位高压拉曼光谱研究，最高压力为25 GPa。通过分析高压拉曼光谱，结合拉曼频移随压力的变化情况，得出在实验压力范围内C₁₀H₁₆发生了多次相变。0.6 GPa时，C₁₀H₁₆由常温常压下的无序相（ $\alpha$ 相）转变为有序相（ $\beta$ 相）；继续加压至1.7 GPa时，第2次结构相变开始，直至3.2 GPa，第2次相变完全结束；第3次相变开始于6.3 GPa，结束于7.7 GPa；22.9 GPa时发生了第4次结构相变。另外，首次在拉曼光谱上探测到第3次相变过程中晶格振动峰的变化，说明第3次相变并非前人报道的等结构相变。
- 金刚烷 /
- 高压 /
- 拉曼散射 /
- 相变
Abstract: Results of Raman scattering measurements under pressure up to 25 GPa on adamantane (C₁₀H₁₆) carried out at room temperature are reported. The analysis of Raman data indicated four phase transitions. The ambient pressure disordered Fm3m structure ( $\alpha$ -C₁₀H₁₆) transformed to a high pressure ordered phase at 0.6 GPa. Continue to pressurize to 1.7 GPa, the second structure phase transition began, and completely accomplished until 3.2 GPa. The third transition began at 6.3 GPa, ended at 7.7 GPa. C₁₀H₁₆ transformed to a new phase at 22.9 GPa. Because of the new lattice peak occurred during the third transition, it was defined to a first-order transition.
- adamantane /
- high pressure /
- Raman scattering /
- phase transition

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图 1 常温常压下金刚烷的拉曼谱

Figure 1. Raman spectrum collected at ambient conditions

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图 2 298 K、低于25 GPa压力下C₁₀H₁₆的晶格振动峰及其拉曼频移随压力的变化

Figure 2. Lattice vibration modes of solid C₁₀H₁₆ measured to 25 GPa at 298 K (a) and the pressure dependence of the corresponding Raman shift (b)

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图 5 C₁₀H₁₆的C–H伸缩振动峰(2800～3100 cm^–1)(a)及其拉曼频移(b)随压力的变化

Figure 5. Representative Raman spectra of C₁₀H₁₆ of C–H stretching modes (a) and the Raman shift versus pressure (b) in the frequency range of 2800–3100 cm^–1

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图 4 C₁₀H₁₆的内模振动峰(1300～1500 cm^–1)(a)及其拉曼频移(b)随压力的变化

Figure 4. Representative Raman spectra of C₁₀H₁₆ of internal vibrational modes (a) and the Raman shift versus pressure (b) in the frequency range of 1300–1500 cm^–1

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图 3 C₁₀H₁₆的内模振动峰(700～1300 cm^–1)(a)及其拉曼频移随压力的变化(b)

Figure 3. Representative Raman spectra of C₁₀H₁₆ of internal vibrational modes (a) and the Raman shift versus pressure (b) in the frequency range of 700–1300 cm^–1

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表 1 常温常压下金刚烷拉曼振动峰的指认以及与文献的对比

Table 1. Assignments and vibrational frequencies (cm^–1) of observed Raman modes of C₁₀H₁₆ at ambient condition

Frequency/cm^–1					Mode
This work	Ref.[20]	Ref.[17]	Ref.[16]	Assignment	Mode
2941	2944	2943	2940	$\nu _{18}$	C–H stretching mode
2916	2917	2913	2915	$\nu _{17}$	C–H stretching mode
2893	2895	2983	2894	$\nu _{16}$	C–H stretching mode
2847		2845	2847	$\nu _{15}$	C–H stretching mode
	1474
	1450
1434	1437	1440	1435	$\nu _{14}$	CH₂ scissor mode
1367	1371			$\nu _{13}$	CH bending mode
	1315
1225	1223	1225	1221	$\nu _{12}$	CH bending mode
1197				$\nu _{11}$
1193				$\nu _{10}$
1097		1102	1097	$\nu _{9}$	C–H rock mode
974	972	976	971	$\nu _{8}$	C–C stretching mode
950	951			$\nu _{7}$	C–C stretching mode
761	760	759	759	$\nu _{6}$	C–C stretching mode
640				$\nu _{5}$	Lattice mode
441	443	440	442	$\nu _{4}$	C–C–C deformation mode
399				$\nu _{3}$	Lattice mode
187				$\nu _{2}$	Lattice mode
184				$\nu _{1}$	Lattice mode

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