NaCl-O2体系高温高压化学反应的拉曼光谱证据

田雨 刘雪廷 何运鸿 赵慧芳 姜峰 谭大勇 肖万生

田雨, 刘雪廷, 何运鸿, 赵慧芳, 姜峰, 谭大勇, 肖万生. NaCl-O2体系高温高压化学反应的拉曼光谱证据[J]. 高压物理学报, 2017, 31(6): 692-697. doi: 10.11858/gywlxb.2017.06.003
引用本文: 田雨, 刘雪廷, 何运鸿, 赵慧芳, 姜峰, 谭大勇, 肖万生. NaCl-O2体系高温高压化学反应的拉曼光谱证据[J]. 高压物理学报, 2017, 31(6): 692-697. doi: 10.11858/gywlxb.2017.06.003
TIAN Yu, LIU Xue-Ting, HE Yun-Hong, ZHAO Hui-Fang, JIANG Feng, TAN Da-Yong, XIAO Wan-Sheng. Raman Evidences of Chemical Reaction of NaCl-O2 System at High Pressure and High Temperature[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 692-697. doi: 10.11858/gywlxb.2017.06.003
Citation: TIAN Yu, LIU Xue-Ting, HE Yun-Hong, ZHAO Hui-Fang, JIANG Feng, TAN Da-Yong, XIAO Wan-Sheng. Raman Evidences of Chemical Reaction of NaCl-O2 System at High Pressure and High Temperature[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 692-697. doi: 10.11858/gywlxb.2017.06.003

NaCl-O2体系高温高压化学反应的拉曼光谱证据

doi: 10.11858/gywlxb.2017.06.003
基金项目: 

国家自然科学基金 41572030

国家重点研发计划“深地资源勘查开采”重点专项 2016YFC0600408

详细信息
    作者简介:

    田雨(1990-), 男, 博士研究生, 主要从事高压矿物学研究.E-mail:tianyu@gig.ac.cn

    通讯作者:

    肖万生(1968-), 男, 博士, 研究员, 主要从事高压矿物物理研究.E-mail:wsxiao@gig.ac.cn

  • 中图分类号: O521.2;P311.9

Raman Evidences of Chemical Reaction of NaCl-O2 System at High Pressure and High Temperature

  • 摘要: 利用金刚石压腔装置和显微激光双面加热技术,对NaCl-O2体系在高温高压下的化学反应进行研究。在55 GPa下对样品进行激光加热,使温度达到1 500~2 000 K,然后在常温下对产物进行拉曼光谱测量。测试数据显示,NaCl-O2体系在上述温压条件下发生了化学反应,产物包括NaO4、NaCl3等非传统化合物,以及少量的NaClO4和中间产物Cl2。易吸潮的NaO4黑色粉末在常压下仍稳定存在,其1 384 cm-1特征振动峰反映其结构中存在带分数负电荷的O-O原子对。斜方结构NaCl3表现出强的拉曼信号,可分辨出10个拉曼峰,并在卸压过程中于23 GPa左右完全分解为NaCl+Cl2。实验结果表明,高压有利于O元素和Cl元素以非常规阴离子对或聚阴离子的形式出现,并表现出异于常压和较低压时的化学反应特性。这些特性是否具有普遍性还需要更多的实验体系证实。研究结果为探讨地幔深处氧可能的非常规存在方式提供了新的证据。

     

  • 图  NaCl-O2体系高温高压化学反应前后代表性拉曼光谱

    (曲线a为加热前测量结果(55.1 GPa),反映ε-O2的信号;曲线b和曲线c(53.5 GPa)代表加热后不同测量点的拉曼光谱,曲线d为57 GPa时斜方结构(Pnma)NaCl3的拉曼光谱[12],与曲线c对照)

    Figure  1.  Representative high pressure Raman spectra of experimental NaCl-O2 system obtained before and after high temperature and high pressure chemical reaction

    (The curve a (55.1 GPa) presents the observed result of the sample before heating, which is the Raman signal of ε-O2 under this pressure; both curve b and curve c (53.5 GPa) present the Raman spectra measured at various positions after heating; curve d, cited from Ref.[12] for comparison with the 53.5 GPa curve c, is the Raman spectrum of the orthorhombic (Pnma) NaCl3 at 57 GPa.)

    图  常压下NaO4黑色粉末的1 384 cm-1特征拉曼峰

    Figure  2.  Characteristic 1 384 cm-1 Raman band of the black NaO4 powder sample in ambient conditions

    图  卸压过程中测量的固体Cmca-Cl2的拉曼光谱(6.9 GPa时)和NaClO4的拉曼光谱(0.1 MPa)

    Figure  3.  Observed Raman spectra of solid Cmca-Cl2 under 6.9 GPa and NaClO4 under 0.1 MPa in decompression

    表  1  53.5 GPa压力下实验观测的斜方结构NaCl3(Pnma)拉曼谱带频率

    Table  1.   Raman modes of the orthorhombic NaCl3 (Pnma) observed at 53.5 GPa

    (cm-1)
    ν1 ν2 ν3 ν4 ν5 ν6 ν7 ν8 ν9 ν10
    204 218 246 284 305 336 388 408 428 480
    下载: 导出CSV
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  • 收稿日期:  2017-06-02
  • 修回日期:  2017-06-08

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