NaCl-O_2体系高温高压化学反应的拉曼光谱证据
Raman Evidences of Chemical Reaction of NaCl-O_2 Systemat High Pressure and High Temperature
查看参考文献25篇
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文摘
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利用金刚石压腔装置和显微激光双面加热技术,对NaCl-O_2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1500~2000 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-O_2体系在上述温压条件下发生了化学反应,产物包括NaO_4、NaCl_3等非传统化合物,以及少量的NaClO_4和中间产物Cl_2。易吸潮的NaO_4黑色粉末在常压下仍稳定存在,其1384 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NaCl_3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+Cl_2。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。 |
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其他语种文摘
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In this study we studied the chemical reaction of the NaCl-O_2 system under high pressure and high temperature using the diamond anvil cell apparatus and the double-sided laser heating technology.The sample was heated to about 1500-2000 K under a pressure of 55 GPa,and then analyzed by the Raman measurement at room temperature.The determined data show that the NaCl-O_2 system undergoes a chemical reaction under the above-mentioned pressure and temperature conditions.The products include the nontraditional compounds of NaO_4 and NaCl_3,as well as a small amount of NaClO_4 and intermediate product Cl_2.The black NaO_4 powder,being apt to absorb moisture,can still exist in the ambient condition.The diagnostic zero-pressure Raman band of 1384 cm~(-1),assigned to the symmetric stretching vibration of the O_4~-anion in NaO_4,suggests the occurrence of O-O atom pair with a negative fractional valence in the structure.The orthorhombic structure of NaCl_3 exhibited a strong Raman signal,which could distinguish 10 Raman peaks in our measurements.It decomposes into NaCl+Cl_2 under about 23 GPa on decompression.The experimental results suggest that both elements of oxygen and chlorine prefer to occur in the unconventional form of pair-anions or polyanions caused by their unique chemical reactivity under high pressure,differing from that in atmospheric and lower pressure environments.It requires more robust evidences from various experimental systems to confirm whether these properties of oxygen and chlorine under high pressure are universal.Oxygen is one of the most important constituent elements on Earth,and most of the Earth is in high temperature and high pressure environment.This study provides new evidence for the possible unconventional existence of oxygen in the mantle. |
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来源
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高压物理学报
,2017,31(6):692-697 【核心库】
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DOI
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10.11858/gywlxb.2017.06.003
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关键词
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NaCl-O_2体系
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高温高压
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拉曼光谱
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NaO_4
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NaCl_3
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地址
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室;;广东省矿物物理与材料研究开发重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-5773 |
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学科
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物理学;地球物理学 |
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基金
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国家自然科学基金
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国家重点研发计划"深地资源勘查开采"重点专项
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文献收藏号
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CSCD:6110535
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