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纳米二氧化铈的高压拉曼光谱研究

High-pressure Raman Studies of Nanocrystalline CeO_2
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摘要 本文利用金刚石对顶砧高压技术,在0.1MPa~47.5GPa压力范围内对粒径为8nm的纳米CeO2进行了高压拉曼光谱研究。研究结果表明,常压下萤石结构的纳米CeO2(空间群Fm3m)在24.3GPa时开始发生萤石结构到PbCl2类型(空间群Pnam)的结构相变。这个相变为可逆相变,卸压至零压时样品恢复至萤石结构。 Raman scattering spectroscopy of nanocrystalline CeO2 with mean particle size of 8 nm was studied under high pressure from 0.1 MPa to 47.5 GPa.A phase transition from fluorite(Fm3m)to PbCl2-type(Pnam)structure was observed at 24.3 GPa.On decompression,the high-pressure phase remained down to 5.2 GPa and then returned to the flourite structure at ambient conditions.
出处 《光散射学报》 北大核心 2010年第3期272-275,共4页 The Journal of Light Scattering
基金 国家自然科学基金(10979001) 国家重点基础研究发展规划(2005CB724400)
关键词 高压 相变 纳米CEO2 拉曼光谱 high-pressure transition nanocrystalline CeO2 Raman spectroscopy
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参考文献10

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