Infrared phonon modes and local structure of amorphous and crystalline LaLuO3 thin films

Infrared phonon modes and local structure of amorphous and crystalline LaLuO3 thin films
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非晶态和晶态 LaLuO3 薄膜的红外声子模式和局域结构

DOI:
10.1016/j.jallcom.2013.03.240
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发表时间:
2013-09
影响因子:
6.2
通讯作者:
Pan, Guoqiang
Pan, Guoqiang
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhang, Guobin;Li, Tingting;Li, Chengxiang;Pan, Guoqiang

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利用红外光谱和X射线吸收精细结构(XAFS)研究了非晶态和晶态LaLuO3薄膜的红外声子模式和局域结构。红外光谱表明,晶体薄膜保留了主要的红外声子模式,并保持了与晶体块状样品相同的静态介电常数。但非晶薄膜的红外声子模式减少,导致静态介电常数降低。结果与 XAFS 揭示的局部结构密切相关。晶体薄膜具有与晶体块体样品相似的局部结构,而非晶薄膜则呈现出明显的变化。非晶薄膜局部结构的不同导致声子模式和静态介电常数的变化。
The infrared phonon modes and local structure of amorphous and crystalline LaLuO3thin films were studied by infrared spectroscopy and X-ray absorption fine structure (XAFS). The infrared spectroscopy shows that the crystalline thin film keeps the main infrared phonon modes and preserves the static dielectric constant as crystal bulk sample. But the infrared phonon modes of amorphous thin film reduce and cause the static dielectric constant to decrease. The result is closely related to the local structure as revealed by XAFS. The crystalline thin film has the similar local structure as crystal bulk sample, while the amorphous thin film presents obvious change. The different local structure of the amorphous thin film results in the change of phonon modes and static dielectric constant.
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影响因子: --
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