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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Low-frequency Raman scattering under high pressure in diamond anvil cell: Experimental protocol and application to GeO _2 and SiO _2 boson peaks
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Low-frequency Raman scattering under high pressure in diamond anvil cell: Experimental protocol and application to GeO _2 and SiO _2 boson peaks

机译：金刚石砧室中高压下的低频拉曼散射：GeO _2和SiO _2玻色子峰的实验方案及其应用

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摘要

Low frequency vibrations, a universal feature of amorphous solids which is responsible for thermodynamical anomalies at low temperature, are complicated to record in high pressure device, notably because of the closeness of the elastic line. We first present an experimental protocol allowing to record the in situ low-frequency Raman scattering of samples under high pressure in the diamond anvil cell apparatus with a high quality. This protocol is particularly adapted to study the evolution of the boson peak of glassy materials. The second part is dedicated to the study of the boson peak of a-GeO _2, a typical strong glass. The results, which clearly show the non-Debye behaviour of this material at the beginning of the compression where an anomalous compression takes place, are compared to previous measurements on a-SiO _2. Interpretation in terms of local structural transitions and discussions about the elastic nanoheterogeneities of the amorphous state are addressed.
机译：低频振动是造成低温下热力学异常的非晶态固体的普遍特征，在高压设备中记录起来很复杂，这主要是由于弹性线的紧密性。我们首先提出一种实验方案，该方案可以在高质量的金刚石砧座装置中记录高压下样品的原位低频拉曼散射。该协议特别适用于研究玻璃态材料玻色子峰的演化。第二部分专门研究典型的强玻璃a-GeO _2的玻色子峰。结果清楚地表明了这种材料在压缩开始时发生异常压缩的非德拜行为，并将其与先前在a-SiO _2上的测量结果进行了比较。解决了局部结构转变方面的解释和有关非晶态弹性纳米异质性的讨论。

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