Lattice Vibrations and Heat Transport in Dielectric Solids

介电固体中的晶格振动和热传输

• 批准号: 8714788
• 负责人: Robert Pohl
• 金额: $ 39.6万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-01 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714788&HistoricalAwards=false
• 关键词: Lattice; Vibrations; Heat; Transport; Dielectric

They propose to study several important questions about phonons in amorphous and crystalline solids, mainly through thermal conductivity measurements. One of these questions is that of the heat flow in amorphous solids in the temperature range 10 - 300 K, with the goal of understanding the transition of the phonon picture to that of a random walk of the elastic energy. They will also continue their work on disordered crystals displaying glass-like thermal properties, in order to test several models that have been advanced as explanations. They will use these models in an attempt at identifying other disordered crystals displaying glass-like properties. Their ultimate goal is to apply their knowledge to amorphous solids, and to understand their excitations. They will also propose an investigation of phonon scattering at crystal surfaces, in order to understand and identify important scattering mechanisms. Here, their goal is to use phonons as sensitive low energy probes for surfaces.

他们建议主要通过热导测量来研究非晶态和晶态固体中有关声子的几个重要问题。其中一个问题是在10-300K温度范围内非晶态固体中的热流问题，目的是了解声子图向弹性能随机游动的转变。他们还将继续对表现出玻璃般的热性能的无序晶体进行研究，以测试作为解释而提出的几个模型。他们将使用这些模型来尝试识别其他表现出玻璃性质的无序晶体。他们的最终目标是将他们的知识应用于无定形固体，并理解它们的激发。他们还将提议对晶体表面的声子散射进行研究，以了解和识别重要的散射机制。在这里，他们的目标是使用声子作为灵敏的低能探测器来探测表面。