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Thermal Conductivity of SiC Microwires: Effect of Temperature and Structural Domain Size Uncovered by 0 K limit Phonon Scattering
Ceramics International ( IF 5.2 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.ceramint.2018.03.161 Bowen Zhu , Ridong Wang , Shay Harrison , Kirk Williams , Ram Goduguchinta , John Schneiter , Joseph Pegna , Erik Vaaler , Xinwei Wang
Ceramics International ( IF 5.2 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.ceramint.2018.03.161 Bowen Zhu , Ridong Wang , Shay Harrison , Kirk Williams , Ram Goduguchinta , John Schneiter , Joseph Pegna , Erik Vaaler , Xinwei Wang
Abstract A comparative study of structure and thermal properties is reported for three 3C crystalline silicon carbide (SiC) microwires, including Sylramic, Hi-Nicalon S and a sample fabricated by laser chemical vapor deposition (LCVD). Structural characterization by Raman spectroscopy and x-ray diffraction (XRD) finds that the LCVD-based sample contains excessive silicon and smallest grains of SiC but detectable free carbon. Thermal characterization from room temperature down to 20 K uncovers the effect of nanosized grain on thermal properties. The thermal properties are correlated with the structure via structural thermal domain (STD) size, defined as the grain boundary-induced phonon mean free path at the 0 K limit. The STD size of the three samples is found as 9.35, 1.42 and 1.03 nm for the Sylramic, Hi-Nicalon S and LCVD SiC fibers, proportional to and nearly one order of magnification smaller than the corresponding crystalline size determined by XRD: 67–113, 14.6–18.4, and 5.85–7.84 nm.
中文翻译:
碳化硅微丝的热导率:0 K 极限声子散射揭示的温度和结构域尺寸的影响
摘要 对三种 3C 晶体碳化硅 (SiC) 微线,包括 Sylramic、Hi-Nicalon S 和通过激光化学气相沉积 (LCVD) 制造的样品进行了结构和热性能的比较研究。通过拉曼光谱和 X 射线衍射 (XRD) 进行的结构表征发现,基于 LCVD 的样品含有过量的硅和最小的 SiC 晶粒,但可检测到游离碳。从室温到 20 K 的热表征揭示了纳米颗粒对热性能的影响。热特性通过结构热域 (STD) 尺寸与结构相关,定义为 0 K 极限下晶界诱导的声子平均自由程。对于 Sylramic、Hi-Nicalon S 和 LCVD SiC 纤维,三个样品的 STD 尺寸分别为 9.35、1.42 和 1.03 nm,
更新日期:2018-07-01
中文翻译:
碳化硅微丝的热导率:0 K 极限声子散射揭示的温度和结构域尺寸的影响
摘要 对三种 3C 晶体碳化硅 (SiC) 微线,包括 Sylramic、Hi-Nicalon S 和通过激光化学气相沉积 (LCVD) 制造的样品进行了结构和热性能的比较研究。通过拉曼光谱和 X 射线衍射 (XRD) 进行的结构表征发现,基于 LCVD 的样品含有过量的硅和最小的 SiC 晶粒,但可检测到游离碳。从室温到 20 K 的热表征揭示了纳米颗粒对热性能的影响。热特性通过结构热域 (STD) 尺寸与结构相关,定义为 0 K 极限下晶界诱导的声子平均自由程。对于 Sylramic、Hi-Nicalon S 和 LCVD SiC 纤维,三个样品的 STD 尺寸分别为 9.35、1.42 和 1.03 nm,