发表机构
Peking University（北京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究报道了同位素超纯单晶金刚石（13C含量约0.00024%）的室温导热率约为3100 W m-1 K-1，显著高于天然金刚石，但表明极端纯化下存在其他声子散射机制（如空位缺陷）。
AI 中文摘要
金刚石是天然材料中导热率最高的材料。减少同位素散射可以进一步突破金刚石导热率的极限。在此，我们报道了一种具有极低ppm级13C含量的金刚石单晶的室温导热率。二次离子质谱（SIMS）显示13C浓度仅为约0.00024%，且其他杂质可忽略不计，使该样品成为迄今报道的最同位素纯化的金刚石样品之一。时域热反射测量显示室温导热率约为3100 W m-1 K-1。尽管该值显著高于天然金刚石，但仍与较不纯的12C金刚石的最佳报道值相当。这一结果表明，在此极端同位素纯化水平下，可能存在除同位素散射之外的其他声子散射机制。空位缺陷可能对导热率的剩余抑制有所贡献。
英文摘要
Diamond has the highest thermal conductivity among natural materials. Reducing isotope scattering can further push the limit of thermal conductivity of diamond. Here, we report the room-temperature thermal conductivity of a diamond single crystal with an exceptionally low ppm-level 13C content. Secondary ion mass spectrometry (SIMS) reveals a 13C concentration of only ~0.00024% and negligible other impurities, placing this sample as the most isotopically purified diamond samples reported to date. Time-domain thermoreflectance measurements show a room-temperature thermal conductivity of ~3100 W m-1 K-1. Although this value is markedly higher than that of natural diamond, it remains comparable to the best reported values for less isotopically 12C pure diamond. This result suggests that additional phonon-scattering mechanisms beyond isotope scattering may exist at this extreme isotopic purification level. Vacancy defects may contribute to the remaining suppression of thermal conductivity.
