Abstract

The effect metal additives (7 at %) have оn phase transformations at pressures of 2 and 8 GPa in the temperature range of 500–1100°C in C₆₀ and C₇₀ fullerites is studied via Raman spectroscopy and neutron and X-ray diffraction. It is shown that carbide-forming elements, Fe and Al, strongly (by hundreds of degrees) raise the temperature of transformation of fullerenes into disorientated graphite, while non-carbide-forming element Ag does not have such an effect. The stabilization effect of crystalline fullerenes is explained using known data on the interaction between metal atoms and fullerene molecules, and compared to the processes of fulleride formation.

中文翻译：

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富勒烯与金属添加剂在高压和高温下的相变

摘要

通过拉曼光谱以及中子和 X 射线衍射，在 500–1100°C 的温度范围内，在 C ₆₀和 C ₇₀富勒体中，金属添加剂（7 原子％）具有 оn 相变。结果表明，碳化物形成元素 Fe 和 Al 强烈（数百度）提高了富勒烯向无取向石墨的转变温度，而非碳化物形成元素 Ag 没有这种影响。结晶富勒烯的稳定作用是使用金属原子和富勒烯分子之间相互作用的已知数据解释的，并与富勒烯形成过程进行比较。