Abstract Boron carbide BxC ( x = 1 / 6 − 10 ) powders were synthesized through a microwave-assisted carbothermic reduction reaction as a potential clean energy material. Their crystallographic structures and optical properties were characterized. X-ray diffraction and electron diffraction indicated that the synthesized BxC powders were amorphous. Electron energy-loss spectroscopy demonstrated that the composition of boron and carbon was in amorphous materials, and their chemical bonding were disclosed from Raman scattering spectroscopy. UV-vis absorption spectroscopy indicated that the bandgap of the bulks varied from 2.30eV to 3.90eV, tuned by the boron/carbon element ratio. The synthesized powders were potential photovoltaic materials. A short-range ordering model was established to explain the optical properties.

中文翻译：

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带隙可调的碳化硼非晶固体

摘要 通过微波辅助碳热还原反应合成了碳化硼 BxC ( x = 1 / 6 − 10 ) 粉末作为潜在的清洁能源材料。表征了它们的晶体结构和光学性质。X 射线衍射和电子衍射表明合成的 BxC 粉末是无定形的。电子能量损失光谱表明硼和碳的组成为无定形材料，拉曼散射光谱揭示了它们的化学键合。UV-vis 吸收光谱表明块体的带隙从 2.30eV 变化到 3.90eV，由硼/碳元素比调节。合成的粉末是潜在的光伏材料。建立了一个短程排序模型来解释光学特性。