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The microstructure of a material determines its macroscopic properties. In this study, coal with varying degrees of metamorphism was selected as raw materials. High-temperature graphitization was carried out under the same heat treatment conditions following different pretreatment. The coal-based graphite with different microstructure (polycrystalline graphite, monocrystalline graphite, spherical graphite, honeycomb graphite, and rod-like graphite) were obtained. The results show that the graphitization effect of high-rank coal is better than that of low-rank coal but the graphitization degree of products can be greatly improved after pretreated by pickling. Their resistivity is the same order of magnitude as that of natural graphite, and they all have porous structures with large specific surface areas. They are not only good semeconductor materials but also have potential applications in other fields based on their interesting microstructrues.
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Qiu et al. (2019) studied this question.
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