Changes of the lattic constants and crystallite sizes of various types of carbons with heat treatment

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<jats:title>Abstract</jats:title> <jats:p>Two kinds of cokes, six kinds of carbon black and a charcoal were heat-treated at temperatures between 1500 and 3400°C in a resistance furnace under atmospheric pressure. The lattice constants and crystallite sizes of these carbons were measured by means of the X-ray diffraction method, using extra-pure silicon as an inner standard.</jats:p> <jats:p>The co values of the graphitizing carbons, such as the petroleum coke and the pitch coke, were not less than 6.718Å, even when these carbons were heat-treated at 3400°C. It was concluded that the graphitizability of carbon was affected by its original texture even at such a high temperature as 3400°C.</jats:p> <jats:p>The co value of carbon black became smaller and the value of Lc, larger with the increase in the particle size of carbon black. It has been said that the particle size is the main limiting factor for the growth of graphite crystallite in carbon black, but the experimental results suggest that such other properties as micropores may also be limiting factors.</jats:p> <jats:p>The discrepancy between the Lc values calculated from the (002) and (004) diffractions was accounted for by the heterogeneity of the interlayer spacing in crystallite.</jats:p> <jats:p>With the charcoal, so-called three-phase graphitization was observed.</jats:p>

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