Diamagnetic susceptibility and linear thermal expansion of graphitized carbons
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It is shown that there exists a relationship between the anisotropy coefficients of the diamagnetic susceptibility and the linear thermal expansion of graphitized carbons.
It has been found that the anisotropy coefficient of the diamagnetic susceptibility yields an indication on the growth of crystallographic texture in the material, this growth being determined mainly by the development of structuration in the powder components.
It has been found that the highest degree of structural isotropy in graphitized carbons prepared from oil cokes is attained when the cokes have been fired at temperatures corresponding to minimum Kχ The minimum of Kχ is found at firing temperatures of 600–700°C because at these temperatures the concentration of unpaired electron spins (and, hence, the concentration of free radicals) is lowest.
It has been shown how the binder content affects the magnetic susceptibility and the linear thermal expansion of graphitized carbons.
KeywordsAnisotropy Free Radical Thermal Expansion Magnetic Susceptibility Isotropy
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