X-ray diffraction study of crystallite size-distribution and strain in carbon blacks

Ungár, Tamás and Gubicza, Jenő and Ribárik, Gábor and Zerda, T. W. (2000) X-ray diffraction study of crystallite size-distribution and strain in carbon blacks. In: Materials Research Society Symposium, 2000. november 27 - december 1., Boston, Amerikai Egyesült Államok.

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Abstract

The crystallite size and size-distribution in the presence of strain is determined in carbon blacks by a recently developed procedure of X-ray diffraction peak profile analysis. The Fourier coefficients of the measured physical profiles are fitted by Fourier coefficients of well established ab initio functions of size and strain peak profiles. Strain anisotropy is accounted for by the dislocation model of the mean square strain in terms of average dislocation contrast factors. Crystallite shape anisotropy is modelled by ellipsoids incorporated into the size profile function. The Fourier transforme of the size profile is given as an explicite formula making the fitting procedure fast. The method is applied to carbon balcks terated at different preassures and temperatures. The microstructure is characterised in terms of crystallite size-distribution, dislocation density and crystallite shape anisotropy.

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