Abstract
The anisotropic and asymmetric microstrain-like line broadening of hexagonal e-FeNy (y = 0.407) was analysed. It is ascribed to composition fluctuations (local deviations of y) leading to lattice-parameter fluctuations as origin of the line broadening because the extent of the observed anisotropy agrees with values predicted from the concentration de- pendence of the lattice parameters of e-FeNy. Different approaches to parametrise the ani- sotropy of line broadening caused by composition fluctuation for different crystal systems and their advantages and disadvantages are discussed.
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