Anisotropic microstrain broadening of minium, Pb₃O₄, in a high-pressure cell: interpretation of line-width parameters in terms of stress variations

The diffraction-line broadening exhibited by three different Pb₃O₄ phases was studied at ambient and elevated pressures. The broadening indicates strongly anisotropic microstrain, which was interpreted in terms of (local) stress variations in association with strongly anisotropic elastic properties.

Notes on the order-of-reflection dependence of microstrain broadening

The reflection-order-dependent increase of the integral breadth of microstrain broadening on the d* scale is investigated. Whereas for negligible local strain gradients `usual', linear increase of the integral breadth occurs, strain gradients can lead to a nonlinear and, for the special case of uncorrelated strains, to a parabolic increase of the integral breadth in association with Lorentzian line shapes.