Integrated intensity changes of X-ray diffraction lines for crystalline powders by grinding and compression. Relations between effective Debye parameter and lattice strain

Abstract

The relations between the effective Debye parameter and lattice strain are investigated on some non-metallic crystalline powders, CoO, Co0.5 Mg0.5O, CoAl2O4, TiO2, CaF2, BaTiO3 and graphite. The effective Debye parameter B eff was determined from the integrated intensities of X-ray diffraction lines with different sin θ/λ-values and the lattice strain, e, was determined from the half-widths of the diffraction lines. Both B eff and e increased with increase in grinding time and pressure. B eff showed a relatively sharp increase, but tended to saturation. However, e increased slowly even after prolonged grinding, and B eff increased with increase in e. When e>0.2×10−2, however, B eff tended to a limit. The limiting values of B eff were varied from sample to sample. An attempt was made to explain the changes of B eff and e with grinding and compression to large shear by the introduction of various defects into the structure. B eff was found to give some information on the deformed structure of crystalline powders.