Faulting in ZnS: analysis by a two-parameter model

Abstract

The two-parameter model of Jagodzinski has been employed to calculate the X-ray scattering from faulted ZnS. The agreement with the observed scattering from single crystals is sufficiently close to establish the need for the two independent parameters to define the one-dimensional disorder. Departure from perfect agreement is attributable to heterogeneity, or non-randomness, of the faulted structure, which is probably a result of the transformation mechanism. Direct evidence of independently diffracting domains has been obtained in a micro-diffraction study of the bands of uniform birefringence which accompany the disorder. Implications from the ZnS findings are made for other cases of one-dimensional disorder. An Appendix provides intermediate equations required for calculating Jagodzinski's function for any combination of a and ft.