Dynamic effects in X-ray diffraction for quasi-forbidden reflections in binary crystals with strongly distinguished atomic form factors of components

Possibility of the pendulum oscillation observation was shown for quasi-forbidden reflections (QFRs) when using continuous nonpolarized Bremsstrahlung in GaP crystals characterized by large difference of the atomic form factors of components. Sensitivity of the pendulum oscillations of an intensity for the QFRs to deviation of chemical composition in GaP crystals was shown to be more weak as comparing with GaAs samples but it is perhaps enough for a structure changes control in the GaP sublattices due to substitution of their points by heavy atoms. Utilization of asymmetrical reflections in the experiments with QFRs permits to decrease a period of oscillations what can result in growth of their numbers in a given thickness interval. This circumstance may increase the accuracy of the adjustment procedures for crystal reflectivity by comparing of the theoretical calculations results with experimental ones