Diffraction Absorption in a Quartz Single Crystal in the Presence of a Temperature Gradient

Abstract

The influence of a temperature gradient on anomalous absorption (Bormann effect) in quartz crystals observed in Bragg diffraction in Laue geometry in dynamic diffraction of X-rays for Lauе geometry when the orientations of the diffraction vectors and the temperature gradient (g ↑↑ B) are parallel is experimentally investigated. The study was carried out for various values of µt ~ 0.5 (weak absorption) to 4 (strong absorption), where µ is the linear absorption coefficient, and t is the crystal’s thickness. In this range of crystal thicknesses, the role of abnormal absorption in forming the diffraction field in the deformed crystal lattice and outside the crystal in the recording plane was studied using a specially designed scheme for the experimental setup. Interpretations of the observed features were given based on the dynamic diffraction theory of X-rays in deformed crystal lattices.