X-ray Topographic Investigation of Quartz Single Crystals at High Temperature, up to 1185°C

Abstract

Real time experiments were performed to study the structural behaviour of monocrystalline quartz at high temperatures. White beam diffraction topography in transmission geometry was used. A creation of Dauphine-twins took place slightly below the α-β-phase transition temperature. The diffraction contrast of twins and temperature stresses disappeared above the α-β-phase transition temperature. Up to 1185°C neither changes of the defect structure nor a creation of new defects were observed. A precursor for a beginning of a reconstructive phase transition from quartz to cristabolite could not be observed within a time interval of 2h at 1180°C