Physical-mechanical properties of ErBaCuO superconductors doped with gold and gallium

Abstract

Physical-mechanical properties of non-doped ErBCO high temperature superconductor ceramics and doped with Ga and Au has been investigated using the complex method of low frequency internal friction and shear modulus measurements in the temperature range 20-700°C. Near 200°C internal friction relaxation maximum and shear modulus defect were found. It is established that the relaxation proccess is caused by movement of twin boundary, interacted with the oxygen atoms. It was established that activation energy of the relaxation processes is equal to ∼ 0.9eV and the frequency factor to 1012sec-1. Doping by gold and gallium significantly increase internal friction temperature spectrum and thermal stability, activation characteristics of relaxation processes, and values of shear modulus and dislocation elastic limit. © 2008 IOP Publishing Ltd.