Effect of heat-treatment temperatures on density and porosity in MgB2 superconductor

摘要

The density, porosity, and microstructures of MgB2 samples are very important factors for transition critical current density. The effect of heat-treatment temperatures on density and porosity in MgB2 superconductors has been investigated. The open porosity increases with increasing heat-treatment temperatures, but close porosity decreases. The calculated theory densities from the lattice parameters of the measured samples are 2.6-2.63 g/cm(3). The average measured total porosity (including open and close porosity) is about 50%. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 5]