Fully dense MgB₂ superconductor textured by hot deformation

Original · EN

Bulk textured MgB₂ material of nearly full density showing a weak c-axis alignment of the hexagonal MgB₂ grains parallel to the pressure direction was obtained by hot deformation of a stoichiometric MgB₂ pellet prepared by a gas-solid reaction. The texture of the material was verified by comparing the x-ray diffraction patterns of the hot deformed material with isotropic MgB₂ powder. A small, but distinct anisotropy of the upper critical field up to Hc2ᵃ,ᵇ/Hc2ᶜ 1.2 depending on degree of texture was found by resistance and susceptibility measurements. No anisotropy of the critical current density determined from magnetization measurements was found for the textured material.