Fully dense MgB2 superconductor textured by hot deformation
Abstract
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.
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