Texture Investigations on High Temperature Superconductors
1995
The formation of a structure with strong crystallographic texture is an important requirement for high
critical current densities at 77 K in high temperature superconductive materials (HTSC). In this work
several methods for texture investigation in the superconductive phase of BiPbSrCaCuO/Ag- and
YBaCuO/AgPd-composite conductors prepared according to the “powder in tube”-method as well as
in YBaCuO-thick layers are presented. For the characterisation of the texture development in dependence
on technological steps at the preparation of HTSC-composite conductors the determination of the halfwidth
FWHM from the psi-scan or for one-phase specimens the determination of the Lotgering-factor
is appropriate, if only a c-axis exists. The measurement of pole figures is necessary to determine, whether
a rotation symmetry occurs or an orientation of the (a,b)-directions exists. The use of the omega-scan
to determine the half-width is not useful, if the goniometer unit is intended and optimised for phase
analysis and therefore the secondary monochromator cannot be relinquished.
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