Abstract
The anisotropic expansion and contraction of YBa{sub 2}Cu{sub 3}O{sub 7-x} (YBCO) grains during fabrication could lead to internal stresses that may be relieved by microcracking resulting in low critical currents. Neutron diffraction techniques have been used to examine the internal strain as a function of grain size in samples of YBCO. The full width at half maximum (FWHM) of the Gaussian shaped diffraction peaks are used for the strain analysis. The FWHM in the strain distribution for the coarse grain material is found to be about 0.05%. The strain variation for the fine grained material on the other hand is significantly larger and is about 0.3%. Results of this study suggests the strains are relieved by microcracking in coarse grained YBCO.
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