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in subjects: "Yttrium Compounds 360206* -- Ceramics, Cermets, & Refractories-- Radiation Effects"

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Electron irradiation effects in YBa/sub 2/Cu/sub 3/O/sub 7-delta/ single crystals

Defect structures in YBa/sub 2/Cu/sub 3/O/sub 7/minus/delta/ produced by electron irradiation at 300/degree/K, were investigated by transmission electron microscopy. Threshold energies for the production of visible defects were determined to b 152 keV and 131 keV (+- 7 keV) in directions near the a- and b-axes, respectively (b > a, both perpendicular to c, the long axis in the orthorhombic structure). During above-threshold irradiations in an electron flux of 3 x 10 /sup 18/ cm/sup /minus/2/s/s… more

Date: April 1, 1988

Creator: Kirk, M.A.; Baker, M.C.; Liu, J.Z.; Lam, D.J. & Weber, H.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Critical currents in proton irradiated YBa sub 2 Cu sub 3 O sub 7-. delta. crystals

A large enhancement in the critical current of YBaCuO crystals in magnetic field is observed after irradiation with 3 MeV protons. Critical current densities with values up to 2 {times} 10{sup 5} A/cm{sup 2} at 77 K and 1 T are observed. TEM studies show the presence of isolated clusters of defects after irradiation; however, an analysis of the critical current scaling indicates that these clusters are not the dominant pinning sites. The dose dependence of the current density suggests that the … more

Date: April 1, 1991

Creator: Civale, L.; McElfresh, M. W.; Marwick, A. D.; Worthington, T. K.; Malozemoff, A. P.; Holtzberg, F. et al.