Title :
Bulk YBa/sub 2/Cu/sub 3/O/sub 7-x/-Ag superconductor via synthesized precursor containing BaCuO/sub 2.5/
Author :
Sinha, S.N. ; Lee, H.G.
Author_Institution :
Illinois Univ., Chicago, IL, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
An intermediate precursor containing 0.5Y/sub 2/O/sub 3/+2BaCuO/sub 2.5/+CuO+0.325 Ag is synthesized. By attrition milling of metals and barium nitrate and subsequent controlled heat treatment the precursor was obtained. To prepare orthorhombic YBa/sub 2/Cu/sub 3/O/sub 7-x/-0.325 Ag superconductor, the silver tubes packed with the precursor was heat treated for 40 min at 950 degrees C in air and subsequently either quenched or cooled slowly in air at 100 degrees C/h. If the sample was heat treated for 30 min or less at 950 degrees C in air and quenched, tetragonal YBa/sub 2/Cu/sub 3/O/sub z/ formed.<>
Keywords :
X-ray diffraction examination of materials; barium compounds; ceramics; high-temperature superconductors; powder technology; quenching (thermal); silicon; yttrium compounds; 30 min; 40 min; 950 degC; HTSC; XRD; YBa/sub 2/Cu/sub 3/O/sub 7-x/-Ag superconductor; attrition milling; controlled heat treatment; powder; quenching; Argon; Barium; Heat treatment; Mechanical factors; Milling; Powders; Silver; Superconducting devices; Thermomechanical processes; X-ray scattering;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
