Ag-doped 120 K YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> superconductors prepared by the flame-quench-melt-growth (FQMG) method
E Yanmaz; I H Mutlu; T Kucukomeroglu; M Altunbas; E Yanmaz; Dept. of Phys., Karadeniz Tech. Univ., Trabzon, Turkey; I H Mutlu; Dept. of Phys., Karadeniz Tech. Univ., Trabzon, Turkey; T Kucukomeroglu; Dept. of Phys., Karadeniz Tech. Univ., Trabzon, Turkey; M Altunbas; Dept. of Phys., Karadeniz Tech. Univ., Trabzon, Turkey
Журнал:
Superconductor Science and Technology
Дата:
1994-12-01
Аннотация:
The effect of Ag-doping on the microstructure and physical properties of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> superconductors prepared by a flame-quench-melt-growth (FQMG) process, was investigated. Pellets of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> containing 0-30 weight percentage (wt.%) of Ag were quenched by LPG-O<sub>2</sub> flame melting and then crushed to obtain powder which was compacted and then subjected to a melt-growth process. As a result of this process, large grained, textured YBCO material was produced. It was found that YBCO samples with 10 wt.% Ag doped showed a transition temperature of 120 K and further increasing the Ag content caused a decrease of transition temperature. Using this modified quench-melt-growth technique, the reaction between crucibles and material can be completely avoided during the preparation of the precursor materials.
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