Abstract
In this study, high purity and fine-grained Tl1212 superconductor samples were successfully synthesized from Tl0.8Bi0.2Sr2Ca0.8Y0.2Cu2O7 starting composition by a two-step solid-state reaction method using Tl-free precursor powder prepared from coprecipitation method. XRD pattern of the sample, which was sintered at 1,000 °C for 6 min essentially showed formation of high purity 1212 phase. The sample’s zero resistance critical temperature, T c zero was 91 K and bulk critical current density, J c measured at 40 K in zero magnetic field was 11.2 A/cm2. SEM investigation on the sample revealed ultrafine homogeneous grains that are randomly orientated with grain sizes of approximately 0.5–1 μm. Resintering the sample did not affect its superconducting properties but induced clustering of grains as observed by SEM. It is suggested that the sample be used in specialized measurement techniques such as in ultrasonic studies where high purity and ultrafine-grained samples are required.
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