Effect of sintering temperature on TIo.8SCro.i5Sr2CaCu207.5 superconductor synthesized by co-precipitation method. / Rafidah Senin

The Tlo.85Cro.i5Sr2CaCu207.5 superconductor was able synthesized from Tl-free precursor using co-precipitation method. The metal oxalates powders strontium (Sr), calcium (Ca) and copper (Cu) were calcined at 850°C for 20 hours after precipitation method was done. Then, TI2O3 and Cr203 were added to precursor to form a sample. The samples were sintering at 960°C , 980°C and 1000°C for 4 minutes in flowing oxygen. Next, the sample was characterized to determine the critical temperature and microstructure of the samples. The zero-resistance temperature, Tc-zero for sample sintered at 960°C, 980°C and 1000°C for 4 minutes were 88.8K, 90.8K and 92.0K . The •grain size , grain connectivity and microstructure change with the increasing temperature. The average grain size at 960°C was 0.55 ^m , at 980°C was 0.79 \im and at 1000°C was 1.55[xm .Based on this study, it show that when the temperature increased, the critical temperature (7c) and the grain size of all samples also increased linearly follow the increased of the sinteringxtemperature. We can conclude that the sample with higher sintering temperature show better grain connection which leads to better electrical properties.