The effect of sintering temperature on the formation of (Tl, Cr)-1212 superconducting ceramic from coprecipitated oxalate precursors

• Main Authors: Hamadneh, Imad (Moh'd Khair) Rashid, Lee, Teik Hui, Abd Shukor, Roslan
• Format: Conference or Workshop Item
• Language: English
• Published: American Institute of Physics 2006
• Online Access: http://psasir.upm.edu.my/id/eprint/57358/1/The%20effect%20of%20sintering%20temperature%20on%20the%20formation%20of%20%28Tl%2C%20Cr%29-1212%20superconducting%20ceramic%20from%20coprecipitated%20oxalate%20precursors.pdf; http://psasir.upm.edu.my/id/eprint/57358/

TlSr1212 superconductors were synthesized by solid‐state reaction using Tl‐containing precursor powder prepared by coprecipitation of metal acetates with stoichiometric ratio based on Tl0.85Cr0.15Sr2CaCu2O7−δ composition. The samples were sintered at temperatures between 960 and 980°C for duration of 5 minutes. XRD patterns for samples sintered at 960°C showed formation of dominant 1212 phase in addition to minor 1201 phase and SrCO3 impurity. At this sintering temperature, the best superconducting behavior with TC(R=0) of 100 K was observed for the sample sintered at 970°C. SEM investigations on the sample revealed elongated grains which belong to 1212 phase with a slight directional grain alignment. The sample with sintering temperature of 960°C showed better grains connection as compared to the rest of the samples.