DTA-TG Analysis of Gd0.95La0.05Ba1.95Sr0.05Cu3Oy Compounds

Abstract

Abstrak -The sintering temperature is played a vital role in the evolution of phase structure, microstructure, and the properties of the superconductor. In this study, the Gd0.9La0.1Ba1.95Sr0.05Cu3O7- phase compound has been synthesized by the wet method using HNO3 as a solvent. The samples were divided into two groups. The first sample was calcined at 400 °C for 2 hours + 500 °C for 2 hours + 600 °C for 6 hours. The second sample treated by the same process and then continued by heating at 900 °C for 15 minutes. The effect of the calcination temperature for the synthesis of Gd0.9La0.1Ba1.95Sr0.05Cu3O7- bulks was investigated using the DTA-TG method. The results showed that the optimum reaction temperature for the formation of Gd0.9La0.1Ba1.95Sr0.05Cu3O7- phase was 938 °C. The additional heating temperature e.g. 900 °C for 15 minutes on the calcination process can reduce the optimum formation temperature of by 20 °C. The peritectic melting reaction temperatures of the sample without the addition of heating and with the addition of heating at temperature 900 °C for 15 minutes are 1032°C and 1035°C, respectively. The melting temperatures of both samples are 1164 °C and 1200 °C.

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

“…Orthorhombicity was determined using the equation, r = 100 (b -a) / (b + a). La358 superconductor shows a lower orthorhombicity value due to the La 3+ cations generate a decrease of oxygen concentration in the O(1) site, located in the basal plane along axis b 14,28 . The samples with greater superconducting phase showed a higher T c , which was influenced by the synthesis method used and the synthesis conditions.…”