Journal of Materials Science and Chemical Engineering, 2020, 8, 44-53 https://www.scirp.org/journal/msce ISSN Online: 2327-6053 ISSN Print: 2327-6045 DOI: 10.4236/msce.2020.81005 Jan. 13, 2020 44 Journal of Materials Science and Chemical Engineering Effect of Substitution Sr Cations on the Structure in the Gd 1 (Ba 2−x Sr x )Cu 3 O 7−δ Phases Made Sumadiyasa , Nyoman Wendri , Putu Suardana, Ni Nyoman Rupiasih Department of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Badung, Indonesia Abstract In an effort to improve the performance of superconductors in the field and high temperatures it is important to study the superconducting mechanism. For this reason, the cation substitution can be conducted. One of the high Tc superconductors Gd 1 Ba 2 Cu 3 O 7−δ phase with Sr substitution has been synthesized, i.e. Gd 1 (Ba 2−x Sr x )Cu 3 O 7−δ compound. The sample was synthe- sized by using a solid-state reaction method with a wet mixing, sintered for 12 hours at temperature 900˚C. The synthesis results are characterized by using XRD. The results of Match-3 software analysis showed high (higher 85%) Gd 1 Ba 2 Cu 3 O 7−δ phase was formed. The Sr substitution causes changes to the structure, i.e. the lattice parameters a, b and c, where the orthorhombicity tends to decrease with increasing Sr content. Refinement results show that based on the oxygen occupancy, the total oxygen content tends to increase. Keywords Wet Mixing, Gd 1 (Ba 2−x Sr x )Cu 3 O 7−δ Compound, Sr Substitution, Lattice Parameters, Orthorhombicity 1. Introduction One of the superconducting materials with high critical temperatures that have been successfully discovered is the Gd 1 Ba 2 Cu 3 O 7−δ (GBCO-123 system) with a critical temperature of 94 K by Yamaguchi, 2014 [1] so it is very possible to be utilized with liquid nitrogen cooling. However, the GBCO-123 superconductor has Tc and Jc which are still strongly influenced by magnetic fields [2]. There- fore, research is still needed to improve the performance of the superconductor in high temperatures and high magnetic fields. In this research substitution of Ba was carried out, i.e. Sr in the Gd 1 Ba 2 Cu 3 O 7−δ superconductor system with the chemical formula Gd 1 (Ba 2−x Sr x )Cu 3 O 7−δ . The se- How to cite this paper: Sumadiyasa, M., Wendri, N., Suardana, P. and Rupiasih, N.N. (2020) Effect of Substitution Sr Cations on the Structure in the Gd 1 (Ba 2−x Sr x )Cu 3 O 7−δ Phases. Journal of Materials Science and Chemical Engineering, 8, 44-53. https://doi.org/10.4236/msce.2020.81005 Received: November 6, 2019 Accepted: January 10, 2020 Published: January 13, 2020 Copyright © 2020 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution-NonCommercial International License (CC BY-NC 4.0). http://creativecommons.org/licenses/by-nc/4.0/ Open Access