Reaction kinetics in the superconducting YBa2Cu3O7-x and SmBa2Cu3O7x |
| |
| Affiliation: | 1. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, Krzhizhanovsky St. 3, Kyiv 03142, Ukraine;2. CNR-ISSMC (former ISTEC), National Research Council of Italy, Institute of Science, Technology and Sustainability for Ceramics, Via Granarolo 64, Faenza 48018, Italy;1. School of Physics and Electronics, Central South University, Changsha 410083, China;2. School of Information Science and Engineering, Shaoyang University, Shaoyang 422000, China;1. Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. Key Laboratory of Low-Dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, College of Physics and Electronic Information Engineering, Guilin University of Technology, Guilin 541004, China |
| |
| Abstract: | The compounds under investigation were prepared with nominal composition MBa2 Cu3 O7-x, M being Y or Sm, through solid state reaction starting from Y2O3, Sm2O3, BaCO3 and CuO powders. Reactions were investigated by thermo-gravimetric and differential thermal analysis in the temperature range 900–980°C. Reaction kinetics of MBa2Cu3O7-x solid state synthesis were evaluated according to the mathematical relationships theoretically derived for phenomenological models. In the Y-based system the phase boundary model provides a reaction kinetics suitable to describe the process, while a three dimensional diffusion model fits the data in the Sm-based system. The influence of the mixing method on the reaction kinetics was evaluated. Microstructural features of superconducting samples were analyzed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
