The effects of alkali impurities on the superconductivity and powder characteristics of YBa2Cu3O7 |
| |
| Affiliation: | 1. School of Civil Engineering, Shandong Jianzhu University, Fengming Road, Lingang Development Zone, Jinan, Shandong 250101, China;2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, 1401 N. Pine Street, Rolla, MO 65409, USA;1. Department of Civil Engineering, IIT, Roorkee 247667, India;2. CBRI, Roorkee 247667, India;1. Department of Civil Engineering, Indian Institute of Technology (ISM) Dhanbad, India;2. Department of Civil and Environmental Engineering, BIT Meshra, India;3. Department of Civil Engineering, BIT Sindri, Dhanbad, India;1. Department of Civil Engineering, Indian Institute of Technology, Roorkee 247667, India;2. Central Building Research Institute, Roorkee 247667, India;3. Dept. of Civil and Environmental Engineering. Yonsei University, Seoul 033722, Republic of Korea;1. Civil Engineering Department, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
| |
| Abstract: | The effects of alkali impurities, Li, Na, K, Rb, and Cs, on the superconducting properties and powder characteristics of YBa2Cu3O7 were investigated. The superconducting temperature of YBa2Cu3O7 drops to the 70 K range in the presence of Li (0.2 mole Li/mole 1-2-3 oxide), while samples containing Rb, K, or Cs show little superconductivity deterioration. An intermediate effect between these two extremes was found for Na. The powder characteristics, inlcuding aggregate hardness, particle size, and particle morphology, of YBa2Cu3O7 are also affected by the alkali impurities. In particular, during calcination both Li and Na enhance the intergrain bonding, resulting in increased difficulty in power comminution, while K and particularly Rb have the opposite effect. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
