Role of double doping with C and RE 2 O 3 oxides on the critical temperature and critical current of MgB 2 phase
| Autor: | Andrzej Morawski, G. Gajda, P. Przyslupski, Md. Shahriar A. Hossain, T. Cetner, R. Diduszko, Daniel Gajda, Konrad Gruszka |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Diffraction
Materials science Condensed matter physics Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Magnetization chemistry Mechanics of Materials Hot isostatic pressing Phase (matter) 0103 physical sciences Materials Chemistry Diamagnetism 010306 general physics 0210 nano-technology Boron |
| Zdroj: | Journal of Alloys and Compounds. 709:473-480 |
| ISSN: | 0925-8388 |
| Popis: | A series of MgB2 samples doped with C, RE2O3 oxides (RE = Ce, Nd), and C and RE2O3oxides was prepared by the hot isostatic pressing method at high pressure: 1 GPa under argon gas. Based on X-ray diffraction and magnetization measurements it was found that the RE2O3 is not incorporated into MgB2. A secondary REB4 phase is present after the synthesis. No decrease in the critical temperature (Tc) is observed after the RE2O3 doping. The Tc of C and RE2O3 doped MgB2 is decreased by 3 K. The doping decreases the diamagnetic response in comparison to pure MgB2 phase. The highest critical current density (Jc) was 3.4 × 105 A/cm2 at 4.2 K and 0.5 T for the bulk material, and the irreversibility field for the Nd2O3 doped sample was located at high field at T = 30 K. The results indicate that inside grains of pinning centers increase Jc from 4.2 K to 25 K and decrease Jc at 30 K. On the other hand, pinning centers between grains (precipitate) increase Jc at 30 K and decrease Jc from 4.2 K to 25 K in the middle and high magnetic fields. Our research shows that carbon-encapsulated boron creates a point pinning centers. |
| Databáze: | OpenAIRE |
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