Using helium as background gas to avoid hydrogen brittleness for MgB2 film fabrication on niobium substrate by HPCVD
| Autor: | Zhimao Ni, Can Yang, Lizhi Chen, Hui Hu, Qingrong Feng, Xin Guo, Kexin Liu |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Fabrication Argon Hydrogen Niobium Energy Engineering and Power Technology chemistry.chemical_element Substrate (electronics) Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry 0103 physical sciences Magnesium diboride Electrical and Electronic Engineering Composite material 010306 general physics Helium |
| Zdroj: | Physica C: Superconductivity and its Applications. 524:13-17 |
| ISSN: | 0921-4534 |
| Popis: | Magnesium diboride has shown potential as an alternative material for the application of superconducting RF cavities. However, if MgB 2 films are fabricated on niobium substrates with HPCVD method, hydrogen brittleness will cause cracks on MgB 2 film when it is bent. In this work, we have investigated the possibility of depositing MgB 2 film on niobium in other background gases rather than hydrogen to avoid hydrogen brittleness. Though MgB 2 films fabricated in nitrogen and argon have impurities and show poor superconducting properties, the MgB 2 film fabricated in helium has similar morphology and superconducting properties of that prepared in hydrogen and no cracks are observed after bending. The problem of hydrogen brittleness can be solved by using helium as the background gas when fabricating MgB 2 films on niobium substrates. |
| Databáze: | OpenAIRE |
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