Degradation of MgB/sub 2/ thin films in water

We have studied the degradation of MgB/sub 2/ thin films, grown by hybrid physical-chemical vapor deposition (HPCVD), by submerging MgB/sub 2/ films into de-ionized water at different temperatures. The thickness, room temperature resistance, and superconducting transition were measured as a function...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.224-227
Main Authors: Cui, Y., Jones, J.E., Beckley, A., Donovan, R., Lishego, D., Maertz, E., Pogrebnyakov, A.V., Orgiani, P., Redwing, J.M., Xi, X.X.
Format: Article
Language:English
Subjects:
Chemical vapor deposition
Degradation
Electrical resistance measurement
magnesium diboride
Sputtering
Superconducting films
Superconducting materials
Superconducting thin films
Superconducting transition temperature
Thickness measurement
thin films
Time measurement
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Summary:We have studied the degradation of MgB/sub 2/ thin films, grown by hybrid physical-chemical vapor deposition (HPCVD), by submerging MgB/sub 2/ films into de-ionized water at different temperatures. The thickness, room temperature resistance, and superconducting transition were measured as a function of time in water and the temperature of the water. Results show that the films degrade faster at room temperature than at 0/spl deg/C. The room temperature resistance increases with time. The thickness of the MgB/sub 2/ films decreases rapidly initially, but then saturates. The resultant material is amorphous and insulating. Both T/sub c/(onset) and T/sub c/(0) of the MgB/sub 2/ films decrease with time in water, while the superconducting transition become broader. The effects of the exposure to other solvents and photoresist were also studied, and it was found that isopropanol does not cause MgB/sub 2/ films to degrade.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.849763