Title :
Degradation of MgB2 thin films in water
Author :
Cui, Y. ; Jones, J.E. ; Beckley, A. ; Donovan, R. ; Lishego, D. ; Maertz, E. ; Pogrebnyakov, A.V. ; Orgiani, P. ; Redwing, J.M. ; Xi, X.X.
Author_Institution :
Dept. of Phys., Pennsylvania State Univ., University Park, PA, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
We have studied the degradation of MgB2 thin films, grown by hybrid physical-chemical vapor deposition (HPCVD), by submerging MgB2 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°C. The room temperature resistance increases with time. The thickness of the MgB2 films decreases rapidly initially, but then saturates. The resultant material is amorphous and insulating. Both Tc(onset) and Tc(0) of the MgB2 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 MgB2 films to degrade.
Keywords :
CVD coatings; magnesium compounds; solvent effects; superconducting epitaxial layers; superconducting transition temperature; superconducting transitions; type II superconductors; water; H2O; MgB2; MgB2 thin film degradation; amorphous materials; deionized water; hybrid physical-chemical vapor deposition; insulating materials; magnesium diboride; photoresist; room temperature resistance; solvents; superconducting transition; Chemical vapor deposition; Degradation; Electrical resistance measurement; Sputtering; Superconducting films; Superconducting materials; Superconducting thin films; Superconducting transition temperature; Thickness measurement; Time measurement; Degradation; magnesium diboride; thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.849763
