The stability of superconducting properties of epitaxial Tl2Ba2CaCu2O8
thin films in water has been investigated at room temperature. The me
asurements of T-c, J(c) and XRD theta-2 theta scans proved that the su
perconductivity of the completely crystalline film was very stable in
water at room temperature. If the film is mixed with amorphous inclusi
on of BaO and CaO, it can be corroded in water. If the film is pollute
d by photoresist, silver dag, indium or silver, it is rapidly corroded
in water.