Thin film growth of oxide superconductor materials

摘要

Thin films of YBa/sub 2/Cu/sub 3/O/sub 7/, YBa/sub 2/Cu/sub 3/O/sub 7/:Ag and Bi/sub 2/CaSr/sub 2/Cu/sub 2/O/sub 8/ have been grown by spray pyrolysis of aqueous nitrate solutions. Substrate temperatures in the range of 300 degrees C to 875 degrees C have been investigated. Following deposition, the films were annealed in flowing oxygen at 960 degrees C for YBa/sub 2/Cu/sub 3/O/sub 7/ and 850 degrees C for Bi/sub 2/CaSr/sub 2/Cu/sub 2/O/sub 8/. The unit cell size of YBa/sub 2/Cu/sub 3/O/sub 7/:Ag did not change from that of YBa/sub 2/Cu/sub 3/O/sub 7/ but the X-ray diffraction patterns for the YBa/sub 2/Cu/sub 3/O/sub 7/:Ag films show that the