Two step synthesis of TlBa2Ca2Cu3Ox films on Ag substrates by spray pyrolysis of metal-acetylacetonates
A two-step synthesis process was performed to obtain TlBa2Ca2Cu3Ox (Tl-1223) superconductor films. The synthesized films were obtained under different thallium diffusion conditions in a two-zone furnace precursor films were deposited at 550° C on silver substrates using the spray pyrolysis technique from acetylacetonates (2, 4-pentanedionates) as reagents. Second, a thallium diffusion process is carried out to incorporate Tl in the films. For this task Tl2O3 pellets, as a Tl source, were used at 750°C. Different oxygen flow rates at atmospheric pressure were used in order to get the thallous oxide p (Tl2O) partial pressure in the range of 6.9 x 10-4 to 6.1 x 10-2 atm. The Tl-1223 phase was obtained in all cases, though for a low p (Tl2O), the films presented the BaCuO2 phase mixed with the Tl-1223 one. Critical temperature (T C) values for these films were in the range of 90 to 102 K.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Mexicana de Física
2008
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0035-001X2008000600007 |
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