Phase Transition in Superconducting Thin Films of Tl System Employing a One-Zone Furnace and Deposited by Spray Pyrolysis — Oak Academic Publishing
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Phase Transition in Superconducting Thin Films of Tl System Employing a One-Zone Furnace and Deposited by Spray Pyrolysis
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México; Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, México D.F., México
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Unidad Académica de Física, Universidad Autónoma de Zacatecas (UAZ), Zacatecas, México
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Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
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Departamento de Física, Centro de Investigación de Estudios Avanzados (CINVESTAV-IPN), México D.F., México
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Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
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Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
1 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México; Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, México D.F., México
2 Unidad Académica de Física, Universidad Autónoma de Zacatecas (UAZ), Zacatecas, México
3 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
4 Departamento de Física, Centro de Investigación de Estudios Avanzados (CINVESTAV-IPN), México D.F., México
5 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
6 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D.F., México
A study of the phase transitions in superconducting thin films of the Thallium-Barium-Calcium-Copper (TBCCO) sys tem is carried out. In particular, it was got the Tl-1223 phase. For this purpose, and using the ultrasonic spray pyrolysis technique, Barium-Calcium-Copper precursor films were first obtained. Upon deposition of the precursor films, and as a second step, they were thallium (Tl) diffused in the one-zone furnace at 860° C . This methodology resulted in super conducting films that showed a phase transition as follows: Tl-2223 → Tl-2223 + Tl-2212 → Tl-2212 → Tl-1223, achieved between 2 and 7 hours of thallium diffusion. The evidence of the phase transitions was corroborated by the experimental results of X-ray diffraction, energy dispersive spectroscopy and resistance-temperature measurements.
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