Phase Transition in Superconducting Thin Films of Tl System Employing a One-Zone Furnace and Deposited by Spray Pyrolysis
Phase Transition in Superconducting Thin Films of Tl System Employing a One-Zone Furnace and Deposited by Spray Pyrolysis作者机构：Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Instituto Politécnico Nacional México D.F. México 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 Departamento de Física Centro de Investigación de Estudios Avanzados (CINVESTAV-IPN) México D.F. México Unidad Académica de Física Universidad Autónoma de Zacatecas (UAZ) Zacatecas México
出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)
年 卷 期：2013年第4卷第11期
页 面：739-745页
主 题：Superconductors Thin Films Ultrasonic Spray Pyrolysis
摘 要：A study of the phase transitions in superconducting thin films of the Thallium-Barium-Calcium-Copper (TBCCO) system 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 superconducting 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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