Synthesis and Characterization of MgB2 Thin Films Prepared by 2.4 Mhz Ultrasonic Spray Pyrolysis System

• Published in: Journal of superconductivity and novel magnetism 2011-01, Vol.24 (1-2), p.529-534
• Main Authors: Yakinci, Z. D., Aydoğdu, Y.
• Format: Article
• Language: English
• Subjects: Borides; Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Deposition; Effects of material synthesis, crystal structure, and chemical composition; Exact sciences and technology; Heating; High-tc films; Magnesium compounds; Magnetic Materials; Magnetic properties; Magnetism; Nanostructure; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconducting films and low-dimensional structures; Superconductivity; Superconductors; Thin films; Transition temperature variations
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-010-0986-3

Nano-sized B and Mg powders have been successfully deposited onto single crystal MgO(100) and Al 2 O 3 (001) substrates using 2.4 MHz ultrasonic spray pyrolysis system and an appropriate solution to obtain thin films of MgB 2 superconductors. After an in-situ heating process, ∼600–1000 nm thick superconductor films were obtained. The microstructure, electrical, and magnetic properties were characterized by means of particle size analyzer, XRD, SEM–EDX, R – T , and M – H analysis. The effect of particle concentration in the solution, spraying time, and heating temperature on the quality of the MgB 2 films were discussed. The best T c and T zero results were obtained to be 39.5 and 37.4 K, respectively, for the film deposited on the Al 2 O 3 (001) substrates. Magnetic properties of the MgB 2 films were investigated at 3 different temperatures and up to 5 T. Symmetric hysteresis loops for all temperature and field cases were obtained and maximum value was calculated to be 4.0×10 6  A cm −2 at 10 K for 0 T for the film deposited on the Al 2 O 3 (001) substrates. The results obtained were found to be highly dependant on the particle concentration in the solution, heating temperature of substrates and carrier gas flow rate during spraying.