Preparation and characterization of electrochemically-deposited superconducting YBa2Cu3O7-8 films

Date of Publication

2005

Document Type

Master's Thesis

Degree Name

Master of Science in Physics

College

College of Science

Department/Unit

Physics

Thesis Adviser

Reuben V. Quiroga

Defense Panel Chair

Lydia S. Roleda

Defense Panel Member

Romeric F. Pobre
Ivan B. Culaba

Abstract/Summary

YBa2Cu3O7-δ(YBCO) films were prepared via electrochemical deposition method followed by a high-temperature sintering in air and a low-temperature annealing in oxygen. Nitrate salts of yttrium, barium, and copper were used as precursors, which were dissolved indimethyl sulfoxide(DMSO). Smooth deposits were obtained at a potentiostatic voltage of –3.5 V (vs. Ag/Ag+) in 30 minutes of deposition. Optimum sintering and annealing conditions were found to be 900°C for 24 hours and 450°C for 24 hours. Two different electrolyte solutions produced films of 1:2:3 stoichiometry with distinct morphologies and superconducting at the optimized annealing conditions. A transition temperature of 100K was obtained for samples prepared from solution with electrolyte composition of Y(NO3)3 6H2O = 20mM, Ba(NO3)2 = 36mM, Cu(NO3)23H2O = 44mM and a 94-K transition temperature was observed for samples prepared from electrolyte solution of Y(NO3)3 6H2O = 20mM, Ba(NO3)2 = 15mM, Cu(NO3)23H2O = 50mM. X-Ray Diffraction (XRD) analysis indicated polycrystalline YBCO films. Scanning Electron Microscopy (SEM) showed better grain size and inter-grain connectivity for films heat-treated at the optimum conditions.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG004013

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Superconductivity; Semiconductor films; Electronics--Materials; Thin films

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