Preparation of superconducting films of yttrium barium(2) copper(3) oxygen(7) using the metallo-organic decomposition technique
Abstract
The metallo-organic decomposition or MOD technique was investigated as a method of preparing thin films of the 93 K superconducting compound $\rm YBa\sb2Cu\sb3O\sb{7-\delta}$. Initial work involved the determination of appropriate substrates and diffusion barriers for work with $\rm YBa\sb2Cu\sb3O\sb{7-\delta}$. Subsequent work concentrated on the investigation of the effect of processing variables such as solution concentration, and firing and annealing conditions on film electrical properties and microstructure with the goal of maximizing T$\sb{\rm c}$ and understanding factors limiting the electrical properties of films. It was determined that MgO substrates offered the best combination of thermal coefficient of expansion match with lack of chemical interaction with the films. A gold diffusion barrier was found to marginally improve film electrical properties. Carbon retention in the film was found to be the critical factor limiting film electrical properties. Means of preventing this problem are outlined and the results of the implementation of one method of carbon removal are discussed.
Degree
Ph.D.
Advisors
Vest, Purdue University.
Subject Area
Materials science
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