(Bi2212) is one of the most promising high temperature superconductors for use
in power applications such as generators and fusion reactors. However, the
present technology used for the manufacture of long wires involves a large proportion
of silver, which makes the cost of such wires prohibitive for large scale
exploitation. We explore alternative ways of making Bi2212 wires in the form of
multilayer thin film stacks on top of long, flexible non-noble metal
substrates. For this purpose, we recently developed a chemical solution
deposition technique, which could be used for cheap deposition of Bi2212 films
on long substrates in a reel-to-reel setup. Unfortunately, the solvent presents
safety issues. It is therefore important to develop alternative routes making
use of a harmless solvent, ideally a water based solution.
The aim of
this project is to test green chemistry approaches for the manufacture of
Bi2212 thin films. This work will involve a thorough characterization of the
transformation from the homogeneous solution to the final Bi2212 film, extended
characterization of the microstructure and physical properties of the films and
an analysis of the relationships between processing parameters and film performance.
During this project you are going to:
green-chemistry process and use it to synthesize Bi2Sr2CaCu2O8
high temperature superconducting films on various substrates.
decomposition process of your solution and the reaction leading to the
formation of the superconducting layer.
microstructural characterization of your samples by means of X-ray diffraction,
optical and electron microscopy.
magnetization measurements at cryogenic temperatures under magnetic field to
evaluate the superconducting performance of your samples.
experimental results using state of the art theoretical models.
At the end of
this project you will be able to:
experimental characterization tools (X-ray diffraction, thermal analysis, infrared
spectroscopy, electron microscopy, low temperature magnetization measurements)
and explain their basic principles as well as limitations.
evaluate your results.
between microstructure and performance.
efficient literature search and compare your own results to published data.
results to a scientific audience under conditions equivalent to an international
draft of a scientific publication.