2 superconductivity and crystalline defects.
Ceramic superconductors price.
Mgb 2 costs a few euros per metre versus tens of euros for ceramic.
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Mgb 2 needs to be chilled below that of a ceramic superconductor which costs more.
The first high temperature superconductor was discovered in 1986 by ibm researchers bednorz and müller 3 6 who were awarded the nobel prize in physics in 1987 for their important break through in the discovery of superconductivity in ceramic materials.
The high temperature superconductors are ceramic materials with layers of copper oxide spaced by layers containing barium and other atoms.
The yttrium compound is somewhat unique in that it has a regular crystal structure while the lanthanum version is classified as a solid solution.
Superconductors are classified as type i or type ii.
Most pure elemental superconductors are type i whereas most alloy conventional superconductors and all high t c ceramic superconductors are type ii.
From a cost and fabrication standpoint an industrially scalable low cost process is requiredwith the goal being to meet or beat the price of copper wire.
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Humphreys in concise encyclopedia of advanced ceramic materials 1991.
It turns out that from a technical or performance standpoint a long flexible single crystal like wire of the highly brittle ceramic superconductor is required.
The yttrium compound is often called the 1 2 3 superconductor because of the ratios of its constituents.
Metonboss superconductor laser engraved titanium spinning top made with aerospace grade 5 titanium heat colored purple.
The superconductors of technological interest are type ii.
Many ceramic superconductors physically behave as superconductors of the second type.