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Why does the brittleness of ceramic superconductors limit their applications?

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Figure 1: Schematic diagram of a zirconia oxygen sensor used to monitor automobile exhaust gases. The sensor, approximately the size of a spark plug, is fitted into the exhaust manifold of an automobile engine. The thimble-shaped zirconia sensor, sandwiched between thin layers of porous platinum, is exposed on its interior to outside air and on its exterior to exhaust gas passing through slits in the sensor shield. The two platinum surfaces serve as electrodes, conducting a voltage across the zirconia that varies according to the difference in oxygen content between the exhaust gas and the outside air.
conductive ceramics Figure 1: Schematic diagram of a zirconia oxygen sensor used to monitor automobile exhaust gases. The sensor, approximately the size of a spark plug, is fitted into the exhaust manifold of an automobile engine. The thimble-shaped zirconia sensor, sandwiched between thin layers of porous platinum, is exposed on its interior to outside air and on its exterior to exhaust gas passing through slits in the sensor shield. The two platinum surfaces serve as electrodes, conducting a voltage across the zirconia that varies according to the difference in oxygen content between the exhaust gas and the outside air.

The brittleness of ceramic superconductors is a significant barrier to their widespread adoption because it complicates the manufacturing and processing of these materials into functional forms, such as wires for electric power transmission or coils for magnets. Unlike metal alloy superconductors, which are ductile and can be easily shaped, ceramic superconductors are notoriously fragile.12

This inherent brittleness limits their practical application in several ways:

  • Processing Difficulties: Because they cannot be easily drawn into wires or shaped like metals, creating complex components for devices like magnetic resonance imaging (MRI) machines or high-speed levitated trains is technically challenging.12
  • Structural Integrity: Their tendency to fracture under stress makes them susceptible to damage during the assembly and operation of high-performance equipment.13
  • Performance Interference: In addition to physical brittleness, these materials often suffer from a tendency for impurities to segregate at grain boundaries. This can interfere with the flow of high currents in the superconducting state, further limiting their utility in demanding electrical applications.2

Engineers continue to research ways to overcome these limitations to fully leverage the potential of high-temperature superconductors.23