This

device is a zirconia type oxygen sensor which uses oxygen conductor ceramics (YSZ).

If the gas by which oxygen partial pressure differs in what printed the platinum electrode on inside-and-outside both sides of the yttria fully-stabilized-zirconia pipe is passed on both sides, the electromotive force which is proportional to the logarithm of an oxygen-partial-pressure ratio according to Nernst's formula will arise. Speed of response is quick and it can measure with sufficient accuracy.

・Superconducticity substance : development of a new high-temperature superconductivity substance
・Ion conductivity thing : development of a fuel cell (SOFC), etc.
・Oxide semiconductor : development of a solar cell device, etc.
・Mixed oxide fuel : safety research of nuclear fuel, etc.