zT

Definitions

noun metrology Symbol for the zeptotesla, an SI unit of magnetic flux density equal to 10−21 teslas.

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The utility of thermoelectric materials is usually measured by what's called a "figure of merit," a unit-less value abbreviated as zT.

Ars Technica
Closer to room temperature 200°C or 473K, the best semiconductors we have turn in a zT of about one.

Ars Technica
To make sense in specialized applications, we'd want a zT above two; the higher above that and/or the cheaper the material, the more use cases become possible.

Ars Technica
The authors simply tried various degrees of oxidation until they had optimized the thermoelectric effect, finding they could get a zT as high as 0.25 at room temperature.

Ars Technica
Based on their calculations, they produced a Pb/Te/Se material that was doped with sodium impurities, and measured its zT as 1.8 at 850K.

Ars Technica
Right now, some of the best materials we know about have a zT of about one, and some of these involve the use of toxic metals.

Ars Technica
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