Question is stated as above. It's well established that certain materials such as tungsten, when heated, produce electrons. Curious to know if there are materials that happen to produce anti-electrons (positrons) in a similar fashion.
obvious (though impractical): an anti-metal, e.g. anti-tungsten :-)
slightly more practical: there are many positron-emitting radioactive nuclides, e.g. 18F, 22Na, 26Al... But it will be surprising if you'll find a measurable temperature dependence of the emission rate.
Roughly speaking materials with a high nuclear charge Z have short radiation lengths, while low Z materials have a long radiation length. Conventional positron sources require targets of 4-6 radiation length, while positron sources based on direct photon conversion require targets of only 0.4-0.5 radiation length.
This was taken from the following source:
https://accelconf.web.cern.ch/e04/PAPERS/TUZACH01.PDF
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