Thermoelectric materials and methods of making thermoelectric materials having a nanometer mean grain size less than 1 micron. The method includes combining and arc melting constituent elements of the thermoelectric material to form a liquid alloy of the thermoelectric material and casting the liquid alloy of the thermoelectric material to form a solid casting of the thermoelectric material. The method also includes ball milling the solid casting of the thermoelectric material into nanometer mean size particles and sintering the nanometer size particles to form the thermoelectric material having nanometer scale mean grain size.
This invention was made with government support under grant number DOE DE-FG02-00ER45805 awarded by US Department of Energy, under grant number DE-SC0001299 awarded by the U.S. Department of Energy, and under grant number DE-EE0004840 awarded by the U.S. Department of Energy. The government has certain rights in the invention.