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University of Houston System

U.S. Department of Energy

Giri Joshi

Zhifeng Ren

Boris Kozinsky

Gang Paul Chen

Shuo Chen

Bed Poudel

James Christopher Caylor

Xiao Yan

Ran He

Jian Yang

Martin Cleary

Michael Engber

Tej Pantha

A thermoelectric half-Heusler material comprising niobium (Nb), iron (Fe) and antimony (Sb) wherein the material comprises grains having a mean grain size less than one micron. A method of making a nanocomposite half-Heusler thermoelectric material includes melting constituent elements of the thermoelectric material to form an alloy of the thermoelectric material, comminuting (e.g., ball milling) the alloy of the thermoelectric material into nanometer scale mean size particles, and consolidating the nanometer size particles to form the half-Heusler thermoelectric material comprising at least niobium (Nb), iron (Fe) and antimony (Sb) and having grains with a mean grain size less than one micron.

NbFeSb based half-heusler thermoelectric materials and methods of fabrication and use

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.

Half-heusler alloys with enhanced figure of merit and methods of making

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Maynard, MA, United States of America

Giri Joshi