A simple model for vacancy order and disorder in defective half-Heusler systems.

ABSTRACT: Defective half-Heusler systems X _1-x YZ with large amounts of intrinsic vacancies, such as Nb_1-x CoSb, Ti_1-x NiSb and V_1-x CoSb, are a group of promising thermoelectric materials. Even with high vacancy concentrations they maintain the average half-Heusler crystal structure. These systems show high electrical conductivity but low thermal conductivity arising from an ordered YZ substructure, which conducts electrons, while the large amounts of vacancies in the X substructure effectively scatters phonons. Using electron scattering, it was recently observed that, in addition to Bragg diffraction from the average cubic half-Heusler structure, some of these samples show broad diffuse scattering i

SUBMITTER: Roth N 

PROVIDER: S-EPMC7340261 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature