Mechanistic Insights into the Formation of Thermoelectric TiNiSn from In Situ Neutron Powder Diffraction.

ABSTRACT: Half-Heusler alloys are leading contenders for application in thermoelectric generators. However, reproducible synthesis of these materials remains challenging. Here, we have used in situ neutron powder diffraction to monitor the synthesis of TiNiSn from elemental powders, including the impact of intentional excess Ni. This reveals a complex sequence of reactions with an important role for molten phases. The first reaction occurs upon melting of Sn (232 °C), when Ni₃Sn₄, Ni₃Sn₂, and Ni₃Sn phases form upon heating. Ti remains inert with formation of Ti₂Ni and small amounts of half-Heusler TiNi_1+ySn only occurring near 600 °C, followed by the emergence of TiNi and full-Heusler TiNi_2y'Sn phases. Heu

SUBMITTER: Barczak SA 

PROVIDER: S-EPMC10173456 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature