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RESEARCH PRODUCT

Short and long range order of Half-Heusler phases in (Ti,Zr,Hf)CoSb thermoelectric compounds

Marcus Vinicius CastegnaroElisabeth RauschMaria Do Carmo Martins AlvesJonder MoraisBenjamin BalkeFabiano Bernardi

subject

DiffractionMaterials sciencePolymers and PlasticsExtended X-ray absorption fine structureMetals and AlloysSynchrotron radiation02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyThermoelectric materials01 natural sciences0104 chemical sciencesElectronic Optical and Magnetic MaterialsCrystallographyPhase (matter)Lattice (order)Thermoelectric effectCeramics and Composites0210 nano-technologySpectroscopy

description

Abstract The structural properties of (Ti,Zr,Hf)CoSb thermoelectric Half-Heusler compounds were investigated by synchrotron radiation based techniques. The short-range order, in particular the environment of the Co atoms, was studied by extended X-Ray absorption fine structure spectroscopy and the long range order by powder X-Ray diffraction. Structural models were obtained for the single phase materials TiCoSb0.85Sn0.15, ZrCoSb0.85Sn0.15, and HfCoSb0.85Sn0.15. These models were transferred for the phase-separated material Ti0.5Hf0.5CoSb0.85Sn0.15. As a result, proving that each Half-Heusler phase was well ordered, apart from the intermixing of Ti and Hf on its designated crystallographic lattice site.

yearjournalcountryeditionlanguage
2016-08-01Acta Materialia
https://doi.org/10.1016/j.actamat.2016.05.041