6533b85afe1ef96bd12b9fb8

RESEARCH PRODUCT

Phase separation in the quaternary Heusler compound CoTi(1−x)MnxSb – A reduction in the thermal conductivity for thermoelectric applications

Joachim BarthP. KlaerTanja GrafClaudia FelserBenjamin BalkeHans-joachim Elmers

subject

Materials scienceCondensed matter physicsPhonon scatteringMechanical EngineeringMetallurgyMetals and Alloysengineering.materialCondensed Matter PhysicsThermoelectric materialsHeusler compoundThermal conductivityMechanics of MaterialsPhase (matter)Thermoelectric effectengineeringGeneral Materials ScienceGrain boundarySolid solution

description

We investigate the phase separation of the solid solution CoTi(1−x)MnxSb into the two Heusler compounds CoTiSb and CoMnSb. Energy-dispersive X-ray spectroscopy measurements on the two-phase material reveal the presence of size- and shape-tunable CoTiSb regions in a CoMnSb matrix. We demonstrate that the formed phase and grain boundaries have a considerable influence on the phonon scattering processes, which leads to a reduction in the thermal conductivity by a factor of three compared to single-phase CoTiSb.

yearjournalcountryeditionlanguage
2010-12-01Scripta Materialia
https://doi.org/10.1016/j.scriptamat.2010.08.039