Improving the thermoelectric performance of Ti-doped NbFeSb by substitutional doping of the Sb atoms with the isoelectric and heavy Bi atoms
Joseph Ngugi Kahiu, Samuel Kimani Kihoi, Ho Seong Lee
Abstract
Solute Bi atoms in Nb 0.8 Ti 0.2 FeSb 1− x Bi x samples scatter phonons and increase the effective mass, increasing the ZT within the Bi solubility limit; above this limit, concomitant Sb vacancies disproportionately donate holes, resulting in poor ZT .
Topics & Concepts
Materials scienceDopingThermoelectric effectPhononSeebeck coefficientSolid solubilityCondensed matter physicsLimit (mathematics)Analytical Chemistry (journal)Solid solutionMetallurgyThermodynamicsThermal conductivityOptoelectronicsPhysicsChemistryMathematicsMathematical analysisChromatographyComposite materialAdvanced Thermoelectric Materials and DevicesHeusler alloys: electronic and magnetic propertiesChalcogenide Semiconductor Thin Films