0000000000555577

AUTHOR

Myriam H. Aguirre

showing 2 related works from this author

Half-Heusler superlattices as model systems for nanostructured thermoelectrics

2015

The efficiency of thermoelectric materials is directly related to the dimensionless figure of merit , therefore, one of the means to improve ZT is to reduce the thermal conductivity. Our research focuses on half-Heusler superlattices (SLs) and the relationship between the SL period and the thermal conductivity. The cross-plane thermal conductivity of DC-sputtered TiNiSn/HfNiSn SLs was measured by the 3 method at room temperature and a clear reduction of was achieved for all SL periods, in particular for periods smaller than 20 nm. Moreover, the thermal conductivities of TiNiSn and HfNiSn single films display reduced values compared to the literature data for bulk materials. Furthermore, we …

010302 applied physicsMaterials scienceCondensed matter physicsDimensionless figure of meritSuperlattice02 engineering and technologySurfaces and InterfacesSurface finish021001 nanoscience & nanotechnologyCondensed Matter PhysicsThermoelectric materials01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsQuality (physics)Thermal conductivity0103 physical sciencesThermalMaterials ChemistryElectrical and Electronic Engineering0210 nano-technologyphysica status solidi (a)
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Thermal conductivity of half-Heusler superlattices

2014

Thin films and superlattices (SLs) of TiNiSn and ZrHfNiSn layers have been grown by dc magnetron sputtering on MgO (100) substrates to reduce the thermal conductivity, aiming for improvement of the thermoelectric figure of merit ZT. The thermal conductivity of 1 Wm−1K−1 was measured by the differential 3ω method for an SL with a periodicity of 8.8 nm. In addition to x-ray diffraction analysis of the SL crystal structure, smooth interfaces were confirmed by scanning/transmission electron microscopy.

DiffractionMaterials sciencebusiness.industrySuperlatticeCrystal structureSputter depositionCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsThermoelectric figure of meritThermal conductivityTransmission electron microscopyMaterials ChemistryOptoelectronicsElectrical and Electronic EngineeringThin filmbusinessSemiconductor Science and Technology
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