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Reduction of the thermal conductivity of the thermoelectric material ScN by Nb alloying
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Tech Univ Denmark, Roskilde, Denmark.
Sorbonne Universites, Paris, France.
Indian Institute Technology Mandi, India.
Show others and affiliations
2017 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 122, no 2, 025116Article in journal (Refereed) Published
Abstract [en]

ScN-rich (Sc,Nb)N solid solution thin films have been studied, motivated by the promising thermoelectric properties of ScN-based materials. Cubic Sc1-xNbxN films for 0 amp;lt;= x amp;lt;= 0.25 were epitaxially grown by DC reactive magnetron sputtering on a c-plane sapphire substrate and oriented along the (111) orientation. The crystal structure, morphology, thermal conductivity, and thermoelectric and electrical properties were investigated. The ScN reference film exhibited a Seebeck coefficient of -45 mu V/K and a power factor of 6 x 10(-4) W/m K-2 at 750K. Estimated from room temperature Hall measurements, all samples exhibit a high carrier density of the order of 10(21) cm(-3). Inclusion of heavy transition metals into ScN enables the reduction in thermal conductivity by an increase in phonon scattering. The Nb inserted ScN thin films exhibited a thermal conductivity lower than the value of the ScN reference (10.5W m(-1) K-1) down to a minimum value of 2.2 Wm(-1) K-1. Insertion of Nb into ScN thus resulted in a reduction in thermal conductivity by a factor of similar to 5 due to the mass contrast in ScN, which increases the phonon scattering in the material. Published by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2017. Vol. 122, no 2, 025116
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-139558DOI: 10.1063/1.4993913ISI: 000405663800047OAI: oai:DiVA.org:liu-139558DiVA: diva2:1130113
Note

Funding Agencies|European Research Council under the European Community [335383]; Swedish Foundation for Strategic Research (SSF) through the Future Research Leaders 5 program; Swedish Research Council (VR) [621-2012-4430, 2016-03365]; Knut and Alice Wallenberg Foundation through the Wallenberg Academy Fellows program; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; project NanoCaTe (FP7-NMP) [604647]; project CTEC [1305-00002B]

Available from: 2017-08-08 Created: 2017-08-08 Last updated: 2017-08-29

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Tureson, NinaSchmidt, SusannLe Febvrier, ArnaudEklund, Per
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