Thermoelectric nanocrystalline YbCoSb laser prepared layers

0470066 - FZÚ 2017 RIV DE eng J - Journal Article
Jelínek, Miroslav - Zeipl, Radek - Kocourek, Tomáš - Remsa, Jan - Navrátil, Jiří
Thermoelectric nanocrystalline YbCoSb laser prepared layers.
Applied Physics A - Materials Science & Processing. Roč. 122, č. 3 (2016), s. 1-5, č. článku 155. ISSN 0947-8396. E-ISSN 1432-0630
R&D Projects: GA ČR(CZ) GA13-33056S
Institutional support: RVO:68378271 ; RVO:61389013
Keywords : nanocrystalline YbCoSb * thermoelectric layers * pulsed laser deposition
Subject RIV: BM - Solid Matter Physics ; Magnetism; CA - Inorganic Chemistry (UMCH-V)
Impact factor: 1.455, year: 2016

Filled thermoelectric YbxCo4Sb12 layers were prepared by pulsed laser deposition method. The Yb0.19Co4Sb12 target was fabricated by hot pressing. Various deposition conditions were tested: target-substrate distance d(T-S) (4 or 6 cm), ambient argon pressure (from 0.5 to 13 Pa), laser repetition rate (from 3 to 10 Hz), substrate temperature (from 250 to 400 degrees C) and laser fluence (in region from 0.8 to 5 J cm(-2)). Film roughness was determined by mechanical profilometer and by AFM. For d(T-S) = 4 cm we observed a deficit of Yb and surplus of Co. Sb was transferred from target to film roughly stoichiometrically (as measured by EDX). Films created at 0.8 J cm(-2) exhibited generally poor stoichiometry and mechanical properties. Optimal conditions and stoichiometric transport were found for d(T-S) = 6 cm and 13 Pa of Ar. XRD shows that the films were nanocrystalline with CoSb3 structure. Grain size was in the range of similar to 50-80 nm.
Permanent Link: http://hdl.handle.net/11104/0267801