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Thermomigration and Soret effect in Na x CoO 2 as thermoelectric material: Preparation and characterization of sodium cobaltate thin films (Phys. Status Solidi A 5∕2016)
Author(s) -
Schneider Christian,
Schichtel Patrick,
Mogwitz Boris,
Straubinger Rainer,
Beyer Andreas,
Rohnke Marcus,
Volz Kerstin,
Janek Jürgen
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201670631
Subject(s) - thermoelectric effect , thermophoresis , temperature gradient , materials science , diffusion , epitaxy , figure of merit , characterization (materials science) , seebeck coefficient , thermoelectric materials , charge (physics) , charge carrier , condensed matter physics , chemical engineering , nanotechnology , thermodynamics , layer (electronics) , optoelectronics , physics , nanofluid , quantum mechanics , nanoparticle , engineering
Thermomigration (Ludwig‐Soret effect) can significantly influence the properties of thermoelectric materials by locally changing the charge carrier concentrations and, therefore, the figure of merit. The study by Schneider et al. (pp. 1284–1295 ) deals with evolving sodium concentration gradients by applying a temperature gradient parallel to the natural layered structure of epitaxially grown Na x CoO 2 . A self‐designed experimental set‐up enables both the evaluation of the heat of transport and the chemical diffusion coefficient. The results represent one of the very rare examples of the Soret effect in thermoelectric materials.