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Determination of in‐plane thermal conductivity of Na x Co 2 O 4 single crystals via a parallel thermal conductance (PTC) technique
Author(s) -
Tang Xiaofeng,
Aaron Kelvin,
He Jian,
Tritt Terry M.
Publication year - 2008
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.200824028
Subject(s) - thermal conductivity , conductance , analytical chemistry (journal) , mean free path , reproducibility , materials science , lattice constant , conductivity , lattice (music) , phonon , chemistry , condensed matter physics , physics , optics , diffraction , scattering , chromatography , acoustics , composite material
A novel parallel thermal conductance (“PTC”) system was specifically developed to conduct the steady state thermal conductivity measurement on small size samples such as single crystals of Na x Co 2 O 4 as reported here. The accuracy and reproducibility of the PTC system has been confirmed by measuring several standard reference materials. The in‐plane thermal conductivity κ of Na x Co 2 O 4 single crystals grown by a NaCl flux method was measured from 10 K to 300 K and κ was found to be ∼5 W m –1 K –1 at 300 K. The phonon mean free path (MFP) is estimated to be l ph ∼ 9 Å at 300 K, which is comparable to the lattice constant but much smaller than the reported MFP of conducting carriers. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)