In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 51, No. 3R ( 2012-03-01), p. 035802-
Kurzfassung:
The thermophysical properties of Nb-doped TiO 2 (Nb:TiO 2 ) films were studied in terms of electrical conductivity and Nb concentration. The thermal diffusivity of Nb:TiO 2 films with various Nb concentrations was investigated and found to range from (1.2–2.1)×10 -6 m 2 s -1 . The thermal conductivity of Nb:TiO 2 films with 8.5 at. % Nb concentration is proportional to the electrical conductivity in conformity with the Wiedemann–Franz law. The thermal conductivity carried by phonons, λ ph , of Nb:TiO 2 films decreased with increasing Nb concentration. The mean free path of phonons, l ph , in Nb:TiO 2 films was estimated to be almost the same as the average distance between Nb impurities. The grain size was much larger than l ph . Thus, phonon scattering by Nb impurities should be the dominant factor for the change in λ ph .
Materialart:
Online-Ressource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.51.035802
Sprache:
Unbekannt
Verlag:
IOP Publishing
Publikationsdatum:
2012
ZDB Id:
218223-3
ZDB Id:
797294-5
ZDB Id:
2006801-3
ZDB Id:
797295-7
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