In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 26, No. 15 ( 2011-08-14), p. 1857-1860
Abstract:
We have synthesized single- and polycrystal Ba 8 Al x Si 46− x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski method in an argon atmosphere. Polycrystal sample was prepared by arc melting and annealed at 850 °C for 100 h in an argon atmosphere. The Seebeck coefficients of single- and polycrystal Ba 8 Al 12 Si 34 at 500 °C were 44.5 and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficients depend on carrier concentration, which is related to aluminum content. The electrical resistivity of the single-crystal sample with 0.49 mΩcm was lower than that of the polycrystal sample with 0.95 mΩcm because of the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0 × 10 −4 V 2 /K 2 Ωm was higher than that of the polycrystal sample with 3.0 × 10 −4 V 2 /K 2 Ωm at 500 °C. It is suggested that single crystallization is efficient for improvement of the thermoelectric property in the Ba 8 Al x Si 46− x clathrate.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2011.193
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2011
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
Permalink