MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Microscale Seebeck Scanning of Polycrystalline Samples of N-Type AgPb18SbTe20 and P-Type AgPb9Sn9SbTe20
Atsuko KosugaKen KurosakiHiroaki MutaChristian StieweGabriele KarpinskiEckhard MüllerShinsuke Yamanaka
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2006 Volume 47 Issue 6 Pages 1440-1444

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Abstract

We prepared polycrystalline-sintered samples of n-type AgPb18SbTe20 and p-type AgPb9Sn9SbTe20 and performed the microscale Seebeck scanning examination under room temperature conditions. Despite both samples appeared to be homogeneous by Energy Dispersive X-ray (EDX) and X-ray Diffraction (XRD) analyses, both samples contained apparently a microscale distribution of the Seebeck coefficient as observed by Seebeck microprobe analysis. The degree of the Seebeck coefficient distribution became larger in the order of PbTe, AgPb18SbTe20, and AgPb9Sn9SbTe20, indicating that an increase in the number of compositional elements of the materials led to a broader distribution of the Seebeck coefficient values. The statistical analysis of the Seebeck coefficient distribution of p-type AgPb9Sn9SbTe20 indicated a homogeneous phase seemed to appear only at the lowest Seebeck coefficient values (slightly above 50 μV/K).

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© 2006 The Thermoelectrics Society of Japan
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