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Thermoelectric and Mechanical Properties of Ca0.9Yb0.1MnO3 Based Materials

Published online by Cambridge University Press:  01 February 2011

Atsuko Kosuga ,
Saori Urata  and
Ryoji Funahashi
Atsuko Kosuga
Affiliation:
kosuga-atsuko@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Nanotechnology Research Institute, 1-8-31, Midorigaoka, Osaka, 563-8577, Japan, +81-72-751-9541, +81-72-751-9622
Saori Urata
Affiliation:
urata-s@aist.go.jp, Japan Science and Technology Agency, 4-1-8, Honmachi, Kawaguchi, Saitama, 332-0012, Japan
Ryoji Funahashi
Affiliation:
funahashi-r@aist.go.jp, National Institute of Advanced Industrial Science and Technology, 1-8-31, Midorigaoka, Ikeda, Osaka, 563-8577, Japan
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Abstract

The Ca0.9Yb0.1MnO3/Ag composites(the ratio of Ag to Ca0.9Yb0.1MnO3 was 0, 4.7, 9.4, and 18.8 wt %) were prepared by wet milling various amounts of Ca0.9Yb0.1MnO3 and Ag2O powder mixtures followed by sintering in order to improve the mechanical properties of Ca0.9Yb0.1MnO3 for n-type legs of thermoelectric oxide devices. The obtained composites consisted of two phases such as Ca0.9Yb0.1MnO3 and metallic silver from the X-ray diffraction (XRD) analysis. The scanning electron microscope (SEM) analysis indicated that the Ag particles, the size of which was within 5 μm, were homogeneously dispersed in Ca0.9Yb0.1MnO3 matrix for all the composites. The σf of 18.8 wt% Ag composite became 251 MPa, which was 2 times larger value than that of Ca0.9Yb0.1MnO3. The power factor (S2ρ) was slightly improved by the addition of silver particles. The maximum S2ρ, i.e. 0.26 mWm-1K-2 at 573 K was obtained for 18.8 wt% Ag composite.

Keywords

strengthtoughnesselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U07-10
Copyright
Copyright © Materials Research Society 2008

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