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Development of Thermoelectric Materials
Using Magnetic Ceramics
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| Takeshi TOYODA, Kaduichi KITAGAWA and Shizuo NAKAMURA |
For the purpose of developing thermoelectric material that is stable in
a high temperature atmosphere, p-type and n-type ceramics were synthesized
and their crystal structure was evaluated using X-ray diffraction method.
After synthesizing the materials through two steps of solid state reaction
based on the results of a thermal gravity analysis, polycrystalline samples
of NaxCoO2(x = 0.7,0.8)and
Ca0.9La0.1MnO3
with a single phase structure were obtained. A thermoelectric device was
fabricated using 12 pairs of Na0.75CoO2
for p-type legs and Ca0.9La0.1MnO3
for n-type legs on an alumina substrate. The device generated an output
of 7.29mW under the thermal condition of hot side temperature at 364℃. The
thermal expansion measurement showed that it is important to reduce the
heat stress at the junctions between the legs and the substrate for prevention
of exfoliation.
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Keywords ■■■ |
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thermoelectric material, X-ray diffraction,
rietveld analysis, electric resistivity, thermal expansion coefficient |
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