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SOLID-STATE SYNTHESIS AND SOME PROPERTIES OF MAGNESIUM-DOPED COPPER ALUMINUM OXIDES

Published online by Cambridge University Press:  31 January 2011

Chang Liu
Affiliation:
liuchan4@msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, Michigan, United States
Fei Ren
Affiliation:
renf@ornl.gov, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, Tennessee, United States
Hsin Wang
Affiliation:
wangh2@ornl.gov, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, Tennessee, United States
Eldon D. Case
Affiliation:
casee@egr.msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, Michigan, United States
Donald T Morelli
Affiliation:
dmorelli@egr.msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, Michigan, United States
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Abstract

Copper aluminum oxide (CuAlO2) with delafossite structure is a promising candidate for high temperature thermoelectric applications because of its modest band gap, high stability and low cost. We investigate magnesium doping on the aluminum site as a means of producing higher electrical conductivity and optimized Seebeck coefficient. Powder samples were synthesized using solid-state reaction and bulk samples were prepared using both cold-pressing and hot-pressing techniques. Composition analysis, microstructural examination and transport property measurements were performed, and the results suggest that while hot-pressing can achieve high density samples, secondary phases tend to form and lower the performance of the materials.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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