Publication Date:
2012-11-22
Description:
The structural, magnetic, electrical and thermal transport properties of the polycrystalline samples Ca 3 Co 4− x In x O 9 ( x = 0, 0.05, 0.10, 0.15, and 0.20) have been investigated systematically. The results indicate that the In-substitution has a negative effect on the low-temperature ferrimagnetic transition and the propagation of spin-density-wave. All In-doped samples have a much larger resistivity than that of the un-doped sample. And the temperature region where the Fermi liquid transport mechanism dominates is remarkably widened via In-doping. However, for the In-doped samples, as the In-doped content increases, the value of resistivity ρ decreases monotonously and the electronic correlation in the system enhances. With the addition of In-ions in Ca 3 Co 4 O 9 system, the thermopower S and the ZT value decrease. The results are suggested to originate from the variations of carrier concentration and lattice disharmony in this system induced by In-doping.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Permalink