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Erschienen in:
01.01.2012
Reaction behaviour of Ni1−x M x O’s (M = Li, Na) formation and its thermoelectric properties
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2012
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Abstract
Reaction behaviour of the mixed reactant powder of NiO and M2CO3 (M = Li, Na) for the formation of Ni1−x
M
x
O (M = Li, Na) was investigated. Ni1−x
M
x
O (M = Li, Na) compacts were fabricated by sintering green compacts of the mixed reactant powder at 1,173 K for 5 h in air. The results indicated that Ni1−x
M
x
O (M = Li, Na) was successfully synthesized when the sintering temperature was approximately above 800 K. In addition, the resultant Ni1−x
M
x
O (M = Li, Na) kept the same crystal structure with that of NiO (except for x = 0.4), but the diffraction peaks were found to shift to larger diffraction degrees compared with that of NiO. Interestingly, Li ions distribute in the lattice of NiO uniformly. Meanwhile, the electrical resistivity of the sintered compacts decreased and their semiconductor behaviour was always maintained with the increase of doping Li or Na. The power factor was increased significantly and exceeded 1.8 × 10−4 Wm−1 K−2 at 823 K.