Enhanced Thermoelectric Properties of BiCoO<sub>3</sub> by Nickel Substitution
- 1 Department of Physics, University of Calicut, Malappuram, India
- 2 Department of Physics, Z.G. College, Calicut, India
- 3 Department of Physics, University of Calicut, Malappuram, India
Abstract
Micro crystalline materials of BiCoO 3 and Ni 0.5 Bi 0.5 CoO 3 have been prepared by solid state reaction technique. XRD studies of these polycrystalline materials confirmed the cubic structure with 197 I 23 space group. The substitution of nickel in place of bismuth resulted in lattice contraction. The thermoelectric properties were investigated in the temperature rang ing from 300°C to 700°C. The samples showed positive Seebeck coefficient. Nickel substitution with Bismuth is found to decrease the Seebeck coefficient and thermal conductivity but increase the electrical conductivity. The figure of merit (ZT) of the material was enhanced on nickel substitution. The ZT values increased with the increase of temperature which enables its utility in high temperature thermoelectric applications.
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