Thermoelectric Power of the Copper-Nickel Chromite Cu1-xNixCr2O4

K. A. Mohammed, M. S. Abdul-Rab

Abstract


The thermoelectric power of the copper-nickel chromite system Cu1-xNixCr2O4 (0 ≤ x ≤ 1) has been measured over the temperature range from 300 K to 550 K. These compounds have been prepared using the solid state reaction method. Values of the thermoelectric power are relatively high and remain almost constant as temperature rises. These behaviours have been attributed to the charge carrier concentrations, which remain constant as expected from the hopping conduction mechanism. Samples with 1.0, 0.8 and 0.7 of Ni content at temperatures 315 K, 350 K and 450 K have shown clear variation in values of the thermoelectric power, respectively. These variations have been attributed to the cubic-tetragonal structural phase transformation, which is caused by the cooperative Jahn Teller effect.

Keywords


Thermoelectric power, Seebeck Effect, Jahn Teller Effect, Copper-Nickel Cromites

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