Abstract
A method is given for obtaining the Nernst-Ettingshausen dimensionless figure of merit, in a direct measurement, as the ratio of two voltages. A discussion of the method is given for experiments involving rectangular sample geometries and also for more general geometrical configurations. Both isotropic and anisotropic materials are considered. The method is based on measurements of the ratio of the adiabatic electrical resistance to the isothermal electrical resistance. The superposition of the voltage of the Peltier-Seebeck effect is avoided by arranging for the completion of the experiments in a length of time which is short compared to the Peltier-Seebeck time constant for the sample. The required equipment and circuitry are simple, being similar to a four-probe resistivity measurement circuit with the voltage being determined by use of an oscilloscope.
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