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Abstract
In this work, a systematic theoretical investigation of thermoelectric properties of n-type doped solid solutions with
is presented in the temperature range
K. Electronic transport properties (
, S, and
) are calculated using the nearly-free-electron approximation and the Fermi–Dirac statistics. Thermal transport properties including contributions from carriers (
), electron–hole pairs (
) and phonons (
) computed using the Wiedemann–Franz law, Price’s theory and Srivastava’s scheme, respectively. In a very good agreement with available experimental measurements, among with
samples, the highest value for thermoelectric figure of merit ZT is found to be 1.41 at 800 K for
sample owing to its highest electrical conductivity and the lowest lattice thermal conductivity values. Additionally, by theoretically considering the doping levels as
, we suggest that at 800 K ZT goes up by 30% for
sample with the value of
compared to
sample due to increment in the electrical conductivity and additional mass defect effects to the phonon thermal conductivity.
Notes
No potential conflict of interest was reported by the author.