World Journal of Engineering Research and Technology

Prof. Dr. Huynh Van Cong*

ABSTRACT

In the n+(p+) − p(n) ????????????????????−????????????- crystalline alloy, 0 ≤ ???? ≤ 1, all the numerical results of electrical-and- thermoelectric coefficients, obtained in our previous work (Van Cong, 2018; Van Cong et al., 1984), are now revised and performed, by basing on our basic expressions, given Equations (1, 3, 5, 7, 11, 14, 19). Some remarkable results could be cited in the following. In Tables 5n (5p) given Appendix 1, for a given impurity density N and with increasing temperature T, and then in Tables 6n (6p) given Appendix 1, for a given T and with decreasing N, the reduced Fermi-energy ξn (p) decreases, and other thermoelectric coefficients are in variations, as indicated by the arrows as: (increase: ↗, decrease: ↘). Further, one notes in these Tables that with increasing T (or with decreasing N) oneobtains: (i) for ξn (p) ≃ 1.8138, while the numerical results of the See beck coefficient S present a same minimum (S) min. (≃ −1.563 × 10−4 ), those of the figure of merit ZT show a same maximum (ZT) max. = 1, (ii) for ξn (p) = 1, S, ZT, the Mott figure of merit (ZT) Mott, the Van-Cong coefficient VC, and the Thomson coefficient Ts present the same results: −1.322 × 10−4 , 0.715, 3.290, −1.105 × 10−4 , and 1.657 × 10−4 , respectively, and (iii) for ξ n ≃ 1.8138, (ZT) Mott = 1. It seems that these same results could represent a new law in the thermoelectric properties, obtained in the degenerate case.

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