학술논문
Effect of co‐substitution on complex thermoelectric compounds: The Zintl phase Ba 1‐ x Sr x Zn 2‐ y Cu y Sb 2 system
Effect of co-substitution on complex thermoelectric compounds: The Zintl phase Ba1-xSrxZn2-yCuySb2 system
Effect of co-substitution on complex thermoelectric compounds: The Zintl phase Ba1-xSrxZn2-yCuySb2 system
Document Type
Article
Source
Bulletin of the Korean Chemical Society, 45(2), pp.165-170 Feb, 2024
Subject
Language
English
ISSN
1229-5949
0253-2964
0253-2964
Abstract
Three co‐substituted quaternary and quinary Zintl phases belonging to the Ba 1‐ x Sr x Zn 2‐ y Cu y Sb 2 ( x = 0, 0.09; 0.24 ≤ y ≤ 0.42) system were prepared by the molten Pb metal‐flux method. Co‐substitution using the cationic Sr and anionic Cu for Ba and Zn was initially applied to lower the thermal conductivities and to improve the electric conductivities of these title compounds simultaneously. The homogeneities of single‐phase products were verified by powder x‐ray diffraction analysis, and the BaCu 2 S 2 ‐type orthorhombic crystal structures with the Ba/Sr and the Zn/Cu mixed‐sites were refined by single crystal x‐ray diffraction analysis. Structural selectivity for the observed BaCu 2 S 2 ‐type phase was rationalized by the radius ratio of cationic and anionic elements, where r + / r − > 1. DFT calculations using the three structural models revealed that the Sr and Cu substitutions can increase the structural stability and the hole carrier concentration. A series of temperature‐dependent electrical transport property measurements for BaZn 1.76 Cu 0.24 Sb 2 and Ba 0.91 Sr 0.09 Zn 1.70 Cu 0.30 Sb 2 successfully proved that the co‐substitution using Sr and Cu enhanced electrical conductivities, but reduced the Seebeck coefficients resulting in the slight change in power factor.
Three co-substituted quaternary and quinary Zintl phases belonging to the Ba1-xSrxZn2-yCuySb2 (x = 0, 0.09; 0.24 ≤ y ≤ 0.42) system were prepared by the molten Pb metal-flux method. Co-substitution using the cationic Sr and anionic Cu for Ba and Zn was initially applied to lower the thermal conductivities and to improve the electric conductivities of these title compounds simultaneously. The homogeneities of single-phase products were verified by powder x-ray diffraction analysis, and the BaCu2S2-type orthorhombic crystal structures with the Ba/Sr and the Zn/Cu mixed-sites were refined by single crystal x-ray diffraction analysis. Structural selectivity for the observed BaCu2S2-type phase was rationalized by the radius ratio of cationic and anionic elements, where r+/r > 1. DFT calculations using the three structural models revealed that the Sr and Cu substitutions can increase the structural stability and the hole carrier concentration. A series of temperaturedependent electrical transport property measurements for BaZn1.76Cu0.24Sb2 and Ba0.91Sr0.09Zn1.70Cu0.30Sb2 successfully proved that the co-substitution using Sr and Cu enhanced electrical conductivities, but reduced the Seebeck coefficients resulting in the slight change in power factor.
Three co-substituted quaternary and quinary Zintl phases belonging to the Ba1-xSrxZn2-yCuySb2 (x = 0, 0.09; 0.24 ≤ y ≤ 0.42) system were prepared by the molten Pb metal-flux method. Co-substitution using the cationic Sr and anionic Cu for Ba and Zn was initially applied to lower the thermal conductivities and to improve the electric conductivities of these title compounds simultaneously. The homogeneities of single-phase products were verified by powder x-ray diffraction analysis, and the BaCu2S2-type orthorhombic crystal structures with the Ba/Sr and the Zn/Cu mixed-sites were refined by single crystal x-ray diffraction analysis. Structural selectivity for the observed BaCu2S2-type phase was rationalized by the radius ratio of cationic and anionic elements, where r+/r > 1. DFT calculations using the three structural models revealed that the Sr and Cu substitutions can increase the structural stability and the hole carrier concentration. A series of temperaturedependent electrical transport property measurements for BaZn1.76Cu0.24Sb2 and Ba0.91Sr0.09Zn1.70Cu0.30Sb2 successfully proved that the co-substitution using Sr and Cu enhanced electrical conductivities, but reduced the Seebeck coefficients resulting in the slight change in power factor.