Thermoelectric properties of Eu(Zn1−xCdx)2Sb2

Abstract

The thermoelectric performance of EuZn(2)Sb(2) and EuCd(2)Sb(2) was optimized by mixed occupation of the transition metal position. Samples in the solid solution Eu(Zn(1-x)Cd(x))(2)Sb(2) with the CaAl(2)Si(2)-type crystal structure (space group Pm1) were prepared from the elements for compositions with x = 0, 0.1, 0.3, 0.5 and 1. The thermoelectric properties were investigated after densification of the products by spark plasma sintering (SPS). The samples show low electrical resistivity, high thermopower and a low lattice thermoconductivity. The highest ZT value of 1.06 at 650 K is obtained for x = 0.1.

Thermoelectric transport properties of CaMg2Bi2, EuMg2BiMay1, McGuire2, Singh3 et al. 2012Phys. Rev. B

“…In the analogous antimonides, high zT is obtained for Seebeck coefficients between approximately 180 and 250 µV/K. 1,3,5,7 In CaMg 2 Bi 2 , the calculation results qualitatively suggest optimal doping levels near 5×10…”

“…The highest figure of merit reported within this family of materials is zT = 1.2 at 700 K in YbCd 1.6 Zn 0.4 Sb 2 , 1 while zT values between 0.5 and 1.1 are typical. [2][3][4][5][6][7][8] In general, ternary antimonides that are understood using Zintl chemistry have received significant attention within the thermoelectric community due to their tunability and structural complexity. [9][10][11][12][13][14][15][16][17][18] However, the analogous bismuthides have received much less attention.…”

CdI2 structure type as potential thermoelectric materials: Synthesis and high temperature thermoelectric properties of the solid solution TiSxSe2−x

“…For example, several compounds crystallizing in the layered structures type CaAl 2 Si 2 and CdI 2 have respectable thermoelectric properties and more importantly demonstrate that there is a great deal of compounds susceptible of possessing interesting thermoelectric properties precisely because of the flexibility 0925-8388/$ -see front matter © 2012 Elsevier B.V. All rights reserved. doi:10.1016/j.jallcom.2012.01.067 of the structures and thus because of the numerous chemical compositions that can adopt such adaptable structures [7][8][9][10][11][12]15,17]. In these structures, whereas various species can be intercalated between the layers, it is also often possible to introduce compositional disorder within the layer itself by using multiple cations (transition metals) and/or multiple anions.…”

“…In fact, the past few years have witnessed the emergence of new families of compounds, some of which are now regarded as promising thermoelectric materials. It is the case of certain Zintl phases such as Yb 14 MnSb 11 and its derivative for high temperature spatial applications [2][3][4][5][6], or some members of the CaAl 2 Si 2 structure type [7][8][9][10][11][12]. Other such new families are the molybdenum selenides based on Mo 9 Se 11 clusters [13], and layered sulfides [14,15], oxyselenides [16] or selenides [17].…”

Thermoelectric Properties of Polycrystalline SrZn2Sb2 Prepared by Spark Plasma Sintering

“…1). Promising ZT-values were found for the ternaries EuZn 2 Sb 2 with ZT = 0.92 at 713 K, 4 EuCd 2 Sb 2 with ZT = 0.6 at 617 K, 5 BaZn 2 Sb 2 with ZT = 0.31 at 675 K, 6 for compounds in the quaternary systems Ca x Yb 1Àx Zn 2 Sb 2 (x = 1) with ZT = 0.56 at 773 K, 7 Eu(Zn 1Àx Cd x ) 2 Sb 2 (x = 0.1) with ZT = 1.06 at 650 K, 8 YbCd 2Àx Zn x Sb 2 (x = 0.4) with ZT = 1.2 at 700 K, 9 and YbZn 2Àx Mn x Sb 2 (x = 0.1) with ZT = 0.65 at 726 K. 10 The good thermoelectric properties of these materials were attributed to the similar electronegativities of Zn, Cd, and Sb, leading to sufficient carrier mobility, as well as the high atomic mass of Sb, leading to low lattice thermal conductivity. 11 Another representative for this type of compounds is SrZn 2 Sb 2 ( Fig.…”