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Review Article

High-Performance Mg3Sb2-xBix Thermoelectrics: Progress and Perspective

Table 1

Basic physical and chemical information for the elements in the two n-type near-RT Mg3Sb2-xBix and Bi2Te3-xSex thermoelectrics. Oxygen is also included since it is often found in the synthesized samples. Most data are obtained from WebElements [101] while Shannon-Prewitt radii from KnowledgeDoor [102].

ElementMgSbBiTeSeO

Atomic number12518352348
Density (g/cm3)1.7386.6979.786.244.819
Abundances (ppm by weight)290000.20.0250.0010.05460000
Melting point (°C)650630.63271.3449.51221-218.3
Boiling point (°C)109013871564988685-182.9
Electronic configuration3s25s2 5p36s2 6p35s2 5p44s2 4p42s2 2p4
Electronegativity (Pauling)1.312.052.022.12.553.44
Atomic radius (Å)1.51.451.61.41.150.6
Pauling ionic radius (Å)0.65 Mg2+2.21 Te2-1.98 Se2-1.4 O2-
Shannon-Prewitt radius (Å) (coordination number)0.72 Mg2+(6)0.76 Sb3+(6)1.03 Bi3+(6)2.21 Te2-(6)1.98 Se2-(6)1.40 O2-(6)

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