Structural and thermoelectric properties of Pb4In2.6Bi3.4Se13. Issue 3 (September 2021)

• Record Type: Journal Article
• Authors: Wong-Ng, W.; Guo, J.; Yan, Y.; Kaduk, J. A.
• Is Part Of: Powder diffraction. Volume 36:Issue 3(2021)
• Page Start: 151
• Page End: 158
• Publication Date: 2021-09
• Subjects: Pb4In2.6Bi3.4Se13 -- thermoelectric material -- thermoelectric property measurements -- crystal structure -- powder X-ray diffraction pattern; Powder metallurgy -- Periodicals; Materials -- Analysis -- Periodicals; 620.1127
• DOI: 10.1017/S0885715621000385
• Languages: English
• ISSNs: 0885-7156

Abstract

Abstract : Quaternary selenide, Pb4 In2.6 Bi3.4 Se13 ( x = 2.4 member of the Pb4 (In x Bi6- x Se13 solid solution), was synthesized by a solid-state technique, and its structure was determined using powder X-ray diffraction (XRD). Pb4 In2.6 Bi3.4 Se13 crystallizes in the orthorhombic space group Pbam (No. 55) with Z = 4. Lattice parameters and calculated density were determined to be a = 22.152(5) Å, b = 27.454(5) Å, and c = 4.1354(6) Å, V = 2515.0(11) Å 3, and Dx = 7.490 g cm − 3 . The structure consists of Z -shaped ribbon units and corner-shared infinite one-dimensional [InSe4 ]∞ chains running parallel to the c -axis. The chains and ribbons are further connected by Pb atoms to form a three-dimensional network. Pb atoms are situated in the center of bicapped trigonal prisms. The compound exhibits a semiconductor feature. The Seebeck coefficient of Pb4 In2.6 Bi3.4 Se13 was found to be −180 μV K −1 at 295 K and −380 μV K −1 at 600 K. Combining the values of Seebeck coefficient, electrical conductivity, and thermal conductivity yield a figure of merit, ZT, of about 0.175 at 700 K. The powder XRD pattern of Pb4 In2.6 Bi3.4 Se13 was also determined.