Microwave synthesis combined with SPS sintering to fabricate Pb doped p-type BiCuSeO oxyselenides thermoelectric bulks in a few minutes. (1st July 2021)

• Record Type: Journal Article
• Authors: Lei, Ying; Zheng, Rui; Yang, Haoyue; Li, Yu; Yong, Chao; Jiang, Xiaowu; Liu, Rui; Wan, Rundong
• Is Part Of: Scripta materialia. Number 199(2021)
• Publication Date: 2021-07-01
• Subjects: BiCuSeO oxyselenides -- Microwave synthesis -- Pb doping -- Electrical transport properties -- Thermoelectric figure of merit (ZT); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113885
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: An efficient technique to fabricate BiCuSeO oxyselenides thermoelectric bulks is studied. Pb doped p-type BiCuSeO ingots are synthesized by microwave processing for 4 minutes and the bulk materials with 8.7~8.9 gcm −3 density are produced after spark plasma sintering for 5 minutes. The XRD and XPS detection results show that all the samples have nearly a single phase indexed to tetragonal BiCuSeO, and the peak positions of Pb 4f7/2 and 4f5/2 simple spin-orbit doublet peaks in Bi0.98 Pb0.02 CuSeO and Bi0.90 Pb0.10 CuSeO respectively are 137.93 and 142.76 eV, and 137.49 and 142.49 eV. Holes are the majority carriers with concentrations of 3.22 10 20 cm − ³ ~2.40 10 21 cm − ³ in the doped samples. Bi0.98 Pb0.02 CuSeO shows the highest ZT of 0.76 at 773 K and possible larger values can be achieved at a higher temperature. The fabricate technique described here showing great prospect in the research and manufacturing of thermoelectric bulks. Graphical abstract: Image, graphical abstract