Formation mechanism of twin structures in p-type (Bi0.25Sb0.75)2Te3 thermoelectric compound. (15th March 2019)

• Record Type: Journal Article
• Authors: Lee, Kap Ho; Dharmaiah, Peyala; Hong, Soon-Jik
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 437
• Page End: 441
• Publication Date: 2019-03-15
• Subjects: (Bi, Sb)2Te3 thermoelectric compound -- Twin structure -- Interfacial step -- Transmission electron microscopy (TEM); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.12.006
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The formation mechanism of twin structures in p-type (Bi0.25 Sb0.75 )2 Te3 compound was examined using high-resolution transmission electron microscopy (HR-TEM) and computer simulations. The results shown that the formation of twins is analogous to the twinning mechanism via synchronized activation of Shockley partial dislocations commonly observed terminating {111} growth and annealing twins in face centered cubic (FCC) metals. The 10 1 ¯ 0 boundary, as an incoherent twin boundary (ITB), is mobile due to its lower shear stress compared to that of the coherent {0001} twin boundary; thickness of the twin region can be reduced or increased according to the direction of the movement. Graphical abstract: Unlabelled Image