Herringbone structure in GeTe-based thermoelectric materials. (1st June 2015)

• Record Type: Journal Article
• Authors: Lee, Ho Seong; Kim, Bong-Seo; Cho, Chang-Woo; Oh, Min-Wook; Min, Bok-Ki; Park, Su-Dong; Lee, Hee-Woong
• Is Part Of: Acta materialia. Volume 91(2015)
• Page Start: 83
• Page End: 90
• Publication Date: 2015-06-01
• Subjects: Thermoelectric compound -- GeTe -- Microstructure -- Domain unit -- TEM; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2015.03.015
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: We investigated the microstructure of GeTe-based thermoelectric materials by using transmission electron microscopy. GeTe-based materials with a rhombohedral structure showed a herringbone structure, which is described as a regular arrangement of domain structures. The crystal region with different rhombohedral axis formed a domain. Domains with different variants showed alternative white and black contrast. We proposed a parallelepiped domain unit surrounded by (0 0 1), ( 1 1 ¯ 0 ) and ( 1 1 1 ¯ ) planes. Domain units were arranged along a specific direction 〈0 0 1〉 and 〈1 1 0〉, which formed many colonies. Well-aligned colonies comprised various kinds of herringbone structures. Several herringbone structures were described in detail based on the transmission electron microscopy results.