Thermoelectric Transport Properties of n-Type Sb-doped (Hf,Zr,Ti)NiSn Half-Heusler Alloys Prepared by Temperature-Regulated Melt Spinning and Spark Plasma Sintering
- Authors
- Bae, Ki Wook; Hwang, Jeong Yun; Kim, Sang-il; Jeong, Hyung Mo; Kim, Sunuk; Lim, Jae-Hong; Kim, Hyun-Sik; Lee, Kyu Hyoung
- Issue Date
- Jul-2020
- Publisher
- MDPI
- Keywords
- TiNiSn; half-Heusler; sub-micron grain; thermoelectric; thermal conductivity
- Citation
- APPLIED SCIENCES-BASEL, v.10, no.14
- Journal Title
- APPLIED SCIENCES-BASEL
- Volume
- 10
- Number
- 14
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11646
- DOI
- 10.3390/app10144963
- ISSN
- 2076-3417
- Abstract
- Herein we report a significantly reduced lattice thermal conductivity of Sb-doped Hf0.35Zr0.35Ti0.3NiSn half-Heusler alloys with sub-micron grains (grain size of similar to 300 nm). Polycrystalline bulks of Hf0.35Zr0.35Ti0.3NiSn1-xSbx(x= 0.01, 0.02, 0.03) with a complete single half-Heusler phase are prepared using temperature-regulated melt spinning and subsequent spark plasma sintering without a long annealing process. In these submicron-grained bulks, a very low lattice thermal conductivity value of 2.4 W m(-1)K(-1)is obtained at 300 K due to the intensified phonon scatterings by highly dense grain boundaries and point-defects (Zr and Ti substituted at Hf-sites). A maximum thermoelectric figure of merit,zT, of 0.5 at 800 K is obtained in Hf0.35Zr0.35Ti0.3NiSn0.99Sb0.01.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11646)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.