High-Performance of Half-Heusler MNiSn (M=Hf,Zr) Single-Phase Thermoelectric Alloys Fabricated using Optical Floating Zone Melting

Autor:	Akihisa Zama, Tomoya Kuji, Shibata Yasufumi, Yoshinao Mishima, Yoshisato Kimura
Rok vydání:	2005
Předmět:	Zone melting Materials science Condensed matter physics Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Metallurgy Intermetallic Crystal growth Directional solidification Solid solution
Zdroj:	MRS Proceedings. 886
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-0886-f09-02
Popis:	We have succeeded to grow almost single-phase of Half-Heusler intermetallic compounds MNiSn, where M = (Hfx,Zr1−x) and x varies from 0 to 1, for the first time by directional solidification using optical floating zone melting (OFZ). Thermoelectric power and electrical resistivity can be dramatically improved since OFZ process effectively reduces solidification defects such as micro-cracks and cavities as well as unfavorable coexisting phases. Dimensionless thermoelectric figure of merit, ZT, of OFZ (Hf,Zr)NiSn alloys can be improved effectively by lowering the lattice thermal conductivity through the solid solution effects due to the substitution of Hf and Zr with each other. The maximum ZT value of 0.9 is achieved in (Hf0.5Zr0.5)NiSn at 963 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::797db0820ce7450498ded946e607f93e https://doi.org/10.1557/proc-0886-f09-02 Zobrazit plný text záznamu Full text from SpringerLink