Thermoelectric and magnetic properties of spark plasma sintered REB66 (RE = Y, Sm, Ho, Tm, Yb). Issue 10 (August 2020)

• Record Type: Journal Article
• Authors: Sauerschnig, P.; Vaney, J.B.; Michiue, Y.; Kouzu, K.; Yamasaki, T.; Okada, S.; Yoshikawa, A.; Shishido, T.; Mori, T.
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 10(2020)
• Page Start: 3585
• Page End: 3591
• Publication Date: 2020-08
• Subjects: Thermoelectric -- Boride -- Sintering -- Magnetic -- Rare earth; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.03.014
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A synthesis route was successfully established to reliably synthesize the high temperature thermoelectric material REB66 (RE = Y, Sm, Ho, Tm, Yb) much more readily than the typical single crystal growth. Thermoelectric properties of HoB66 and TmB66 are also investigated for the first time. The REB66 samples synthesized by spark plasma sintering showed thermoelectric properties equivalent to those measured on single crystals. A figure of merit ZT around 0.1 at 973 K was obtained with a sharply increasing trend toward higher temperatures. Strikingly, the thermoelectric properties of these compounds appear to be almost independent of the microstructure. The nature of the rare earth does not seem to strongly affect the thermoelectric properties, differences originating mainly from different compositions or the presence of secondary phases. Relatively large negative Curie-Weiss temperatures θ were observed, and an increasing coupling indicated from HoB66 to YbB66 . This could be indicative of an unusual coupling mechanism.