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RAlB4 (R = rare earth element) has attracted increasing attention due to recent reports on its properties in magnetic, thermoelectric and superconducting materials. The authors developed and we investigated the formation of the solid solution Yb(Al0.995T0.005)B4 (T = Cr, Mn or Fe) compounds in which the Al position of YbAlB4 is substituted with T atoms using the Al flux method. In this study, crystals of the boride Yb(Al0.995T0.005)B4 (T =Mo or W) were grown by using Al flux mixed with T metal at 1773 K for 5h. Yb(Al0.995W0.005)B4 was obtained as the single phase, however, in the case of Yb(Al0.995Mo0.005)B4, a small amount of AlMoB crystals was contained. The crystals were measured using a micro-Vickers hardness tester, and the oxidation resistance was examined in air using DTA-TG apparatus. Comparing the lattice constants and chemical composition of YbAlB4 and Yb(Al0.995T0.005)B4, it were understood that the lattice constant of Yb(Al,T)B4 were larger than that of YbAlB4 crystals. Yb(Al,T)B4 were grown as a solid solution contained about 40 % of each T metal. The hardness values were 11.0(±0.7) GPa for Yb(Al0.995Mo0.005)B4 and 15.7(±1.9) GPa for Yb(Al0.995W0.005)B4. The oxidation of Yb(Al,T)B4 starts in the range of 971–987 K. The oxidation onset temperature during the heating of Yb(Al,T)B4 is about 100 K higher than YbAlB4.

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• In Copyright
  

Keyword: boride

Date published: 2024-10-31

Publisher: Elsevier BV

Journal:

• Solid State Sciences (ISSN: 12932558) vol. 158 p. 107735-107735 107735

Funding:

• Institute for Materials Research, Tohoku University 202212-CRKKE-0020
• Japan Society for the Promotion of Science JP19K05643
• Japan Society for the Promotion of Science JP20H05258
• Japan Society for the Promotion of Science JP23K04373
• Japan Society for the Promotion of Science 202211-RDKGE-0008
• Japan Society for the Promotion of Science 202311-RDKGE-0001

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5196

First published URL: https://doi.org/10.1016/j.solidstatesciences.2024.107735

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Updated at: 2025-01-22 08:47:12 +0900

Published on MDR: 2025-01-22 12:30:29 +0900