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A single-phase RuB2 (orthorhombic, space group Pmmn) polycrystalline material was successfully synthesized by the arc melting method. The condition for obtaining a single-phase RuB2 material is dependent on the composition and form of the raw materials, namely using the composition of atomic ratio Ru:B = 1:2.1 and using granules Ru and B as the raw materials. The lattice constants of a single-phase RuB2 obtained by the arc melt method are a = 4.645(1), b = 2.865(1), c = 4.046(1) Å, V = 53.8(1) Å3. A thermogravimetric-differential thermal analysis (TG-DTA) for RuB2 was carried out from room temperature to 1473 K. The oxidation reaction of RuB2 begins at about 570 K, and the weight gain rate of final oxidation is 29%. Interestingly, the RuB2 material was found to have a significantly lower oxidation resistance than Ru metal. The product after heating up to 1473 K in air atmosphere is a mixture of RuB1.1 (RuB) and Ru phases, and B2O3 which is probably produced in an amorphous state. The values for electrical resistivity of RuB2 are in the ranges from 23.3 × 10−3 to 102.2 × 10−3 Ω ‧ cm.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: borides

Date published: 2025-01-15

Publisher: Japan Society of Powder and Powder Metallurgy

Journal:

• Journal of the Japan Society of Powder and Powder Metallurgy (ISSN: 05328799) vol. 72 issue. 1 p. 10-15 24-00037

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2497/jjspm.24-00037

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Updated at: 2025-12-10 08:30:33 +0900

Published on MDR: 2025-12-10 08:23:51 +0900