Boron nonstoichiometry, hardness and oxidation resistance of perovskite-type CeRh3Bx (x=0-1)

We report synthesis of perovskite-type boride CeRh3Bx using the arc melting method. The samples are characterized by powder X-ray diffraction which shows that the crystal structure of CeRh3Bx belongs to the cubic system (space group: Pm3m) in the range of 0 < x < or = 1. Furthermore, CeRh3 (x=...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-12, Vol.426 (1-2), p.304-307
Main Authors: SHISHIDO, T, OKU, M, OBARA, K, SAHARA, R, YUBUTA, K, KOJIMA, H, KUMAR, V, TANAKA, M, SHIMAMURA, K, OISHI, S, KOHIKI, S, KAWAZOE, Y, YE, J, NAKAJIMA, K, OKADA, S, KUDOU, K, IIZUMI, K, SAWADA, Y, ISHIZAWA, Y, NOMURA, A, SUGAWARA, T
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Inorganic compounds
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Surface treatments
Tribology and hardness
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Summary:We report synthesis of perovskite-type boride CeRh3Bx using the arc melting method. The samples are characterized by powder X-ray diffraction which shows that the crystal structure of CeRh3Bx belongs to the cubic system (space group: Pm3m) in the range of 0 < x < or = 1. Furthermore, CeRh3 (x=0) has the ordered AuCu3-type structure (space group: Pm3m). As a result, CeRh3Bx exists in a wide range of nonstoichiometric boron concentration 0 < or = x < or = 1 with the space group Pm3m. The lattice parameter, a, changes almost linearly with x, varying from 0.4015(1) nm (x=0) to 0.4180(1) nm (x= 1.0). The micro-Vickers hardness of the CeRh3Bx for x=0 (0at.%B), 0.210 (5 at.%B), 0.444 (10at.%B), 0.706 (15 at.%B) and 1.0 (20at.%B) are 2.0plus/minus 0.1, 4.3 plus/minus 0.2, 1.8 plus/minus 0.2, 5.5 plus/minus 0.1 and 6.5 plus/minus 0.2 GPa, respectively. Thermo-gravimetric analysis was done to study the oxidation resistance of the samples in air. It reveals that oxidation begins at 502 and 513Kfor x=0 and 1.0, respectively. A mixed phase of CeO2 + Rh is identified as an oxidized product for all samples.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2006.01.102