Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1626818 | Journal of Alloys and Compounds | 2006 | 4 Pages |
Abstract
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 â¤Â 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 â¤Â x â¤Â 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 (0 at.%B), 0.210 (5 at.%B), 0.444 (10 at.%B), 0.706 (15 at.%B) and 1.0 (20 at.%B) are 2.0 ± 0.1, 4.3 ± 0.2, 1.8 ± 0.2, 5.5 ± 0.1 and 6.5 ± 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 513 K for x = 0 and 1.0, respectively. A mixed phase of CeO2 + Rh is identified as an oxidized product for all samples.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
T. Shishido, M. Oku, J. Ye, S. Okada, K. Kudou, K. Iizumi, Y. Sawada, Y. Ishizawa, A. Nomura, T. Sugawara, K. Obara, R. Sahara, K. Yubuta, H. Kojima, V. Kumar, M. Tanaka, K. Shimamura, S. Oishi, K. Nakajima,