TY - JOUR
T1 - Boron nonstoichiometry, hardness and oxidation resistance of perovskite-type CeRh3Bx (x = 0-1)
AU - Shishido, T.
AU - Oku, M.
AU - Ye, J.
AU - Okada, S.
AU - Kudou, K.
AU - Iizumi, K.
AU - Sawada, Y.
AU - Ishizawa, Y.
AU - Nomura, A.
AU - Sugawara, T.
AU - Obara, K.
AU - Sahara, R.
AU - Yubuta, K.
AU - Kojima, H.
AU - Kumar, V.
AU - Tanaka, M.
AU - Shimamura, K.
AU - Oishi, S.
AU - Kohiki, S.
AU - Kawazoe, Y.
AU - Nakajima, K.
PY - 2006/12/21
Y1 - 2006/12/21
N2 - 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 ≤ 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 ≤ x ≤ 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.
AB - 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 ≤ 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 ≤ x ≤ 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.
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U2 - 10.1016/j.jallcom.2006.01.102
DO - 10.1016/j.jallcom.2006.01.102
M3 - Article
AN - SCOPUS:33751005011
SN - 0925-8388
VL - 426
SP - 304
EP - 307
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -