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

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, S. Kohiki, Y. KawazoeK. Nakajima

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8 Citations (Scopus)

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 ≤ 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.

Original languageEnglish
Pages (from-to)304-307
Number of pages4
JournalJournal of Alloys and Compounds
Volume426
Issue number1-2
DOIs
Publication statusPublished - 2006 Dec 21

Keywords

  • CeRhB
  • Hardness
  • Nonstoichiometry
  • Oxidation resistance
  • Perovskite-type compound

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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