Hardness and oxidation resistance of nonstoichiometric ErRh3Bx-perovskite

Toetsu Shishido, Kunio Kudou, Shigeru Okada, Y. E. Jinhua, Akira Yoshikawa, Kazuo Obara, Takamasa Sugawara, Hiroyuki Horiuchi, Tsuguo Fukuda

Research output: Contribution to journalArticlepeer-review


Polycrystals of ErRh3Bx: are synthesized by arc melting. The compounds of ErRh3Bx have a perovskite-type cubic structure (space group: Pm3̄m). The nonstoichiometric phase exists for the boron content from x= 1.000 (20 mol% B) to 0.61 (13.3 mol% B). The lattice parameter of a depends on x, and varies linearly from a = 0.4151 nm (x= 1.000) to 0.4063 nm (x=0.61). The micro-Vickers hardness of the ErRh3Bx compaunds increases with increasing their B content. The hardness of ErRh3B1.000 (20 mol% B) sample is 8.6±0.3 GPa. The thermo gravimetric curve indicates that the onset-temperature of oxidation for ErRh3B1.000 is 1303 K. The weight gain of ErRh3B1.000 during heating in air to 1473 K is 0.7%.

Original languageEnglish
Pages (from-to)1011-1015
Number of pages5
JournalJournal of the Ceramic Society of Japan
Issue number11
Publication statusPublished - 2000


  • Micro-vickers hardness
  • Perovskite-type compound
  • TG-DTA


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