Nonstoichiometric perovskite type-GdRh3Bx compound and it's relation of boron content to hardness and oxidation resistance

Toetsu Shishido, Jinhua Ye, Shigeru Okada, Kunio Kudou, Hiroshi Yamauchi, Akira Yoshikawa, Kazuo Obara, Takamasa Sugawara, Tsuguo Fukuda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Polycrystalline samples of GdRh3Bx, which consists of highly reactive (Gd) and high melting (Rh, B) elements, have been successfully synthesized by arc melting method. Extreme evaporation of the constituent elements has not been observed. Compound of GdRh3Bx has perovskite type cubic structure (space group: Pm3m). Perovskite-type GdRh3Bx exists in the range of x=1.000 (20 atom% B) and 0.444 (10 atom% B). Lattice parameter of α in annealed GdRh3Bx depends on x, and varies lineary from α=0.41831 (6)nm (x=1.000) to 0.4121(1) nm (x=0.444). The TG curve indicates that the onset-temperature of oxidation for GdRh3B1.000 is 567.3 °C and for GdRh3B0.706 is 611.3 °C, respectively. Weight gain by heating in air up to 1200°C for GdRh3B1.000 (20 atom% B) is 6.83% and for GdRh3B0.706 (15 atom% B) is 8.61%, respectively. The former value for stoichiometric compound is smaller than the latter. Both samples decompose to GdBO3 and Rh after oxidation. The micro-Vickers hardness of the annealed GdRh3Bx increases with increasing B content in the range of x=1.333-0.444, for example hardness of the annealed GdRh3B1.000 (20 atom%B) is 4.2(± 0.10) GPa.

Original languageEnglish
Pages (from-to)106-111
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume106
Issue number1
DOIs
Publication statusPublished - 1998 Jan

Keywords

  • GdRhB
  • Hardness
  • Oxidation-resistivity
  • Perovskite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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