Syntheses and properties of Yb(Al1-xTx)B4 (T = Cr, Fe) compounds

Kaoru Kouzu, Takashi Yamasaki, Shigeru Okada, Takao Mori, Quansheng Guo, Kunio Yubuta, Akiko Nomura, Toetsu Shishido, Akira Yoshikawa, Peter Rogl

Research output: Contribution to journalArticlepeer-review

Abstract

Crystals of new compounds α-Yb(Al1-xTx)B4 (orthorhombic, space group Pbam) (T = Fe, x = 0∼0.100; T = Cr, x = 0∼0.015) with YCrB4-type were grown from Yb2O3, metal Fe or Cr and crystalline boron powders under an Ar atmosphere at 1773 K for 5 h. The obtained Yb(Al1-xTx)B4 crystals were measured for hardness and magnetic susceptibility. The values of micro-Vickers hardness for Yb(Al1-xFex)B4 and Yb(Al1-xCrx)B4 were in the range of 15.7(1.5)∼16.8(1.5) GPa, and 13.3(2.7)∼14.8(1.5) GPa, respectively. It is presumed that this difference is due to the difference in the size of the atomic radius of Fe or Cr. The magnetic susceptibility of Yb(Al0.995Fe0.005)B4 shows a sharp paramagnetic increase at low temperatures, likely due to impurities or defects.

Original languageEnglish
Pages (from-to)525-529
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume66
Issue number11
DOIs
Publication statusPublished - 2019

Keywords

  • Al-self flux
  • Chemical analysis
  • Lattice constant
  • Magnetic susceptibility
  • Micro-Vickers hardness
  • Solid solutions Yb(AlT)B (T = Fe, Cr)

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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