Preparation and Physical Properties of <i>R</i>(Al, Mn)B<sub>4</sub> (<i>R</i> = Gd ~ Lu) Compounds

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  • KOUZU Kaoru
    Dept. of Science and Engineering, Kokushikan University
  • OKADA Shigeru
    Research Institute for Engineering, Kanagawa University
  • HAGIWARA Takeshi
    Research Institute for Engineering, Kanagawa University
  • NOMURA Akiko
    Institute for Materials Research, Tohoku University
  • SHISHIDO Toetsu
    Institute for Materials Research, Tohoku University
  • YOSHIKAWA Akira
    Institute for Materials Research, Tohoku University
  • YUBUTA Kunio
    Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu University
  • BOURGÈS Cédric
    International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS)
  • MORI Takao
    International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)

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Other Title
  • <i>R</i>(Al, Mn)B<sub>4</sub> (<i>R</i> = Gd ~ Lu)化合物の生成と物理的性質
  • R(Al, Mn)B₄(R = Gd ~ Lu)化合物の生成と物理的性質
  • R(Al, Mn)B ₄(R = Gd ~ Lu)カゴウブツ ノ セイセイ ト ブツリテキ セイシツ

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Abstract

<p>Crystals of the new solid compounds Tm(Al1-xMnx)B4 (x = 0.002 ~ 0.100) and R(Al0.995Mn0.005)B4 (R = rare earth), were grown from R2O3 and crystalline B powders for Al and Mn mixed flux. Mixture of the starting materials was heated up to1773 K in an Ar atmosphere and kept at that temperature for 5 h, then the molten flux solution was slowly cooled down at a rate of 50 K/h. Tm(Al1-xMnx)B4 compounds were obtained as a single phase from the Al1-xMnx flux (x = 0.005 ~ 0.100). R(Al0.995Mn0.005)B4 compounds were obtained as in the case of R(Ho, Er, Tm, Yb, Lu). ThB4-type compounds were formed in the case of R (Gd, Tb, Dy, Ho). The lattice constants of Ho(Al, Mn)B4 and Lu(Al, Mn)B4 obtained were in the range of a = 3.475(1), b = 5.932(1), c = 11.465(1) Å and a = 3.434(1), b = 5.895(1), c = 11.391(1) Å. The lattice constants were smaller than those of RAlB4 by dissolving Mn atom into Al atom. The values of the hardness for R(Al, Mn)B4 were in the range of 11.9 ~ 13.7 GPa. The magnetic susceptibilities of both Er(Al0.995Mn0.005)B4 and Yb(Al0.995Mn0.005)B4 show antiferromagnetic transitions at 3.5 K and 12 K, respectively.</p>

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