Systematic Study on Crystal Structures in Tetragonal RB<sub>2</sub>C<sub>2</sub> (R=Rare Earth) Compounds

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  • Ohoyama Kenji
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Kaneko Koji
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Indoh Kentaro
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Yamauchi Hiroki
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Tobo Aya
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Onodera Hideya
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Yamaguchi Yasuo
    Institute for Materials Research, Tohoku University, Sendai 980-8577

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タイトル別名
  • Systematic Study on Crystal Structures in Tetragonal RB2C2 (R=Rare Earth) Compounds.

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抄録

Detailed crystal structures of the tetragonal RB2C2 (R=La, Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm and Lu) compounds which include the antiferroquadrupolar ordering materials, DyB2C2 and HoB2C2, have been investigated by neutron powder diffraction technique. RB2C2 are crystallised in the same LaB2C2 type crystal structure with P4/mbm symmetry. The structure of the B-C network which consists of non-regular squares and octagons are nearly the same in the system except slight rotation as rare earth atoms become heavier.

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