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<p>The synthesis, structure, and magnetic properties of Ba<sub>3</sub>REB<sub>9</sub>O<sub>18</sub> (RE = Dy-Yb) compounds were investigated. Rietveld Refinement of the X-ray diffraction (XRD) data confirms that all compounds crystallize in a hexagonal Ba<sub>3</sub>YB<sub>9</sub>O<sub>18</sub>-type structure with space group <i>P</i>6<sub>3</sub>/m (No. 176) and Pearson symbol <i>hP</i>62. The lattice parameters <i>a</i> and <i>c</i> increase linearly with the increasing ionic radii of the RE<sup>3+</sup> ions. RE<sup>3+</sup> ions form two-dimensional triangular layers in the <i>ab</i> plane, which are separated by non-magnetic Ba/B-O polyhedra. The magnetic susceptibility measurement reveals no long-range magnetic order or spin glass behavior in any of the compounds above 2&#xa0;K. The negative Curie-Weiss temperatures indicate dominant antiferromagnetic (AFM) exchange interactions between the RE<sup>3+</sup> ions. The combination of triangular lattice and antiferromagnetic interaction suggests this family of compounds is a promising system for researching magnetic frustration.</p>

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Synthesis, Structure, Magnetism of Two-Dimensional Triangular Lattice Materials Ba3REB9O18 (RE = Dy, Ho, Er, Tm and Yb)

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Wanxia Liu,
  • Yuxia Gao,
  • Yaning Li,
  • Yulong Li,
  • Weijie Ren,
  • Xin Sun,
  • Xiaofeng Li,
  • Mingli Wang

摘要

The synthesis, structure, and magnetic properties of Ba3REB9O18 (RE = Dy-Yb) compounds were investigated. Rietveld Refinement of the X-ray diffraction (XRD) data confirms that all compounds crystallize in a hexagonal Ba3YB9O18-type structure with space group P63/m (No. 176) and Pearson symbol hP62. The lattice parameters a and c increase linearly with the increasing ionic radii of the RE3+ ions. RE3+ ions form two-dimensional triangular layers in the ab plane, which are separated by non-magnetic Ba/B-O polyhedra. The magnetic susceptibility measurement reveals no long-range magnetic order or spin glass behavior in any of the compounds above 2 K. The negative Curie-Weiss temperatures indicate dominant antiferromagnetic (AFM) exchange interactions between the RE3+ ions. The combination of triangular lattice and antiferromagnetic interaction suggests this family of compounds is a promising system for researching magnetic frustration.