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Abstract <p>The Rb<sub>3</sub>Ln<sub>3</sub>Zn<sub>2</sub>S<sub>8</sub> (Ln&#xa0;=&#xa0;Eu, Gd, Ho) and Cs<sub>0.88</sub>Rb<sub>2.12</sub>Tb<sub>3</sub>Zn<sub>2</sub>S<sub>8</sub> layered compounds are prepared for the first time by a reaction of the corresponding lanthanide sulfides with zinc sulfide, rubidium polysulfide, using RbCl as a flux. The synthesized compounds crystallize in the monoclinic space group <i>C</i>2/<i>m</i>. Their crystal structure can be described as a combination of motifs characteristic of KZrCuS<sub>3</sub> and α-NaFeO<sub>2</sub> structure types. The optical band gaps determined by the Kubelka–Munk method are 1.90&#xa0;eV (Eu), 3.54&#xa0;eV (Gd), 3.55&#xa0;eV (Tb), and 3.42&#xa0;eV (Ho).</p>

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Synthesis, Structural Model, and Optical Properties of Rb3Ln3Zn2S8 (Ln = Eu, Gd, Ho) and Cs0.88Rb2.12Tb3Zn2S8

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • S. -J. Park,
  • T. A. Pomelova,
  • N. V. Kuratieva,
  • I. Y. Filatova,
  • N. G. Naumov

摘要

Abstract

The Rb3Ln3Zn2S8 (Ln = Eu, Gd, Ho) and Cs0.88Rb2.12Tb3Zn2S8 layered compounds are prepared for the first time by a reaction of the corresponding lanthanide sulfides with zinc sulfide, rubidium polysulfide, using RbCl as a flux. The synthesized compounds crystallize in the monoclinic space group C2/m. Their crystal structure can be described as a combination of motifs characteristic of KZrCuS3 and α-NaFeO2 structure types. The optical band gaps determined by the Kubelka–Munk method are 1.90 eV (Eu), 3.54 eV (Gd), 3.55 eV (Tb), and 3.42 eV (Ho).