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<p>Two new perovskite-type compounds, Na<sub>4</sub>Cu<sub>8</sub>Sn<sub>3</sub>S<sub>12</sub> (<b>1</b>) and K<sub>4</sub>Cu<sub>8</sub>Sn<sub>3</sub>S<sub>12</sub> (<b>2</b>) were synthesized by a solvothermal method in the existence of excess sulfur as a mineralizer. Two compounds are isostructural and crystallize in cubic space group <i>Fm</i><InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10876_2025_2896_Article_IEq1.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:\stackrel{-}{3}\)</EquationSource> </InlineEquation><i>c</i> and feature the same anion framework [Cu<sub>8</sub>Sn<sub>3</sub>S<sub>12</sub>]<sub>n</sub><sup>4n−</sup>. Compared with perovskite CaTiO<sub>3</sub>, the Ti⁴⁺ ions are simultaneously substituted by [Cu₈]⁸⁺ unit, the O²⁻ ions by [SnS₄]⁴⁻ unit, and the Ca²⁺ ions by four alkali metal cations. The above compounds are narrow-band semiconductors with the band gaps of 2.01&#xa0;eV for compound <b>1</b>, and 2.25&#xa0;eV for <b>2</b>, and compound <b>1</b> exhibits good photoelectric response performance.</p> Graphical Abstract <p></p>

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Syntheses, Structures, and Characterizations of Two Superatom-Based Cubic Perovskites 

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Yan Liu,
  • Ruibing Wang,
  • Wei Zhang,
  • Yu Zhong,
  • Changyan Yu,
  • Yanhua Li

摘要

Two new perovskite-type compounds, Na4Cu8Sn3S12 (1) and K4Cu8Sn3S12 (2) were synthesized by a solvothermal method in the existence of excess sulfur as a mineralizer. Two compounds are isostructural and crystallize in cubic space group Fm \(\:\stackrel{-}{3}\) c and feature the same anion framework [Cu8Sn3S12]n4n−. Compared with perovskite CaTiO3, the Ti⁴⁺ ions are simultaneously substituted by [Cu₈]⁸⁺ unit, the O²⁻ ions by [SnS₄]⁴⁻ unit, and the Ca²⁺ ions by four alkali metal cations. The above compounds are narrow-band semiconductors with the band gaps of 2.01 eV for compound 1, and 2.25 eV for 2, and compound 1 exhibits good photoelectric response performance.

Graphical Abstract