Synthesis and crystal structure of a new quaternary thioantimonate, Na9Gd5Sb8S26

Sunju Park, Sung Jin Kim

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24 Scopus citations


The first Na-containing quaternary rare-earth thioantimonate, Na9Gd5Sb8S26, was synthesized from the reaction of Gd metal, Sb, and S in Na2S flux at 750°C. Black plate-shaped crystals were obtained and their crystal structure was determined by the single-crystal X-ray diffraction method. This compound crystallizes in the orthorhombic space group Pnma (No. 62) with a unit cell of a = 11.406(3) Å, b = 23.765(2) Å, c = 16.923(5) Å, and Z = 4. Na9Gd5Sb8S26 has a complex three-dimensional structure that consists of SbS3, SbS4, GdS6, and GdS7 units. In the structure, three crystallographically different Gd atoms form a staircase-shaped building block, where two Gd atoms share disulfide ions, S22-. The formula of the compound can be described as (Na+)9(Gd3+)5(Sb3+) 8(S2-)22(S22-) 2. Measurement of the optically diffuse reflectance indicates that Na9Gd5Sb8S26 is a semiconductor with a band gap of 1.63 eV.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalJournal of Solid State Chemistry
Issue number1
StatePublished - 2001

Bibliographical note

Funding Information:
The authors express their thanks to Prof. Y. B. Park for permitting the use of the Shimadzu UV-3101PC spectrophotometer. This work is supported by Grant 2000-1-12200-002-3 from the Basic Research Program of the Korean Science & Engineering Foundation.


  • Band gap
  • Crystal structure
  • Disulfide ion
  • NaGdSbS
  • Thioantimonate


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