Abstract
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 language | English |
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Pages (from-to) | 129-134 |
Number of pages | 6 |
Journal | Journal of Solid State Chemistry |
Volume | 161 |
Issue number | 1 |
DOIs | |
State | Published - 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.
Keywords
- Band gap
- Crystal structure
- Disulfide ion
- NaGdSbS
- Thioantimonate