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Synthesis and Crystal Structure of a New Quaternary Thioantimonate, Na9Gd5Sb8S26

✍ Scribed by Sunju Park; Sung-Jin Kim

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 332 KB
Volume: 161
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9299

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✦ Synopsis

The 5rst Na-containing quaternary rare-earth thioantimonate, Na 9 Gd 5 Sb 8 S 26 , was synthesized from the reaction of Gd metal, Sb, and S in Na 2 S 6ux at 7503C. Black plate-shaped crystals were obtained and their crystal structure was determined by the single-crystal X-ray di4raction method. This compound crystallizes in the orthorhombic space group Pnma (No. 62) with a unit cell of a ‫؍‬ 11.406(3) A s , b ‫؍‬ 23.765(2) A s , c ‫؍‬ 16.923(5) A s , and Z ‫؍‬ 4. Na 9 Gd 5 Sb 8 S 26 has a complex three-dimensional structure that consists of SbS 3 , SbS 4 , GdS 6 , and GdS 7 units. In the structure, three crystallographically di4erent Gd atoms form a staircase-shaped building block, where two Gd atoms share disul5de ions, S 2؊ 2 . The formula of the compound can be described as (Na ؉ ) 9 (Gd 3؉ ) 5 (Sb 3؉ ) 8 (S 2؊ ) 22 (S 2؊

2 ) 2 . Measurement of the optically di4use re6ectance indicates that Na 9 Gd 5 Sb 8 S 26 is a semiconductor with a band gap of 1.63 eV.

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