Structural and Vibrational Study of K2SeO4·Te(OH)6 Material

✍ Scribed by M. Dammak; H. Khemakhem; T. Mhiri; A.W. Kolsi; A. Daoud

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 253 KB
• Volume: 145
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8254

✦ Synopsis

At room temperature, the new compound K 2 SeO 4 ' Te(OH) 6 was synthesized from water solutions of H 6 TeO 6 /K 2 SeO 4 . The potassium selenate tellurate (KTSe), M m "480.81 g, possesses a monoclinic structure with Cc space group. The crystal and re5nement cell parameters are: a ‫؍‬ 11.552(2) A s , b ‫؍‬ 6.432(1) A s , c ‫؍‬ 13.919(2) A s , ‫؍‬ 105.92(1), V ‫؍‬ 994.5(3) A s 3 , Z ‫؍‬ 4, D x ‫؍‬ 3.011 g/cm 3 , and F(000) ‫؍‬ 840. The residuals are R1 ‫؍‬ 0.023 and WR2‫؍‬ 0.069 for 1139 observed re6ections (1108 with I >2 (I)) re5ned with 152 parameters. The main interest of this structure is the presence of two di4erent and independent anionic groups (TeO 6؊ 6 and SeO 2؊ 4 ) in the same crystal. Raman and IR spectra of K SeO 4 ' Te(OH) 6 , recorded at room temperature in the frequency range 200+4000 cm ؊1 , show that both SeO 2؊ 4 and TeO 6؊ 6 groups coexist in the crystal independently.