Syntheses, crystal structures and vibrational properties of Rb₄Si₄S₁₀ and Rb₄Si₄Se₁₀

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• 作者：Kö ; ster ; Christian ; Lindemann ; Arno ; Kuchinke ; Joachim ; Mü ; ck-Lichtenfeld ; Christian ; et. al.
• 关键词：Chalcogenosilicates ; Crystal structure ; Ab initio calculations
• 刊名：Solid State Sciences
• 出版年：2002
• 出版时间：April, 2002
• 年：2002
• 卷：4
• 期：5
• 页码：641-650
• 全文大小：293 K

文摘

The new thiosilicate Rb₄Si₄S₁₀ (C2/c, a=15.106(4), b=15.164(2), c=9.031(1) Å, β=105.67(3)°, Z=4) was prepared from rubidium sulfide, silicon and sulfur in solid state reactions at 800°C. In a similar way crystals of Rb₄Si₄Se₁₀ (C2/c, a=15.846(3), b=15.872(3), c=9.325(2) Å, β=105.63(3)°, Z=4) were obtained from reactions at 800°C using rubidium selenide, silicon and selenium as starting materials. Structural data for the two isotypic phases were obtained from single crystal X-ray diffraction. These novel nonoxidic rubidium chalcogenosilicates contain isolated adamantane-analogous Si₄Q⁴⁻₁₀-anions (Q