Preparation, characterization and thermodynamic stability of Rh₃Te₂O₁₀

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• 作者：R. Mishra ; S.R. Bharadwaj ; D. Das ; Martin Valldor and Rainer Pö ; ttgen
• 刊名：Journal of Nuclear Materials
• 出版年：2006
• 出版时间：15 October 2006
• 年：2006
• 卷：357
• 期：1-3
• 页码：183-190
• 全文大小：318 K

文摘

A new ternary compound Rh₃Te₂O₁₀ was synthesized by reacting Rh₂O₃ and TeO₂ under 1 bar oxygen at 950 K. The compound was characterized by TG-DTA, XRD, EDX and magnetic susceptability analyses. From the TG experiment, the formation reaction could be expressed as 6Rh₂O₃(s) + 8TeO₂(s) + 3O₂(g) = 4Rh₃Te₂O₁₀(s). Rh₃Te₂O₁₀ crystallizes with a rutile type structure, a = 456.6(2), c = 385.9(1) pm, space group P4₂/mnm (No. 136). The thermodynamic stability of the compound was determined by measuring the vapor pressure of TeO₂(g). The vapor pressure over the two-phase mixture of Rh₂O₃ and Rh₃Te₂O₁₀ is given by the relation ln p(TeO₂)/Pa (±0.07) = −36138.9 · T⁻¹ + 35.3, 915 T/K 985. The Gibbs energy of formation of the compound derived using the above vapor pressure data can be expressed as Δ_fG°(Rh₃Te₂O₁₀, s) (±7.0 kJ mol⁻¹) = −1510.3 + 0.897 T, 915 T/K 985.