M. A. Ryumin, A. V. Tyurin, A. V. Khoroshilov, G. E. Nikiforova, K. S. Gavrichev
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引用次数: 0
摘要
摘要 利用固态反应合成了具有热长石结构的锡酸镥。采用绝热法和差示扫描量热法测量了多晶 Lu2Sn2O7 在 7.99-1871 K 温度范围内的热容量。根据平滑热容数据计算了熵、焓变和衍生吉布斯能。利用这项工作中获得的 ΔfS°(Т) 值和文献中已知的 ΔfH°(Т) 值，估算了元素锡酸镥的吉布斯自由能。高温 X 射线衍射测定了立方晶格参数的温度依赖性以及 300-1273 K 温度范围内的热膨胀系数值。
Thermodynamic Properties of Lutetium Stannate Lu2Sn2O7 in the Temperature Range of 0–1871 K
Abstract
Lutetium stannate with a pyrochlore structure was synthesized using solid state reaction. The heat capacity of polycrystalline Lu2Sn2O7 in the temperature range of 7.99–1871 K was measured by adiabatic and differential scanning calorimetry methods. Entropy, enthalpy change, and derived Gibbs energy were calculated from the smoothed heat capacity data. The Gibbs free energy of Lutetium stannate from elements was estimated, using the ΔfS°(Т) values obtained in this work and the ΔfH°(Т) values known from the literature. The temperature dependence of the cubic crystal lattice parameter and the value of the coefficient of thermal expansion in the temperature range of 300–1273 K were determined by high-temperature X-ray diffraction.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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