Synthesis and Thermodynamic Study of CaYb2Ge4O12 and CaLu2Ge4O12 Germanates in the Range 320–1050 K

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Russian Journal of Inorganic Chemistry Pub Date : 2024-09-15 DOI:10.1134/s0036023624601958

L. T. Denisova, D. V. Belokopytova, Yu. F. Kargin, G. V. Vasil’ev, N. V. Belousova, V. M. Denisov

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Abstract

Germanates CaYb₂Ge₄O₁₂ and CaLu₂Ge₄O₁₂ have been prepared via firing the solid precursor oxides CaO, Yb₂O₃ (Lu₂O₃), and GeO₂ in air at 1223–1423 K. The X-ray diffraction crystal structures of the prepared germanates have been determined. The high-temperature heat capacity in the range 320–1050 K has been measured by differential scanning calorimetry (DSC). The measured heat capacities are well fitted by the Maier–Kelley equation: C_p(CaYb₂Ge₄O₁₂) = \(\left( {{{416}}{{.4\; \pm \;0}}{{.40}}} \right) + \left( {{{72}}{{.67\; \pm \;2}}{{.30}}} \right){{ \times 1}}{{{{0}}}^{{{{-3}}}}}T - \left( {{{50}}{{.13\; \pm \;0}}{{.19}}} \right){{ \times 1}}{{{{0}}}^{{{5}}}}{{T}^{{{{-2}}}}}\), and C_p(CaLu₂Ge₄O₁₂) = \(\left( {{{450}}{{.0\; \pm \;1}}{{.75}}} \right) + \left( {{{15}}{{.46\; \pm \;1}}{{.90}}} \right){{ \times 1}}{{{{0}}}^{{{{-3}}}}}T - \left( {{{78}}{{.67\; \pm \;1}}{{.60}}} \right){{ \times 1}}{{{{0}}}^{{{5}}}}{{T}^{{{{-2}}}}}\). These results have been used to calculate selected thermodynamic properties of the prepared germanates.

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320-1050 K 范围内 CaYb2Ge4O12 和 CaLu2Ge4O12 锗酸盐的合成与热力学研究

摘要通过在 1223-1423 K 的空气中焙烧固体前体氧化物 CaO、Yb2O3 (Lu2O3) 和 GeO2，制备了锗酸盐 CaYb2Ge4O12 和 CaLu2Ge4O12。通过差示扫描量热法（DSC）测量了 320-1050 K 范围内的高温热容量。测得的热容量与 Maier-Kelley 方程十分吻合：Cp(CaYb2Ge4O12) = \left( {{{416}}{{.4\; \pm \;0}}{{.40}} \right) + \left( {{{72}}{{.67\; \pm \;2}}{{.30}} \right){{ \times 1}}{{{{0}}^{{{{-3}}}}}T - \left( {{{50}}{{.13; \pm \;0}}{{.19}}} \right){{ \times 1}}{{{{0}}}^{{5}}}}{{T}^{{{{-2}}}}}\), and Cp(CaLu2Ge4O12) =\(\left( {{450}}{.0; \pm \;1}}{{.75}} \right) + \left( {{{15}}{{.46\; \pm \;1}}{{.90}} \right){{ \times 1}{{{{0}}}^{{{{-3}}}}}T - \left( {{{78}}{.67; \pm\;1}}{{.60}} \right){{ \times 1}}{{{{0}}}^{{5}}}}{T}^{{{{-2}}}}}\).这些结果被用来计算所制备的锗酸盐的部分热力学性质。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

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.