Synthesis and High-Temperature Heat Capacity of Dy2Ge2O7 and Ho2Ge2O7
- 作者: Denisova L.T.1, Irtyugo L.A.1, Kargin Y.F.2, Belousova N.V.1, Beletskii V.V.1, Denisov V.M.1
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隶属关系:
- Institute of Nonferrous Metals and Materials Science
- Baikov Institute of Metallurgy and Materials Science
- 期: 卷 54, 编号 4 (2018)
- 页面: 361-365
- 栏目: Article
- URL: https://journals.rcsi.science/0020-1685/article/view/158436
- DOI: https://doi.org/10.1134/S0020168518040039
- ID: 158436
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详细
The Dy2Ge2O7 and Ho2Ge2O7 pyrogermanates have been prepared by solid-state reactions in several sequential firing steps in the temperature range 1237–1473 K using stoichiometric mixtures of Dy2O3 (or Ho2O3) and GeO2. The heat capacity of the synthesized germanates has been determined as a function of temperature by differential scanning calorimetry in the range 350–1000 K. The experimentally determined Cp(T) curves of the dysprosium and holmium germanates have no anomalies and are well represented by the Maier–Kelley equation. The experimental Cp(T) data have been used to evaluate the thermodynamic functions of the Dy2Ge2O7 and Ho2Ge2O7 pyrogermanates: enthalpy increment H°(T)–H°(350 K), entropy change S°(T)–S°(350 K), and reduced Gibbs energy Ф°(T).
作者简介
L. Denisova
Institute of Nonferrous Metals and Materials Science
编辑信件的主要联系方式.
Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041
L. Irtyugo
Institute of Nonferrous Metals and Materials Science
Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041
Yu. Kargin
Baikov Institute of Metallurgy and Materials Science
Email: antluba@mail.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334
N. Belousova
Institute of Nonferrous Metals and Materials Science
Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041
V. Beletskii
Institute of Nonferrous Metals and Materials Science
Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041
V. Denisov
Institute of Nonferrous Metals and Materials Science
Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041
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