Critical Experiments and Thermodynamic Modeling of the Li2O-SiO2 System

被引:2
作者
de Abreu, Danilo Alencar [1 ]
Fabrichnaya, Olga [1 ]
机构
[1] Tech Univ Bergakad Freiberg, Inst Geowissensch, Gustav Zeuner Str 5, D-09599 Freiberg, Sachsen, Germany
来源
SOLIDS | 2024年 / 5卷 / 02期
关键词
Li2O-SiO2; system; Li recycling; phase diagram; thermodynamic modeling; PHASE-EQUILIBRIA; LITHIUM METASILICATE; 2-SUBLATTICE MODEL; HEAT-CAPACITIES; ION BATTERIES; TEMPERATURE; ENTHALPY; DIAGRAMS; LI4SIO4; VAPORIZATION;
D O I
10.3390/solids5020020
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Phase equilibria studies were performed in the Li2O-SiO2 system for heat-treated samples using Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD). The temperature of the eutectic reaction (Liq (sic) Li4SiO4 + Li2SiO3) was experimentally determined at 1289 K using Differential Thermal Analysis (DTA). No evidences of the Li6Si2O7 formation was found by the experimental investigation and therefore, it was not considered. Heat capacity of the Li8SiO6 phase was measured using Differential Scanning Calorimetry (DSC). Solid phases of the Li2O-SiO2 system were described as stoichiometric compounds and liquid phases by two-sublattice partially ionic liquid model. Four stoichiometric intermediate compounds were considered to be stable (Li8SiO6, Li4SiO4, Li2SiO3 and Li2Si2O5). The polymorphic transformation in Li2Si2O5 phase was accounted and the metastable liquid miscibility gap on SiO2-rich side was reproduced. The calculated phase diagram satisfactorily agrees with the experimental phase equilibria as well as calculated thermodynamic properties reproduces experimental values within uncertainty limits.
引用
收藏
页码:303 / 320
页数:18
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