Premium
Coupled experimental phase diagram study and thermodynamic optimization of the Li 2 O–MgO–SiO 2 system
Author(s) -
Konar Bikram,
Kim DongGeun,
Jung InHo
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15293
Subject(s) - phase diagram , calphad , thermodynamics , differential scanning calorimetry , gibbs free energy , phase (matter) , materials science , quenching (fluorescence) , analytical chemistry (journal) , chemistry , fluorescence , physics , organic chemistry , chromatography , quantum mechanics
A coupled key phase diagram study and critical evaluation and optimization of all available experimental data of the Li 2 O–MgO–SiO 2 system was performed to obtain a set of Gibbs energy functions to reproduce all the reliable phase equilibria and thermodynamic data. Differential scanning calorimetry measurements and equilibration/quenching experiments were performed in the Li 2 SiO 3 –MgO and Li 4 SiO 4 –Mg 2 SiO 4 sections, respectively, using sealed Pt capsules to prevent the volatile loss of Li. According to the present experimental results, Li 2 MgSiO 4 is the only compound present in the Li 4 SiO 4 –Mg 2 SiO 4 isopleth, which shows a peritectic melting at 1465 ± 6°C (1738 ± 6 K). The Modified Quasichemical Model, which considers short‐range ordering in the melt, was employed to describe the thermodynamic properties of the liquid phase. The Li 4 SiO 4 –Li 2 MgSiO 4 and Mg 2 SiO 4 ‐rich solid solutions were modeled using the Compound Energy Formalism.