Experimental determination of phase equilibria in the CaO-BaO-SiO 2 -12 mol pct. Al 2 O 3 -13 mol pct. MgO system at 1573 K and 1623 K

Zhanjun Wang, Il Sohn

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Abstract

Phase equilibria of the CaO-BaO-SiO 2 -12mol pct. Al 2 O 3 -13mol pct. MgO system with a wide substitution range of CaO with BaO have been experimentally determined at 1623 K (1350°C) and 1573 K (1300°C) using high-temperature equilibration followed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA) analysis. The (Ca,Ba) 3 MgSi 2 O 8 , BaAl 2 O 4 , BaAl 2 Si 2 O 8 and Ca 2 (Al 0.46 Mg 0.54 )(Al 0.46 Si 1.54 )O 7 phases have been designated within the phase diagram. The liquidus temperature initially decreased and then increased for the samples substituting CaO with BaO at a constant (C + B)/S ratio between 1.50 and 1.86. For samples with a constant BaO/CaO ratio, the liquidus temperature showed similar trends with a lower (C + B)/S ratio from 1.22 to 0.67. The volume fraction of crystal phases of the samples as-quenched from 1573 K (1300°C) correlated well with the variation of liquidus and the primary phases. In addition, the change in the Gibbs free energy of the reactions and the bond parameter (X p  × Z/R k ) of the cations were analyzed, where the maximum change in the Gibbs free energy was found for the formation of Ca 3 MgSi 2 O 8 ; furthermore, the stronger basic tendency of Ba 2+ than Ca 2+ facilitates Ba 2+ substitution for Ca 2+ and bonding with acidic tendency cations to form Ba-containing phases.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusPublished - 2019 Jan 1

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Phase equilibria
Gibbs free energy
Cations
Substitution reactions
Positive ions
Electron probe microanalysis
Temperature
Phase diagrams
Volume fraction
X ray diffraction
Crystals
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

@article{d1ed0facba274d2790cd0dc9b557e4ba,
title = "Experimental determination of phase equilibria in the CaO-BaO-SiO 2 -12 mol pct. Al 2 O 3 -13 mol pct. MgO system at 1573 K and 1623 K",
abstract = "Phase equilibria of the CaO-BaO-SiO 2 -12mol pct. Al 2 O 3 -13mol pct. MgO system with a wide substitution range of CaO with BaO have been experimentally determined at 1623 K (1350°C) and 1573 K (1300°C) using high-temperature equilibration followed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA) analysis. The (Ca,Ba) 3 MgSi 2 O 8 , BaAl 2 O 4 , BaAl 2 Si 2 O 8 and Ca 2 (Al 0.46 Mg 0.54 )(Al 0.46 Si 1.54 )O 7 phases have been designated within the phase diagram. The liquidus temperature initially decreased and then increased for the samples substituting CaO with BaO at a constant (C + B)/S ratio between 1.50 and 1.86. For samples with a constant BaO/CaO ratio, the liquidus temperature showed similar trends with a lower (C + B)/S ratio from 1.22 to 0.67. The volume fraction of crystal phases of the samples as-quenched from 1573 K (1300°C) correlated well with the variation of liquidus and the primary phases. In addition, the change in the Gibbs free energy of the reactions and the bond parameter (X p  × Z/R k ) of the cations were analyzed, where the maximum change in the Gibbs free energy was found for the formation of Ca 3 MgSi 2 O 8 ; furthermore, the stronger basic tendency of Ba 2+ than Ca 2+ facilitates Ba 2+ substitution for Ca 2+ and bonding with acidic tendency cations to form Ba-containing phases.",
author = "Zhanjun Wang and Il Sohn",
year = "2019",
month = "1",
day = "1",
doi = "10.1111/jace.16426",
language = "English",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",

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TY - JOUR

T1 - Experimental determination of phase equilibria in the CaO-BaO-SiO 2 -12 mol pct. Al 2 O 3 -13 mol pct. MgO system at 1573 K and 1623 K

AU - Wang, Zhanjun

AU - Sohn, Il

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Phase equilibria of the CaO-BaO-SiO 2 -12mol pct. Al 2 O 3 -13mol pct. MgO system with a wide substitution range of CaO with BaO have been experimentally determined at 1623 K (1350°C) and 1573 K (1300°C) using high-temperature equilibration followed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA) analysis. The (Ca,Ba) 3 MgSi 2 O 8 , BaAl 2 O 4 , BaAl 2 Si 2 O 8 and Ca 2 (Al 0.46 Mg 0.54 )(Al 0.46 Si 1.54 )O 7 phases have been designated within the phase diagram. The liquidus temperature initially decreased and then increased for the samples substituting CaO with BaO at a constant (C + B)/S ratio between 1.50 and 1.86. For samples with a constant BaO/CaO ratio, the liquidus temperature showed similar trends with a lower (C + B)/S ratio from 1.22 to 0.67. The volume fraction of crystal phases of the samples as-quenched from 1573 K (1300°C) correlated well with the variation of liquidus and the primary phases. In addition, the change in the Gibbs free energy of the reactions and the bond parameter (X p  × Z/R k ) of the cations were analyzed, where the maximum change in the Gibbs free energy was found for the formation of Ca 3 MgSi 2 O 8 ; furthermore, the stronger basic tendency of Ba 2+ than Ca 2+ facilitates Ba 2+ substitution for Ca 2+ and bonding with acidic tendency cations to form Ba-containing phases.

AB - Phase equilibria of the CaO-BaO-SiO 2 -12mol pct. Al 2 O 3 -13mol pct. MgO system with a wide substitution range of CaO with BaO have been experimentally determined at 1623 K (1350°C) and 1573 K (1300°C) using high-temperature equilibration followed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA) analysis. The (Ca,Ba) 3 MgSi 2 O 8 , BaAl 2 O 4 , BaAl 2 Si 2 O 8 and Ca 2 (Al 0.46 Mg 0.54 )(Al 0.46 Si 1.54 )O 7 phases have been designated within the phase diagram. The liquidus temperature initially decreased and then increased for the samples substituting CaO with BaO at a constant (C + B)/S ratio between 1.50 and 1.86. For samples with a constant BaO/CaO ratio, the liquidus temperature showed similar trends with a lower (C + B)/S ratio from 1.22 to 0.67. The volume fraction of crystal phases of the samples as-quenched from 1573 K (1300°C) correlated well with the variation of liquidus and the primary phases. In addition, the change in the Gibbs free energy of the reactions and the bond parameter (X p  × Z/R k ) of the cations were analyzed, where the maximum change in the Gibbs free energy was found for the formation of Ca 3 MgSi 2 O 8 ; furthermore, the stronger basic tendency of Ba 2+ than Ca 2+ facilitates Ba 2+ substitution for Ca 2+ and bonding with acidic tendency cations to form Ba-containing phases.

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