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Phase Equilibria Study in the TeO2-Na2O-SiO2 System in Air Between 723 K (500 °C) and 1473 K (1200 °C)

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Abstract

Knowledge of phase equilibria in the TeO2-Na2O-SiO2 system at elevated temperatures is important for ceramic and glass industries and for improving the operation of the smelting process of tellurium-containing materials. A review of previous investigations has indicated, however, that there are omissions in the available datasets on the liquidus temperatures of the molten TeO2-Na2O-SiO2 mixtures. The employed experimental method included equilibration of mixtures made from high purity oxides, rapid quenching of the equilibrated samples in water and followed by compositional analysis of the phases using an electron probe X-ray microanalyzer. The liquidus and phase equilibria in the TeO2-SiO2, TeO2-Na2O, and SiO2-TeO2-Na2O systems have been studied for a wide range of compositions between 723 K (500 °C) and 1473 K (1200 °C) at TeO2, SiO2, and Na2SiO3 saturations. New data have been generated in the SiO2-TeO2-Na2O system at SiO2 saturation. The liquidus compositions in the TeO2-Na2O system at TeO2 saturation have been compared with the previous data and an assessed phase diagram.

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Acknowledgments

The authors are indebted to the LPDP Scholarship of Indonesian Government for providing financial support to study at Aalto University, Finland. The SIMP program for funding the research is also greatly acknowledged. The authors also wish to thank Mr. Lassi Pakkanen for conducting EPMA measurement at GTK, Finland.

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Correspondence to Imam Santoso.

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Manuscript submitted November 16, 2015.

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Santoso, I., Taskinen, P. Phase Equilibria Study in the TeO2-Na2O-SiO2 System in Air Between 723 K (500 °C) and 1473 K (1200 °C). Metall Mater Trans B 47, 2440–2446 (2016). https://doi.org/10.1007/s11663-016-0713-y

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