Phase diagram study and thermodynamic assessment of the Na2O-ZrO2 system

Jaesung Lee; Sun Yong Kwon; In Ho Jung

doi:10.1016/j.jeurceramsoc.2021.08.006

Phase diagram study and thermodynamic assessment of the Na₂O-ZrO₂ system

Jaesung Lee, Sun Yong Kwon, In Ho Jung

Microstructural Evolution Modeling

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The phase diagram of the Na₂O-ZrO₂ system was experimentally investigated using the classical equilibration/quenching method and differential thermal analysis (DTA) followed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) phase analysis. For the first time, the general feature of the phase diagram between Na₂ZrO₃ and ZrO₂ above 1773 K was revealed experimentally. The eutectic reaction between NaZrO₃ and cubic-ZrO₂ was found at 64.8 mol % ZrO₂ at 1883 ± 3 K. Cubic-ZrO₂ was stabilized by the dissolution of Na₂O (maximum solubility of 7.1 mol % Na₂O at 1883 ± 3 K). Based on new experimental phase diagram data in this study and thermodynamic property data of Na₂ZrO₃ in the literature, the Na₂O-ZrO₂ system was thermodynamically optimized using the CALculation of PHAse Diagram (CALPHAD) method and a consistent set of the Gibbs energy functions for all phases in the binary system was prepared.

Original language	English
Pages (from-to)	7946-7956
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	41
Issue number	15
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2021.08.006
State	Published - Dec 2021

Funding

Financial supports from Tata Steel Europe, Posco, Hyundai Steel, Nucor Steel, RioTionto Iron and Titanium, Nippon Steel Corp. JFE Steel, Voestalpine, RHI Magnesita, SeAH Besteel, Doosan Heavy Industry and Construction, and SCHOTT AG are gratefully acknowledged. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2020R1A5A6017701). Financial supports from Tata Steel Europe, Posco, Hyundai Steel, Nucor Steel, RioTionto Iron and Titanium, Nippon Steel Corp., JFE Steel, Voestalpine, RHI Magnesita, SeAH Besteel, Doosan Heavy Industry and Construction, and SCHOTT AG are gratefully acknowledged. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2020R1A5A6017701 ).

Keywords

CALPHAD
NaO-ZrO
NaZrO
Phase diagram
cubic-ZrO

Access to Document

10.1016/j.jeurceramsoc.2021.08.006

Cite this

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title = "Phase diagram study and thermodynamic assessment of the Na2O-ZrO2 system",

abstract = "The phase diagram of the Na2O-ZrO2 system was experimentally investigated using the classical equilibration/quenching method and differential thermal analysis (DTA) followed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) phase analysis. For the first time, the general feature of the phase diagram between Na2ZrO3 and ZrO2 above 1773 K was revealed experimentally. The eutectic reaction between NaZrO3 and cubic-ZrO2 was found at 64.8 mol % ZrO2 at 1883 ± 3 K. Cubic-ZrO2 was stabilized by the dissolution of Na2O (maximum solubility of 7.1 mol % Na2O at 1883 ± 3 K). Based on new experimental phase diagram data in this study and thermodynamic property data of Na2ZrO3 in the literature, the Na2O-ZrO2 system was thermodynamically optimized using the CALculation of PHAse Diagram (CALPHAD) method and a consistent set of the Gibbs energy functions for all phases in the binary system was prepared.",

keywords = "CALPHAD, NaO-ZrO, NaZrO, Phase diagram, cubic-ZrO",

author = "Jaesung Lee and Kwon, {Sun Yong} and Jung, {In Ho}",

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year = "2021",

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AU - Kwon, Sun Yong

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N2 - The phase diagram of the Na2O-ZrO2 system was experimentally investigated using the classical equilibration/quenching method and differential thermal analysis (DTA) followed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) phase analysis. For the first time, the general feature of the phase diagram between Na2ZrO3 and ZrO2 above 1773 K was revealed experimentally. The eutectic reaction between NaZrO3 and cubic-ZrO2 was found at 64.8 mol % ZrO2 at 1883 ± 3 K. Cubic-ZrO2 was stabilized by the dissolution of Na2O (maximum solubility of 7.1 mol % Na2O at 1883 ± 3 K). Based on new experimental phase diagram data in this study and thermodynamic property data of Na2ZrO3 in the literature, the Na2O-ZrO2 system was thermodynamically optimized using the CALculation of PHAse Diagram (CALPHAD) method and a consistent set of the Gibbs energy functions for all phases in the binary system was prepared.

AB - The phase diagram of the Na2O-ZrO2 system was experimentally investigated using the classical equilibration/quenching method and differential thermal analysis (DTA) followed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) phase analysis. For the first time, the general feature of the phase diagram between Na2ZrO3 and ZrO2 above 1773 K was revealed experimentally. The eutectic reaction between NaZrO3 and cubic-ZrO2 was found at 64.8 mol % ZrO2 at 1883 ± 3 K. Cubic-ZrO2 was stabilized by the dissolution of Na2O (maximum solubility of 7.1 mol % Na2O at 1883 ± 3 K). Based on new experimental phase diagram data in this study and thermodynamic property data of Na2ZrO3 in the literature, the Na2O-ZrO2 system was thermodynamically optimized using the CALculation of PHAse Diagram (CALPHAD) method and a consistent set of the Gibbs energy functions for all phases in the binary system was prepared.

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