Phase Equilibrium Study of the CaO-ZnO System

Longgong Xia*, Zhihong Liu, Pekka Taskinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Phase relationships of the CaO-ZnO system in equilibrium with air (PO2 = 0.21 atm) have been studied for the first time using the equilibration/quenching/EPMA technique in the temperature range from 1000°C to 1600°C. In this study, the mutual solubility boundaries of the CaO and ZnO phases have been determined. Both CaO and ZnO have obvious solubilities in each other. The maximum solubility of ZnO in solid CaO phase is 23.21 at.% at 1535°C, and ZnO solid phase can take up to 4.81 at.% CaO at 1535°C. The eutectic point and parts of the liquidus lines have also been determined. The eutectic point was found to be at 1535°C ± 2°C and 0.6612 mole fraction of ZnO. No compound was found in this system, and there were two primary phases: halite-structured CaO (lime) and wurtzite-structured ZnO (zincite). Results from this study were compared with the CaO-ZnO phase diagram calculated by MTDATA 5.10 and its MTOX 8.1 database. The difference was significant, and the thermodynamic description of the system requires a reassessment.

Original languageEnglish
JournalJournal of the American Ceramic Society
Early online date2016
DOIs
Publication statusPublished - 1 Nov 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Ceramics
  • Microstructure
  • Phase diagram
  • Solubility
  • Thermodynamic modeling

Fingerprint Dive into the research topics of 'Phase Equilibrium Study of the CaO-ZnO System'. Together they form a unique fingerprint.

Cite this