Melting temperature measurement of refractory oxide ceramics as a function of oxygen fugacity using containerless methods

Can Agca, Jörg C. Neuefeind, Jake W. McMurray, Richard Weber, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

Abstract

An aerodynamic conical nozzle levitator (CNL) has been used to measure the melting temperatures of refractory ceramics. The well-established method of cooling traces has been adapted to allow measurements for air-sensitive samples using a controlled atmosphere, where the oxygen partial pressure can be adjusted and monitored in real time. In this study, we explain the details of a system that we developed for use at the Spallation Neutron Source (Oak Ridge National Laboratory). Measurements of the melting behavior of (Fe,Cr,Al)3O4 spinels were made between log (PO2 (atm)) of −0.7 and −5. The melting temperature of hercynite is found to be oxygen potential dependent, ranging between 1692 and 1767°C at log (PO2) values from −4.42 to −0.70.

Original languageEnglish (US)
Pages (from-to)4867-4875
Number of pages9
JournalJournal of the American Ceramic Society
Volume103
Issue number9
DOIs
StatePublished - Sep 1 2020

Keywords

  • lasers
  • oxides
  • phase diagrams
  • thermodynamics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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