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- Publisher
- Wiley
- Copyright
- © 2022 John Wiley & Sons, Ltd.
- ISSN
- 0951-4198
- eISSN
- 1097-0231
- DOI
- 10.1002/rcm.9306
- Publisher site
- See Article on Publisher Site
Abstract
INTRODUCTIONA search for new compositions of the zirconia‐hafnia ceramics stabilized by rare earth oxides is interesting, first of all, in view of the advantages they may provide when used as materials for thermal barrier coatings1–6 and for casting moulds and cores in the production of gas turbine engine blades.7–9 Investigation of the thermodynamic properties of the Gd2O3‐ZrO2‐HfO2 ceramics in addition to the data obtained earlier for the systems containing yttrium, lanthanum, and samarium oxides as stabilizing components10–16 will contribute greatly to the thermodynamic database significant for discovery and analysis of compositions with higher operational temperatures and thermal resistance, better durability, and stability of performance. The experimental results were obtained by the Knudsen effusion mass spectrometric method that provides information on the vapor composition over the samples under study and partial pressures of the vapor species thereby allowing the determination of the thermodynamic activities of components in the system.A phase diagram of the Gd2O3‐ZrO2‐HfO2 system has not been found in the literature. The available fragmentary information on the phase relations reported by Karaulov and Zoz17 and phase diagrams of the corresponding binary Gd2O3‐ZrO2,18 Gd2O3‐HfO2,19 and ZrO2‐HfO220 systems lead to the conclusion that, in the greater part of the Gd2O3‐ZrO2‐HfO2 triangle,
Journal
Rapid Communications in Mass Spectrometry – Wiley
Published: Jul 15, 2022