Thermodynamic vaporization studies of the manganese oxide–yttria stabilized zirconia (YSZ) solid solution

• Published in: Journal of the European Ceramic Society 2004-08, Vol.24 (9), p.2649-2656
• Main Authors: Matraszek, Aleksandra, Miller, Miroslaw, Singheiser, Lorenz, Hilpert, Klaus
• Format: Article
• Language: English
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Chemical properties; Condensed matter: structure, mechanical and thermal properties; Energy; Energy. Thermal use of fuels; Equations of state, phase equilibria, and phase transitions; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Liquid-vapor transitions; Miscellaneous; Physics; Specific phase transitions; Technical ceramics; Vaporization; ZrO 2
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2003.09.015

Samples of the compositions (Zr 0.85Y 0.15) 1− x Mn x O 1.93−δ, 0.02⩽ x⩽0.25, were prepared and characterized by means of XRD and SEM/EDX analysis. The vaporization of manganese oxide from the samples with x ⩽0.18 was studied by Knudsen effusion mass spectrometry in the temperature range of 1539–1858 K. Partial pressures of gaseous Mn, MnO, and O 2 were determined over the samples investigated and thermodynamic activities of MnO in the samples evaluated at 1700 K. Chemical and phase compositions of the samples were determined after the vaporization measurements and the results obtained were correlated with the obtained values of the thermodynamic activity of MnO. The thermodynamic activities determined belong to the solubility range of manganese oxide in yttria stabilized zirconia. Moreover, thermodynamic data on the vaporisation of pure MnO(s) resulted.