ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The vaporization of samples in the SrO-CeO2 system was investigated by the use ofKnudsen effusion mass spectrometry in the temperature range of 1494 K – 1988 K. Partial pressuresof the gaseous species O2, CeO2, Sr, and SrO were determined over the samples investigated. Thepartial pressures of the species were used for the evaluation of thermodynamic activities of CeO2and SrO in the samples at 1800 K. The enthalpy of formation of SrCeO3(s) was obtained as[removed info]fH°(298 K) = -1644 ± 21 kJ mol-1. The Gibbs energy of formation of SrCeO3(s) from SrO(s) andCeO2(s) resulted as [removed info]fG°(1800 K) = -12.5 ± 2.8 kJ mol-1 for the phase field {SrCeO3 + ss of SrO inCeO2} and [removed info]fG°(1800 K) = -13.7 ± 2.1 kJ mol-1 for the phase field {SrCeO3 + SrO}. The influenceof the Yb concentration in the perovskite phase SrCe0.95Yb0.05O3 on the CeO2(s) activity was studiedas well. The thermodynamic properties obtained in the present study are discussed on the basis ofthe data available in literature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.319.pdf
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