The activities of cobalt and silicon at 1463 K have been determined across the whole composition range in the Co - Si system, including the {alpha} - Co solid solution, for which no activity data were previously available. Simple and reactive Knudsen effusion mass spectroscopy employed in this work were shown to successfully overcome problems normally encountered in studying high-temperature solid binary systems, such as slow equilibration and low partial pressures of the components. The composition dependence of the cobalt activities within the {alpha} - Co solid solution phase was used to calculate the self-interaction coefficients of silicon in {alpha} - Co: ln {gamma}{sub Si} = 10.4 {+-} 0.2 and {epsilon}{sub Si}{sup (Si)} = 18.6 {+-} 0.8. The regular solution model was shown to be a fairly good description of the {alpha} - Co solid solution, with an energy parameter Z{sub CoSi} of -120 {+-} 5 kJ{center_dot}mol{sup -1}. The results compare well with literature data on similar systems, such as Fe - Si and Ni - Si.
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Vaporization behavior and phase equilibria in the vanadium‐rich portion of the vanadium‐silicon system have been investigated by high temperature Knudsen cell mass spectrometry. At about 1900 K and below the single‐phase region was found to include congruently vaporizing compositions, and at about 2000 K and above was found to be congruently vaporizing. In an intermediate temperature range both the and regions will contain congruently vaporizing compositions, and there will exist a local maximum in the total vapor pressure in the solid two‐phase region; the term "euatmotic" point is suggested for this maximum. The single‐phase region was found to extend from 17.5 to 25.5 atomic percent silicon at 1800 K. Thermodynamic activities leading to free energies of phase formation were measured by direct comparison with the solid elements. Enthalpies of phase formation at 298.15 K, calculated from the experimental data in combination with published heat capacity and entropy data, are , −5.37 kK; , −6.33 kK.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand structures of and bonding in 10-electron solids: Aluminum-manganese (MnAl), chromium silicide (CrSi), vanadium phosphide (VP), titanium sulfide (TiS)R. J. Kematick and C. E. MyersCite this: Inorg. Chem. 1992, 31, 17, 3568–3572Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.acs.org/doi/10.1021/ic00043a016https://doi.org/10.1021/ic00043a016research-articleACS PublicationsRequest reuse permissionsArticle Views166Altmetric-Citations5LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
