The activity of cobalt and silicon in the Co - Si system with special focus on the {alpha} - Co solid solution

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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} ... continued below

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9 p.

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Lexa, D.; Kematick, R.J. & Myers, C.E. August 1, 1997.

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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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9 p.

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OSTI as DE97053311

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  • 9. international conference on high-temperature materials chemistry, State College, PA (United States), 19-23 May 1997

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  • Other: DE97053311
  • Report No.: ANL/ES/CP--93123
  • Report No.: CONF-9705184--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 543670
  • Archival Resource Key: ark:/67531/metadc691690

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  • August 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 24, 2016, 1:34 p.m.

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Lexa, D.; Kematick, R.J. & Myers, C.E. The activity of cobalt and silicon in the Co - Si system with special focus on the {alpha} - Co solid solution, article, August 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc691690/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.