Thermodynamics of the intermediate phases in the Mg-B system (Articolo in rivista)

Type
Label
  • Thermodynamics of the intermediate phases in the Mg-B system (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.jpcs.2004.06.063 (literal)
Alternative label
  • G. Balducci, S. Brutti, A. Ciccioli, G. Gigli, P. Martinetti, A. Palenzona, M. F. Butman, L. Kudin (2005)
    Thermodynamics of the intermediate phases in the Mg-B system
    in Journal of physics and chemistry of solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Balducci, S. Brutti, A. Ciccioli, G. Gigli, P. Martinetti, A. Palenzona, M. F. Butman, L. Kudin (literal)
Pagina inizio
  • 292 (literal)
Pagina fine
  • 297 (literal)
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  • 66 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • Sapienza Università di Roma (literal)
Titolo
  • Thermodynamics of the intermediate phases in the Mg-B system (literal)
Abstract
  • The high temperature vaporization thermochemistry of the intermediate phases in the B-rich portion of the Mg-B phase diagram (above 80% at. B) has been extensively studied by Knudsen Effusion-Mass Spectrometry (KEMS) and Knudsen Effusion-Weight Loss (KEWL) techniques. The temperature dependence of the Mg vapor pressures in equilibrium over the binary alloys in the composition range 87.5-95.2 and 95.2-100%at. B (corresponding to the two biphasic regions MgB7 + MgB20 and MgB20 + beta-B, respectively) has been measured in the temperature range 1162-1467 K. The enthalpy changes of the decomposition reactions for MgB7 and MgB20 are presented together with previously determined data for the Mg-richest phases MgB2 and MgB4 and a self-consistent set of formation enthalpies for all the four Mg-B phases has been derived. The proposed experimental formation enthalpies, Delta(f)H(298)(0), are MgB2: -41.1 +/- 2.2, MgB4: - 29.9 +/- 2.0, MgB7: -20.3 +/- 1.5, MgB20: - 8.5 +/- 0.6 kJ/mol atoms. Using the present and literature data the Mg-B thermodynamic description has been newly assessed using Thermo-Calc software and the whole phase diagram redrawn. Good agreement was obtained between the calculated results and the experimental data. (c) 2004 Elsevier Ltd. All rights reserved (literal)
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