Powder Metallurgy and Metal Ceramics

, Volume 41, Issue 3–4, pp 173–176

The Enthalpies of DySi2 and HoSi1.67 at 298.15-2007 K. Phase Transformation Enthalpies

  • Nikolai P. Gorbachuk
  • Alexander S. Bolgar
Article

Abstract

Mixing calorimetry method has been used over the range 298.15-2007 K to measure the enthalpies of dysprosium and holmium disilicides. Measurements have been made on the temperatures, enthalpies, and entropies of the phase transformation and melting of the disilicides. Temperature-dependence curves have been drawn up for the main thermodynamic functions of these compounds over a wide temperature range.

chemical thermodynamics calorimetry silicides heat capacity entropy enthalpy reduced Gibbs energy phase transition 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

REFERENCES

  1. 1.
    Yu. I. Buyanov, T. Ya. Velikanova, S. P. Luzan, et al., Interactions between Rare-Earth Metals and Silicon, Preprint [in Russian], Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev (1997), No. 97-5.Google Scholar
  2. 2.
    N. P. Gorbachuk, A. S. Bolgar, and A. V. Blinder, Thermodynamic Parameters of Silicides, Preprint [in Russian], Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev (1995), No. 10Google Scholar
  3. 3.
    S. V. Meshel and O. I. Kleppa, “Standard enthalpies of formation of some carbides, silicides, germanides, stanides and borides of dysprosium by high temperature direct-synthesis calorimetry,” J. Alloys Comp., 233, 272–278 (1996).Google Scholar
  4. 4.
    G. I. Batalin, V. S. Sudavtsova, and N. V. Stroganova, “Enthalpies of formation of liquid binary alloys in the systems Si - La (Gd, Dy, Ho, Er),” Ukr. Khim. Zhurn., 51, No. 7, 775–777 (1985).Google Scholar
  5. 5.
    A. S. Bolgar, N. P. Gorbachuk, and A. V. Blinder, “Enthalpies of the silicides Gd5Si3, Gd5Si4, GdSi, GdSi1.88 in the temperature range 298.15-2200 K. Enthalpies of melting,” Teplofizika Vysokikh Temperatur, 34, No. 4, 541–545 (1996).Google Scholar
  6. 6.
    E. A. Guseva, A. S. Bolgar, S. P. Gordienko, et al., “Determining the enthalpy of self-bonded silicon carbide,” Teplofizika Vysokikh Temperatur, 4, No. 5, 649–653 (1966).Google Scholar
  7. 7.
    A. S. Bolgar, V. F. Litvinenko, A. G. Turchanin, and A. A. Mashnitskii, “Enthalpy and heat capacity of a material based on boron and aluminum nitrides,” in: Investigation of Nitrides[in Russian], Institute for Problems of Materials Scienc, Acad. Sci. Ukrainian SSR, Kiev (1975), pp. 83–87.Google Scholar
  8. 8.
    V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, and P. S. Martsenyuk, “Structure, composition, and phase equilibria in alloys of dysprosium with silicon,” Ukr. Khim. Zhurn., 60, No. 8, 544–551 (1994).Google Scholar
  9. 9.
    V. N. Eremenko, V. E. Listovnichii, S. P. Luzan, et al., “Phase equilibria and structure of alloys in the holmium-silicon system,” in: Phase Equilibria, Phase Stability, and Metastable States in Metallic Systems[in Russian], Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev (1993), pp. 32–48.Google Scholar
  10. 10.
    V. F. Litvinenko, A. S. Bolgar, V. B. Muratov, et al., Processing Experimental Data on Enthalpy Subject to Additional Conditions[in Russian], Deposited at VINITI, 19.09.84, No. 6300B (1984).Google Scholar
  11. 11.
    High-Temperature Chemistry and Chemical Thermodynamics of Refractory Compounds and Materials Based on Them with the Thermodynamic Simulation of the Synthesis of Composite Materials for Various Purposes: Report on Research and Development[in Ukrainian], Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev (1998).Google Scholar
  12. 12.
    G. V. Samsonov, L. A. Dvorina, and B. M. Rud', The Silicides[in Russian], Metallurgiya, Moscow (1979).Google Scholar
  13. 13.
    N. P. Gorbachuk, Thermodynamic Parameters of the Silicides of Lanthanum, Praseodymium, and Gadolinium, PhD Thesis [in Russian], Kiev (1994).Google Scholar

Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • Nikolai P. Gorbachuk
    • 1
  • Alexander S. Bolgar
    • 1
  1. 1.National Academy of Sciences of UkraineInstitute for Problems of Materials ScienceKiev 142Ukraine

Personalised recommendations