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Calorimetric Study of Mg2Zn3

  • Masao Morishita EMAIL logo , Koichiro Koyama , Shinichi Shikada and Minoru Kusumoto
Published/Copyright: December 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 1

Abstract

The thermodynamic properties of Mg2Zn3 were investigated by calorimetry. The standard entropy of formation at 298 K, ΔfS298∘, was determined from measuring the heat capacity, Cp, from near-absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, ΔfH298∘, was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation at 298 K, ΔfG298∘, was determined from these data. The results obtained were as follows: ΔfH298∘(Mg2Zn3) = –69.80 ±20 kJ · mol – 1 ; ΔfS298∘(Mg2Zn3) = –10.95 ± 1.80 J · K–1 · mol–1; ΔfG298∘(Mg2Zn3) = –66.55 ± 20 kJ · mol – 1. The electronic contribution to the heat capacity of Mg2Zn3 was found to be similar to pure magnesium, indicating that the density of states in the vicinity of the Fermi level follows the free-electron parabolic law.

Key words: Mg2Zn3; Calorimetry; Heat capacity; Enthalpy of formation; Gibbs energy of formation
Prof. Masao Morishita Department of Materials Science and Chemistry University of Hyogo 2167 Shosha, Himeji, 671-2201 Japan Tel.: +81 792 67 4915 Fax: +81 792 66 8868

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Received: 2004-07-21
Accepted: 2004-10-28
Published Online: 2021-12-09

© 2005 Carl Hanser Verlag, München

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  20. Richtlinien für autoren
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https://doi.org/10.3139/ijmr-2005-0005
Keywords for this article
Mg2Zn3; Calorimetry; Heat capacity; Enthalpy of formation; Gibbs energy of formation

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles BBasic
  5. Interdiffusion, Kirkendall effect, and Al self-diffusion in iron–aluminium alloys
  6. Permanent magnet alloys based on Sm2Co17; phase evolution in the quinary system Sm–Zr–Fe–Co–Cu
  7. A unified equation for the viscosity of pure liquid metals
  8. Calorimetric Study of Mg2Zn3
  9. Calorimetric investigations of the two ternary systems Al–Sn–Zn and Ag–Sn–Zn
  10. Articles AApplied
  11. Precipitation of the β-phase in Al–Mg alloys
  12. Mechanical properties of saffil fiber reinforced Zinc–Aluminium alloy (ZA 27) produced by pressure die casting
  13. Deformation and fracture mechanisms of Al2O3/Nb/Al2O3 composites under compression
  14. Kinetics and dynamics of hot deformation of OFHC copper in extended temperature and strain rate ranges
  15. Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti
  16. Microstructural evolution of Al–Ni–Y powders with different sizes
  17. Thermodynamic investigations of Bi–Cd, In–Pb, and Ni–Pd liquid alloys
  18. Instructions for authors
  19. Notifications/Mitteilungen
  20. Richtlinien für autoren
  21. Personal/ Personelles
  22. Press / Presse
  23. Conferences /Konferenzen
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