Startseite Microstructural and thermodynamic study of γ-Ga2O3
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Microstructural and thermodynamic study of γ-Ga2O3

  • Matvei Zinkevich EMAIL logo , Francisco Miguel Morales , Heiko Nitsche , Martin Ahrens , Manfred Rühle und Fritz Aldinger
Veröffentlicht/Copyright: 8. Februar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 95 Heft 9

Abstract

The metastable nanocrystalline γ form of gallium oxide has been prepared and its microstructure and thermochemistry have been studied for the first time by employing X-ray and electron diffraction, high-resolution transmission electron microscopy, adiabatic and differential scanning calorimetry. The randomly oriented crystallites of maximum 5 nm in size have been observed. The sponge-like morphology of γ-Ga2O3 particles may explain the high specific surface area, previously reported for this material. The defect spinel-type structure of γ-Ga2O3 is similar to that of γ and η-Al2O3. Up to 5.7 wt.% of water can be stored in γ-Ga2O3 and subsequently released at elevated temperatures. Dry γ-Ga2O3 specifically absorbs atmospheric water at room temperature. The transformation of γ-Ga2O3 into stable β-Ga2O3 occurs in two steps. In the range 650–800 K, γ'-Ga2O3 is formed in the course of a reversible higher-order phase transition. The latter irreversibly transforms into β-form above 873 K. The enthalpy of this exothermic transformation is determined as –19.3 ± 0.4 kJ · mol–1. The coefficients of the Gibbs energy equation for γ and γ'-Ga2O3 have been assessed.

Keywords: Ga2O3; Metastable nanocrystals; HRTEM; Microstructure; Thermodynamics
Dr. Matvei Zinkevich Max-Planck-Institut für Metallforschung Pulvermetallurgisches Laboratorium Heisenbergstraße 3 D-70569 Stuttgart Germany Tel.: +49 711 6893 105 Fax: +49 711 6893131 www:http://aldix.mpi-stuttgart.mpg.de/zinkevit/home_mz.html

  1. The authors wish to express their thanks to Albrecht Meyer, Gerhard Kaiser, Ewald Schmitt, Kersten Hahn, and Maria Sycha from Max-Planck-Institute

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Received: 2004-06-24
Accepted: 2004-07-07
Published Online: 2022-02-08

© 2004 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. 85 Years DGM
  5. Fachausschuss ,,Materialographie“
  6. Fachausschuss ,,Mechanische Oberflächenbehandlungen“
  7. Fachausschuss „Titan“
  8. Fachausschuss ,,Gefüge und Eigenschaften von Polymerwerkstoffen“
  9. Characterization of the fcc/bcc orientation relationship by EBSD using pole figures and variants
  10. Microstructural and thermodynamic study of γ-Ga2O3
  11. Spray forming of 2014-Al alloy based composites with injection of SiC particulates
  12. Size effects in the plastic deformation of NiAl thin films
  13. Fracture parameters of chevron-notched Al2O3/Nb sandwich specimens
  14. HVEM in situ study of fracture of Al2O3/Nb sandwich specimens
  15. Articles Basic
  16. Assessment of thermodynamic functions in the MgO–Al2O3–SiO2 system
  17. Derivation and consistency of the partial functions of a ternary system involving interaction coefficients
  18. Contribution to the zinc-rich side of the Ti–Zn system
  19. Measurement of the surface tension of liquid Ga, Bi, Sn, In and Pb by the constrained drop method
  20. Articles Applied
  21. Model of growth kinetics of nitrided layer in the binary Fe–N system
  22. Einfluss von Molybdän auf die Beständigkeit von Stahlanoden zum Verchromen in „Chromispel-C“-Elektrolyten
  23. The mechanism of columnar-to-equiaxed transition during electromagnetic centrifugal solidification
  24. Notifications/Mitteilungen
  25. Personal/Personelles
  26. News/Aktuelles
  27. Books/Bücher
  28. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2004-0143
Schlagwörter für diesen Artikel
Ga2O3; Metastable nanocrystals; HRTEM; Microstructure; Thermodynamics

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. 85 Years DGM
  5. Fachausschuss ,,Materialographie“
  6. Fachausschuss ,,Mechanische Oberflächenbehandlungen“
  7. Fachausschuss „Titan“
  8. Fachausschuss ,,Gefüge und Eigenschaften von Polymerwerkstoffen“
  9. Characterization of the fcc/bcc orientation relationship by EBSD using pole figures and variants
  10. Microstructural and thermodynamic study of γ-Ga2O3
  11. Spray forming of 2014-Al alloy based composites with injection of SiC particulates
  12. Size effects in the plastic deformation of NiAl thin films
  13. Fracture parameters of chevron-notched Al2O3/Nb sandwich specimens
  14. HVEM in situ study of fracture of Al2O3/Nb sandwich specimens
  15. Articles Basic
  16. Assessment of thermodynamic functions in the MgO–Al2O3–SiO2 system
  17. Derivation and consistency of the partial functions of a ternary system involving interaction coefficients
  18. Contribution to the zinc-rich side of the Ti–Zn system
  19. Measurement of the surface tension of liquid Ga, Bi, Sn, In and Pb by the constrained drop method
  20. Articles Applied
  21. Model of growth kinetics of nitrided layer in the binary Fe–N system
  22. Einfluss von Molybdän auf die Beständigkeit von Stahlanoden zum Verchromen in „Chromispel-C“-Elektrolyten
  23. The mechanism of columnar-to-equiaxed transition during electromagnetic centrifugal solidification
  24. Notifications/Mitteilungen
  25. Personal/Personelles
  26. News/Aktuelles
  27. Books/Bücher
  28. Conferences/Konferenzen
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