Startseite TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
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TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3

  • Sung Bo Lee EMAIL logo , Si-Young Choi , Suk-Joong L. Kang und Duk Yong Yoon
Veröffentlicht/Copyright: 11. Januar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 94 Heft 3

Abstract

When BaTiO3 powder compacts with 0.2 mol% excess TiO2 are sintered in air at 1250 °C, below the eutectic temperature, some grains grow abnormally to very large sizes with double twins in the 〈111〉 directions at their centers. The abnormal grains, elongated in the 〈111〉 directions, form mostly straight grain boundaries, lying on their {111} planes with the fine matrix grains. Some grain boundaries between the nearly (111) face of an abnormal grain and the matrix grains are faceted with some facet planes lying on either the (111) plane of the abnormal grain or (210) plane of the matrix grain. These flat grain boundaries, as observed by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), must be singular, corresponding to cusps in the polar plots of the grain boundary energy against the boundary normal. A schematic analysis with the capillarity vectors shows that the straight {111} grain boundaries across the triple junctions with the matrix grains are consistent with their singular characteristics. When the specimen is heat-treated further in hydrogen atmosphere, the flat {111} grain boundaries and the faceted grain boundaries between the abnormal grain and the matrix grains become curved when observed under TEM and HRTEM. The singular grain boundaries thus become rough in hydrogen. The results represent a direct observation of the grain boundary roughening transition, which appears to be analogous to the roughening transitions of crystal surfaces.

Keywords: Grain boundary; Roughening transition; Ba-TiO3; Hydrogen atmosphere
Dr. S. B. Lee Max-Planck-Institut für Metallforschung Heisenbergstr. 3, D-70569 Stuttgart, Germany Tel.: +49 711 689 3650 Fax: +49 711 689 3522
Dedicated to Professor Dr. Dr. h. c. Manfred Rühle on the occasion of his 65th birthday

Funding statement: This work was supported by the National Research Laboratory (NRL) Programme of the Ministry of Science and Technology in Korea. Two of the authors (S. B. L. and D. Y. Y.) are grateful to the Alexander von Humboldt Foundation for the support.

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Received: 2002-07-08
Published Online: 2022-01-11

© 2003 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. The role of oxidation-induced cavities on the failure of the thermally grown oxide on binary β-NiAl alloys
  6. Phase stability of Y + Gd co-doped zirconia
  7. Mechanisms governing the distortion of alumina-forming alloys upon cyclic oxidation
  8. High-temperature oxidation of FeCrAl alloys: the effect of Mg incorporation into the alumina scale
  9. Nonlinear dielectric properties at oxide grain boundaries
  10. TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
  11. Processing of dense MgO substrates for high-temperature superconductors
  12. Microwave-induced crystallization of polysilazane-derived silicon carbonitride
  13. Schottky barrier formation in liquid-phase-sintered silicon carbide
  14. SrTiO3: a model electroceramic
  15. Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate
  16. Spreading of liquid Ag and Ag–Mo alloys on molybdenum substrates
  17. Nanoalloying in mixed AgmAun nanowires
  18. Never ending saga of a simple boundary
  19. Comparison of interfacial chemistry at Cu/α-alumina and Cu/γ-alumina interfaces
  20. Microstructure of Cu2O/Si interfaces, made by epitaxial electrodeposition
  21. Metal/oxide interfaces and their reaction with hydrogen
  22. Amorphous films at metal/ceramic interfaces
  23. Some thoughts on source monochromation and the implications for electron energy loss spectroscopy
  24. Determination of the contrast transfer function by analysing diffractograms of thin amorphous foils
  25. Progress in the preparation of cross-sectional TEM specimens by ion-beam thinning
  26. Quantification of interfacial segregation by analytical electron microscopy
  27. Quantification of elemental segregation to lath and grain boundaries in low-alloy steel by STEM X-ray mapping combined with the ζ-factor method
  28. Microstructure of Al/Ti metallization layers
  29. Connectivity of CSL grain boundaries and the role of deviations from exact coincidence
  30. Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
  31. Growth and microstructure of iron nitride layers and pore formation in ε-Fe3N
  32. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  33. Notifications/Mitteilungen
  34. Personal/Personelles
  35. Gesellschaftsnachricht
  36. International Conferences
https://doi.org/10.3139/ijmr-2003-0039
Schlagwörter für diesen Artikel
Grain boundary; Roughening transition; Ba-TiO3; Hydrogen atmosphere

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. The role of oxidation-induced cavities on the failure of the thermally grown oxide on binary β-NiAl alloys
  6. Phase stability of Y + Gd co-doped zirconia
  7. Mechanisms governing the distortion of alumina-forming alloys upon cyclic oxidation
  8. High-temperature oxidation of FeCrAl alloys: the effect of Mg incorporation into the alumina scale
  9. Nonlinear dielectric properties at oxide grain boundaries
  10. TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
  11. Processing of dense MgO substrates for high-temperature superconductors
  12. Microwave-induced crystallization of polysilazane-derived silicon carbonitride
  13. Schottky barrier formation in liquid-phase-sintered silicon carbide
  14. SrTiO3: a model electroceramic
  15. Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate
  16. Spreading of liquid Ag and Ag–Mo alloys on molybdenum substrates
  17. Nanoalloying in mixed AgmAun nanowires
  18. Never ending saga of a simple boundary
  19. Comparison of interfacial chemistry at Cu/α-alumina and Cu/γ-alumina interfaces
  20. Microstructure of Cu2O/Si interfaces, made by epitaxial electrodeposition
  21. Metal/oxide interfaces and their reaction with hydrogen
  22. Amorphous films at metal/ceramic interfaces
  23. Some thoughts on source monochromation and the implications for electron energy loss spectroscopy
  24. Determination of the contrast transfer function by analysing diffractograms of thin amorphous foils
  25. Progress in the preparation of cross-sectional TEM specimens by ion-beam thinning
  26. Quantification of interfacial segregation by analytical electron microscopy
  27. Quantification of elemental segregation to lath and grain boundaries in low-alloy steel by STEM X-ray mapping combined with the ζ-factor method
  28. Microstructure of Al/Ti metallization layers
  29. Connectivity of CSL grain boundaries and the role of deviations from exact coincidence
  30. Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
  31. Growth and microstructure of iron nitride layers and pore formation in ε-Fe3N
  32. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  33. Notifications/Mitteilungen
  34. Personal/Personelles
  35. Gesellschaftsnachricht
  36. International Conferences
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