TEM observation of plastically induced dislocations in lithium niobate LiNbO3 single crystals

A. Péter, E. Fries, J. P. Riviere

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The first results of transmission electron microscope observations performed on plastically deformed LiNbO3 at T > 0.8Tm is reported. Stress orientation is chosen to activate simple and double {11̄02} 〈1̄101〉 pyramidal glide. In the foils rather low dislocation densities ∂ ≈ 107 cm-2 are observed and in a wide region pinching-off dipoles can be noticed. The identified Burgers vectors are compatible with the macroscopically observed glide directions. Dissociation according to the reaction 1/3 〈01̄11〉 → 1/18 〈2̄2̄43〉 + 1/18 〈24̄23〉 are observed. Hence the associated stacking fault is rather narrow, the dissociation preserve the integrity of the oxygen sublattice. The corresponding fault energy (γ) is about 120 mJ/m2.

Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalPhysica Status Solidi (A) Applied Research
Volume128
Issue number1
Publication statusPublished - Nov 1991

Fingerprint

lithium niobates
Dislocations (crystals)
Lithium
Single crystals
dissociation
Transmission electron microscopy
Burgers vector
transmission electron microscopy
single crystals
Stacking faults
crystal defects
integrity
Metal foil
sublattices
foils
Electron microscopes
electron microscopes
Oxygen
dipoles
oxygen

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

TEM observation of plastically induced dislocations in lithium niobate LiNbO3 single crystals. / Péter, A.; Fries, E.; Riviere, J. P.

In: Physica Status Solidi (A) Applied Research, Vol. 128, No. 1, 11.1991, p. 45-53.

Research output: Contribution to journalArticle

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