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- W1967163717 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 {1102} 〈1101〉 pyramidal glide. In the foils rather low dislocation densities ϱ ≈ 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 〈0111〉 1/18 〈2243〉 + 1/18 〈2423〉 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.Nous presentons nos premieres observations au microscope electronique en transmission du LiNbO3 deforme a T > 0.8 Tf, les directions de compression etant choisies pour activer un systěme de glissement {l102} 〈1l01〉 double ou simple. La densite de dislocations dans la lame mince est tres faible: ϱ ≈ 107 cm −2. Nous avons observe un champ etendu de dipoles qui se pincent. Les vecteurs de Burgers identifies sont en accord avec les directions de glissement observees macroscopiquement. Nous avons pu mettre en evidence la dissociation des dislocations suivant la reaction: 1/3 〈0111〉 1/18 〈2243〉 + 1/18 〈2423〉. La faute d'empilement est tres etroite et preserve le reseau d'oxygene, son energie γ est de l'orde de 120 mJ/m2." @default.
- W1967163717 created "2016-06-24" @default.
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- W1967163717 date "1991-11-16" @default.
- W1967163717 modified "2023-09-23" @default.
- W1967163717 title "TEM Observation of Plastically Induced Dislocations in Lithium Niobate LiNbO3 Single Crystals" @default.
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- W1967163717 doi "https://doi.org/10.1002/pssa.2211280106" @default.
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