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Titolo:
Structural evolution of lithium niobate deposited on sapphire (0 0 0 1): from early islands to continuous films
Autore:
Veignant, F; Gandais, M; Aubert, P; Garry, G;
Indirizzi:
Univcearis 06, CNRS, URA 09, Lab Mineral Cristallog, F-75252 Paris 05, Fran Univ Paris 06 Paris France 05 Mineral Cristallog, F-75252 Paris 05, Fran Univ Paris 07, CNRS, URA 09, Lab Mineral Cristallog, F-75252 Paris, FranceUniv Paris 07 Paris France F-75252 ral Cristallog, F-75252 Paris, France Thomson CSF, Cent Rech Lab, F-91404 Orsay, France Thomson CSF Orsay France F-91404 F, Cent Rech Lab, F-91404 Orsay, France
Titolo Testata:
JOURNAL OF CRYSTAL GROWTH
fascicolo: 1, volume: 196, anno: 1999,
pagine: 141 - 150
SICI:
0022-0248(199901)196:1<141:SEOLND>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINBO3 THIN-FILMS; PULSED-LASER DEPOSITION; SOLID SOURCE MOCVD; EPITAXIAL-GROWTH; CRYSTALS;
Keywords:
lithium niobate; thin film; sapphire; crystal growth; epitaxy; mechanical strains;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Veignant, F UnivPariss 06, CNRS, URA 09, Lab Mineral Cristallog, 4 Pl Jussieu, F-75252 Univ Paris 06 4 Pl Jussieu Paris France 05 l Jussieu, F-75252
Citazione:
F. Veignant et al., "Structural evolution of lithium niobate deposited on sapphire (0 0 0 1): from early islands to continuous films", J CRYST GR, 196(1), 1999, pp. 141-150

Abstract

Lithium niobate films were deposited on sapphire substrates at temperatureT-d= 750 degrees C by pulsed laser deposition. Their structure was investigated at different stages of growth by transmission electron microscopy. The epitaxial relationship already found by X-ray diffraction has been confirmed to be (0 0 0 1)(Al2O3)parallel to(0 0 0 1)(LiNbO3) and [1 1 (2) over bar 0](Al2O3)parallel to[1 1 (2) over bar 0](LiNbO3). A second cristallographic variant, rotated by 60 degrees about c-axis, was also present in some samples. At the early stages of growth, lithium niobate constitutes pyramidalislands with {0 1 (1) over bar 2} faces that have mean height of 40 nm andare misoriented from each other by 0.5 degrees on average. At the coalescence stage, surface migration of already deposited and incoming atoms from the source leads to the disappearing of pyramidal faces and the formation of20 nm height plateaux; the misorientation between initial nuclei is accommodated by formation of subgrain boundaries. Continuous films have a mosaic texture also inherited from the initial misorientation of islands. They display mechanical twins and cracks induced by tensile stresses occurring at the cooling stage from deposition to room temperature. Cracks have variable width according to the film thickness and they are oriented preferentially along [1 0 (1) over bar 0] directions. Twins are located at the border of cracks and seem to be preferential sites for their initiation. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 09/08/20 alle ore 23:13:17