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Physique des Verres
(24) Production(s) de l'année 2016
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Lowering of ground state induced by core-shell structure in strontium titanate 
Auteur(s): Kiat Jean-Michel, Hehlen B., Anoufa Mickaël, Bogicevic Christine, Curfs A, Boyer Bernard, Al-Sabbagh A, Porcher F, Al-Zein A.
(Article) Publié:
Physical Review B, vol. 93 p.144117 - 144117 (2016)
Texte intégral en Openaccess : 
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Piezoelectric and non-linear optical properties of α-quartz type Si1−xGexO2 single crystals
Auteur(s): Clavier Damien, Prakasam Mythili, Largeteau Alain, Boy Jean-Jacques, Hehlen B., Cambon Martine, Hermet P., Haines Julien, Cambon Olivier
(Article) Publié:
Crystengcomm, vol. 18 p.2500-2508 (2016)
Ref HAL: hal-01307454_v1
DOI: 10.1039/C5CE02477C
WoS: 000373566300012
Exporter : BibTex | endNote
6 Citations
Résumé: Single crystals of α-quartz type Si1−xGexO2 with x < 0.2 were grown in 0.05 M NaOH solution. Infrared measurements confirmed that crystals grown at high pressure and high temperature have a low –OH group defect content. After a few millimeters of crystal growth under these conditions, α3500 reaches 0.1 cm−1 and no free –OH are present. The d11 value measured on an X-cut from the crystal with x = 0.0375 is 3.08 pC N−1 (±0.15), in good agreement with the value of 2.97 pC N−1 obtained using density functional theory based calculations. Piezoelectric measurements were performed on the Si1−xGexO2 crystal with x = 0.0375, both at room temperature and after annealing at various temperatures. The piezoelectric signal of the crystal with x = 0.0375 and pure SiO2 disappears after annealing at 635 °C and 545 °C, respectively. Nonlinear optical (NLO) properties of Si1−xGexO2 crystals were measured by Maker's fringe technique on Z-cut χ11(2) and their corresponding values for x = 0.023 and 0.028 are 1.3(2) pm V−1 and 1.6(2) pm V−1, respectively. These values are in good agreement with density functional theory based calculations. The light induced damage threshold values measured on Si1−xGexO2 crystals with x = 0.023 and 0.028 are very similar to that of α-quartz.
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