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Seed orientation and pulling rate effects on bubbles and strain distribution on a sapphire crystal grown by the micro-pulling down method

Abstract : Undoped sapphire rod crystals (ϕ = 3 mm, length ≈ 170 mm) along different crystallographic orientations (a [11[2 with combining macron]0], m [10[1 with combining macron]0], c [0001] and c [0001] shifted 30° off axis) were successfully grown by the micro-pulling down (μ-PD) method. The bubble defect distribution was investigated as a function of the thermal gradient and pulling rates. It is observed that sapphire rods grown at a low pulling rate (v < 200 μm min−1) were bubble-free. A homogeneous temperature distribution around the capillary die will limit the bubble propagation. Pulling sapphire rods along the c-axis is a good way to minimize the bubble propagation. The effects of growth parameters on bubble and strain distribution in sapphire rods grown from μ-PD rods were discussed.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02367589
Contributor : Armelle Vidal <>
Submitted on : Monday, November 18, 2019 - 9:51:27 AM
Last modification on : Wednesday, August 26, 2020 - 2:42:47 PM

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Rekia Bouaita, G. Alombert-Goget, E. Ghezal, A. Nehari, O. Benamara, et al.. Seed orientation and pulling rate effects on bubbles and strain distribution on a sapphire crystal grown by the micro-pulling down method. CrystEngComm, Royal Society of Chemistry, 2019, 21 (28), pp.4200-4211. ⟨10.1039/c9ce00510b⟩. ⟨hal-02367589⟩

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