| Autor: |
Lasloudji, Idir, Mokhtari, Faiza, Nehari, Abdeldjelil, Alombert-Goget, Guillaume, Lebbou, Kheirreddine |
| Předmět: |
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| Zdroj: |
CrystEngComm; 2/28/2018, Vol. 20 Issue 8, p1110-1115, 6p |
| Abstrakt: |
The Czochralski (Cz) technique under an argon/oxygen atmosphere has been used to grow 35 mm diameter La3Ga5.5Ta0.5O14 langatate (LGT) crystals along the Z-axis. Addition of an afterheater is proposed to improve the growth and crystal properties. Two furnace configurations, without and with an afterheater, are investigated experimentally and numerically. A global model for the entire furnace was used in investigating the mechanism of flow, heat transfer, melt–crystal interface shape and 3-d thermal stress considering the crystal anisotropy. Addition of the afterheater changes considerably the thermal field in the growth atmosphere. A decrease of 56% of the maximum von Mises stress and 30% of the interface convexity are found through the use of the afterheater. Experimentally, a more stable growth has been achieved and this resulted in a good quality crystal. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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