Micro-tube Sapphire Crystal Grown by the Edge-defined-film Fed Method

doi:10.15541/jim20190085

Abstract

Abstract:

Sapphire rod with micro-tube (inner diameter: 470 μm) and sapphire plate with micro-tube (inner diameter: 160 μm) were grown by the edge-defined-film fed method (EFG). Profile curves of the small liquid menisci were investigated on the base of numerical solution of the Young-Laplace equation. By inserting Mo wires, new type of die was designed to form and sustain size of micro-tube in the volume of the crystal. Two problems were solved at the same time: 1) obtaining high quality sapphire crystal; 2) forming and sustaining necessary micro-tube sizes in the volume of the crystal. The crystal were transparent, colorless, no cracking and good XRC value of 3.8 arcmin, demonstrating the high quality of the as-grown crystal.

Key words: micro-tube sapphire crystal, edge-defined-film fed growth method, crystal growth

CLC Number:

O782

WANG Dong-Hai, XUE Yan-Yan, LI Na, ZHOU Shi-Ming, XU Xiao-Dong, LI Dong-Zhen, XU Jun, WANG Qing-Guo. Micro-tube Sapphire Crystal Grown by the Edge-defined-film Fed Method[J]. Journal of Inorganic Materials, 2019, 34(12): 1290-1294.

Figures/Tables 10

Fig. 1 Schematic diagram of tube forming by a hollow in the die surface

Table 1 Minimal inner sizes of sapphire tube grown by different companies with EFG method

Company	Minimal tube ID size/mm	Nation
Tydex	0.80	Russia
Rostox-N	0.50	Russia
Namiki	2.00	Japan
Kyocera	1.30	Japan
Saint-gobain	0.58	France
Crytur	0.60	Australia

Fig. 2 Schematic diagram of micro-tube forming

Fig. 3 Calculation model of sapphire tube growth

Fig. 4 Profile curves of small internal menisci at different crystal radii

Fig. 5 Profile curve of sapphire tube with outer diameter of 5.98 mm and inner diameter of 0.47 mm

Fig. 6 A raise meniscus level and rod formation

Fig. 7 (a) Photo of as-grown micro-tube sapphire with the inner diameter of 0.47 mm; (b) Microscopic photo of the as-grown micro-tube sapphire; (c) SEM image of the as-grown micro-tube sapphire

Fig. 8 (a) Photo of as-grown micro-tube sapphire with the inner diameter of 0.16 mm; (b) Microscopic photo of the as-grown micro-tube sapphire

Fig. 9 X-ray rocking curve of the as-grown micro-tube sapphire crystal

References 10

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