<trans-title xml:lang="en">Impact of Crucible Bottom Shape on the Growth of Congruent Lithium Niobate Crystals by Czochralski Method</trans-title>

Yongxin HAO; Juan QIN; Jun SUN; Jinfeng YANG; Qinglian LI; Guijun HUANG; Jingjun XU

doi:10.15541/jim20240207

Journal of Inorganic Materials, Volume. 39, Issue 10, 1167(2024)

Impact of Crucible Bottom Shape on the Growth of Congruent Lithium Niobate Crystals by Czochralski Method

Yongxin HAO^1,2, Juan QIN³, Jun SUN^4、*, Jinfeng YANG⁴, Qinglian LI^1,2, Guijun HUANG^1,2, and Jingjun XU¹

Author Affiliations

¹1. School of Physics, Nankai University, Tianjin 300071, China

²2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

³3. Hangzhou Institute of Optics and Fine Mechanics, Hangzhou 311421, China

⁴4. Research Center for Crystal Materials, State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China

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Figures & Tables(11)

1. Schematic diagram of the 4-inch CLN crystal growth thermal field by Czochralski method Unit: mm

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2. Schematic diagram of the crucible bottom shape and position of the crucible relative to the induction coil for 7 times crystal growth

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3. Axial temperature gradients within the melt near the crystal-melt interface at different stages of body growth

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4. Axial temperature gradients within the crystal near the crystal-melt interface at different stages of body growth

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5. Schematic temperature distributions of crystal, melt and crucible at different stages of body growth

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6. Temperature distributions along the axis of central melt at different stage of body growth

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7. Pictures of crystals grown before and after promoting the position of the crucible relative to the induction coil using crucible with slipped bottom corner (experiments 1, 2)

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8. Pictures of crystals grown by using crucible with curved bottom corner (experiments 4-7)

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Table 1. Operating parameters used for numerical simulation

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Table 1. Operating parameters used for numerical simulation

Description	Value
Crucible inner radius /mm	160
Crucible wall thickness /mm	1.5
Height and width of the slipped bottom corner /mm	30
Radius of the curved bottom corner /mm	15
Crystal density /(kg·m^-3)	4640
Melt density /(kg·m^-3)	3530-3670
Crystal thermal conductivity /(W·m^-1·K^-1)	3.539
Melt thermal conductivity /(W·m^-1·K^-1)	4.5
Melt point /℃	1252
Thermal expansion coefficient /K^-1	1.7×10^-4
Crystal diameter /mm	105
Emissivity	0.3
Pulling rate /(mm·h^-1)	1.5
Rotate rate /(r·min^-1)	7

Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (G_melt)
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Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (G_melt)
L/mm G_melt by using C-S /(℃·cm^-1) G_meltby using C-C/(℃·cm^-1) Percentage of promotion/%
5 8.05 9.48 17.8
20 5.75 7.28 26.6
35 3.78 5.63 48.9
50 1.39 3.80 173.3

Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (G_crystal)
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Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (G_crystal)
L/mm G_crystal by using C-S/(℃·cm^-1) G_crystal by using C-C/(℃·cm^-1) Percentage of promotion/%
5 14.35 16.92 17.9
20 10.36 12.87 24.2
35 7.06 10.07 42.6
50 3.06 7.15 133.7

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Yongxin HAO, Juan QIN, Jun SUN, Jinfeng YANG, Qinglian LI, Guijun HUANG, Jingjun XU. Impact of Crucible Bottom Shape on the Growth of Congruent Lithium Niobate Crystals by Czochralski Method[J]. Journal of Inorganic Materials, 2024, 39(10): 1167

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Paper Information

Category:

Received: Apr. 23, 2024

Accepted: --

Published Online: Dec. 13, 2024

The Author Email: SUN Jun (sunjun@nankai.edu.cn)

DOI:10.15541/jim20240207

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Operating parameters used for numerical simulation

Table 1. Operating parameters used for numerical simulation

Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (Gmelt)

Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (Gmelt)

Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (Gcrystal)

Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (Gcrystal)

Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (G_melt)

Table 2. Axial temperature gradient at the melt centre near the crystal-melt interface (G_melt)

Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (G_crystal)

Table 3. Axial temperature gradient at the crystal centre near the crystal-melt interface (G_crystal)