44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
---
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title: "Micro-pulling-down"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Micro-pulling-down"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T03:53:20.674976+00:00"
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instance: "kb-cron"
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---
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The micro-pulling-down (μ-PD) method is a crystal growth technique based on continuous transport of the melted substance through micro-channel(s) made in a crucible bottom. Continuous solidification of the melt is progressed on a liquid/solid interface positioned under the crucible. In a steady state, both the melt and the crystal are pulled-down with a constant (but generally different) velocity.
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Many different types of crystal are grown by this technique, including Y3Al5O12, Si, Si-Ge, LiNbO3,
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α-Al2O3, Y2O3, Sc2O3,
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LiF, CaF2, BaF2, etc.
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== Crystal growth routine ==
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Standard routine procedure used in the growth of most of μ-PD crystals is well developed. The general stages of the growths include:
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Charging of the crucible with starting materials (mixture of powders)
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Heating of the crucible until starting materials in the crucible are completely melted
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Upward displacement of the seed until its contact with the meniscus or crucible
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Formation of the meniscus and partial melting of the seed top
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Correction of the shape of the meniscus through appropriate adjustment of crucible temperature and position of the seed crystal
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Crystal growth through pulling of the seed in downward direction
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Separation of the as grown crystal from the meniscus
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Cooling of the system (including the crystal and the crucible) to room temperature
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== See also ==
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Crystal growth
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Czochralski process
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Float-zone silicon
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Flux method
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Laser-heated pedestal growth
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Shaping processes in crystal growth
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Verneuil process
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Lithium niobate
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Sapphire
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Scandium(III) oxide
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Yttrium aluminium garnet
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== References == |