Solid-liquid interface shapes in the floating zone growth of rutile single crystals

The difficulties in growing large-size bulk β-Ga2O3 single crystals with the Czochralski method were numerically analyzed. The flow and temperature fields for crystals that were four and six inches in diameter were studied. When the crystal diameter is large and the crucible space becomes small, the flow field near the crystal edge becomes poorly controlled, which results in an unreasonable temperature field, which makes the interface velocity very sensitive to the phase boundary shape. The effect of seed rotation with increasing crystal diameter was also studied. With the increase in crystal diameter, the effect of seed rotation causes more uneven temperature distribution. The difficulty of growing large-size bulk β-Ga2O3 single crystals with the Czochralski method is caused by spiral growth. By using dynamic mesh technology to update the crystal growth interface, the calculation results show that the solid–liquid interface of the four-inch crystal is slightly convex and the center is slightly concave. With the increase of crystal growth time, the symmetry of cylindrical crystal will be broken, which will lead to spiral growth. The numerical results of the six-inch crystal show that the whole solid–liquid interface is concave and unstable, which is not conducive to crystal growth.

Download Full-text

DIFFUSION OF Tl+ IONS THROUGH THE INTERFACE OF SOLID NaCl, KCl OR RbCl AND LIQUID TlCl

International Journal of Modern Physics B ◽

10.1142/s0217979202009524 ◽

2002 ◽

Vol 16 (01n02) ◽

pp. 108-113

Author(s):

W. YU ◽

A. FUJII

Keyword(s):

Sodium Chloride ◽

Single Crystals ◽

Optical Method ◽

Diffusion Constant ◽

Liquid Interface ◽

Diffusion Constants ◽

Diffusion Phenomena ◽

Diffusion Source ◽

Solid Liquid Interface ◽

Solid Liquid

The diffusion phenomena of thallous ions ( Tl + ions) through solid-liquid interface of liquid Tl + ions diffusion source and sodium chloride (NaCl) , potassium chloride (KCl) or rubidium chloride (RbCl) single crystals are studied by optical method. The characterisic absorption peaks of Tl + center in NaCl, KCl or RbCl single crystals were used as the tracer for measurements and the diffusion constants are evaluated at various temperatures. The results show that the diffusion constant of solid-liquid interface is about 103 times larger than that of solid-solid interface of KCl and TlCl .

Download Full-text

Effects of the diameter of rutile (TiO2) single crystals grown using tilting-mirror-type infrared heating image furnace on solid–liquid interface and etch pit density

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2011.01.035 ◽

2011 ◽

Vol 317 (1) ◽

pp. 135-138 ◽

Cited By ~ 12

Author(s):

Md. Abdur Razzaque Sarker ◽

Satoshi Watauchi ◽

Masanori Nagao ◽

Takashi Watanabe ◽

Isamu Shindo ◽

...

Keyword(s):

Single Crystals ◽

Liquid Interface ◽

Infrared Heating ◽

Etch Pit Density ◽

Rutile Tio2 ◽

Etch Pit ◽

Solid Liquid Interface ◽

Solid Liquid

Download Full-text

Crystal Growth Of A Decagonal AI-Co-Ni Quasicrystal

MRS Proceedings ◽

10.1557/proc-553-37 ◽

1998 ◽

Vol 553 ◽

Author(s):

J.Q. Guo ◽

T. J. Sato ◽

T. Kimura ◽

T. Hirano ◽

A. P. Tsai

Keyword(s):

Liquid Interface ◽

Floating Zone ◽

Solute Redistribution ◽

Zone Method ◽

Decagonal Quasicrystal ◽

X Ray ◽

State Growth ◽

Solid Liquid Interface ◽

Solid Liquid ◽

Very High

AbstractWe have grown a decagonal single quasicrystal with a size of centimeter order in an A172Co16Ni12 alloy by floating zone method at a growth rate of 0.5 mm/h. The single decagonal quasicrystal has been inspected by Laue X-ray as well as neutron diffraction, revealing a very high quasicrystalline quality. By quenching the liquid during growth, a flat solid-liquid interface has been directly observed. There exists solute redistribution at the growing solid-liquid interface. At steady state growth Al is enriched and Co, Ni are depleted in front of solid-liquid interface. Solute partition ratios of Al, Co and Ni were determined to be about 0.91, 1.57 and 1.08, respectively.

Download Full-text