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Effect of supersaturation on hillock of directional Growth of KDP crystals.

Liu FF, Yu GW, Zhang LS, Li L, Wang B, Gan XY, Ren HK, Zhou HL, Zhu LL, Ji SH, Xu MX, Liu BA, Xu XG, Gu QT, Sun X - Sci Rep (2014)

Bottom Line: When hillock slopes on the (100) face of KDP crystals were measured within the supersaturation (σ) range of 0 < σ ≤ 0.06, the slope of hillocks with hollow cores depended nonlinearly on supersaturation.Below σ = 0.02, the hillock slope depended on supersaturation, but when σ was ≥ 0.02, the hillock slope increased more gradually and was less dependent on supersaturation.The result verified that the reversed growth appears to occur within hollow channels found on growth hillocks.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Crystal Materials, Shandong University Jinan 250100, China [2] Key Laboratory of Functional Crystal Materials and Device, Ministry of Education, Shandong Universiy Jian 250100, China.

ABSTRACT
KDP single crystals were grown in aqueous solution by using "point seeds" with a defined crystallographic direction of 59° to the Z axis. When hillock slopes on the (100) face of KDP crystals were measured within the supersaturation (σ) range of 0 < σ ≤ 0.06, the slope of hillocks with hollow cores depended nonlinearly on supersaturation. Below σ = 0.02, the hillock slope depended on supersaturation, but when σ was ≥ 0.02, the hillock slope increased more gradually and was less dependent on supersaturation. Hollow funnel-shaped growth dislocation on the (100) face of KDP crystals was observed at σ = 0.04, characterized by large holes with micro-steps and step bunching inside, the formation of which were analyzed. The result verified that the reversed growth appears to occur within hollow channels found on growth hillocks.

No MeSH data available.


Related in: MedlinePlus

General view of the seed, (a), and a crystal grown from seed in defined direction of 59° with respect to Z axis, (b), the schematic diagram of KDP single crystals grown with seeds of 59° to Z axis (the left) and Z-cut seeds (the right), (c).(The black arrow represents the vertical direction of crystallizer).
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f1: General view of the seed, (a), and a crystal grown from seed in defined direction of 59° with respect to Z axis, (b), the schematic diagram of KDP single crystals grown with seeds of 59° to Z axis (the left) and Z-cut seeds (the right), (c).(The black arrow represents the vertical direction of crystallizer).

Mentions: In this work, KDP crystals were grown in an aqueous solution using point seeds with a defined crystallographic direction of 59° to the Z axis (see Figure 1 a, b). In comparison with the crystal grown using a conventional Z-cut seed, the prism faces of the KDP crystal grown in our experiment are not parallel to the vertical direction of the crystallizer (see Figure 1c). Hillock slopes on the (100) face of KDP were measured within the supersaturation range of 0 < σ ≤ 0.06. We found that the slope of hillocks with hollow cores increased nonlinearly with supersaturation values ≤ 0.02, but for σ ≥ 0.02, hillock slopes increased more gradually and leveled off. A model was established to explain this phenomenon. Using this model, mathematical relationships were developed to predict the correlation between hillock slope and supersaturation. This model agrees well with our observations on the crystal growth on the (100) face of KDP.


Effect of supersaturation on hillock of directional Growth of KDP crystals.

Liu FF, Yu GW, Zhang LS, Li L, Wang B, Gan XY, Ren HK, Zhou HL, Zhu LL, Ji SH, Xu MX, Liu BA, Xu XG, Gu QT, Sun X - Sci Rep (2014)

General view of the seed, (a), and a crystal grown from seed in defined direction of 59° with respect to Z axis, (b), the schematic diagram of KDP single crystals grown with seeds of 59° to Z axis (the left) and Z-cut seeds (the right), (c).(The black arrow represents the vertical direction of crystallizer).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4217111&req=5

f1: General view of the seed, (a), and a crystal grown from seed in defined direction of 59° with respect to Z axis, (b), the schematic diagram of KDP single crystals grown with seeds of 59° to Z axis (the left) and Z-cut seeds (the right), (c).(The black arrow represents the vertical direction of crystallizer).
Mentions: In this work, KDP crystals were grown in an aqueous solution using point seeds with a defined crystallographic direction of 59° to the Z axis (see Figure 1 a, b). In comparison with the crystal grown using a conventional Z-cut seed, the prism faces of the KDP crystal grown in our experiment are not parallel to the vertical direction of the crystallizer (see Figure 1c). Hillock slopes on the (100) face of KDP were measured within the supersaturation range of 0 < σ ≤ 0.06. We found that the slope of hillocks with hollow cores increased nonlinearly with supersaturation values ≤ 0.02, but for σ ≥ 0.02, hillock slopes increased more gradually and leveled off. A model was established to explain this phenomenon. Using this model, mathematical relationships were developed to predict the correlation between hillock slope and supersaturation. This model agrees well with our observations on the crystal growth on the (100) face of KDP.

Bottom Line: When hillock slopes on the (100) face of KDP crystals were measured within the supersaturation (σ) range of 0 < σ ≤ 0.06, the slope of hillocks with hollow cores depended nonlinearly on supersaturation.Below σ = 0.02, the hillock slope depended on supersaturation, but when σ was ≥ 0.02, the hillock slope increased more gradually and was less dependent on supersaturation.The result verified that the reversed growth appears to occur within hollow channels found on growth hillocks.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Crystal Materials, Shandong University Jinan 250100, China [2] Key Laboratory of Functional Crystal Materials and Device, Ministry of Education, Shandong Universiy Jian 250100, China.

ABSTRACT
KDP single crystals were grown in aqueous solution by using "point seeds" with a defined crystallographic direction of 59° to the Z axis. When hillock slopes on the (100) face of KDP crystals were measured within the supersaturation (σ) range of 0 < σ ≤ 0.06, the slope of hillocks with hollow cores depended nonlinearly on supersaturation. Below σ = 0.02, the hillock slope depended on supersaturation, but when σ was ≥ 0.02, the hillock slope increased more gradually and was less dependent on supersaturation. Hollow funnel-shaped growth dislocation on the (100) face of KDP crystals was observed at σ = 0.04, characterized by large holes with micro-steps and step bunching inside, the formation of which were analyzed. The result verified that the reversed growth appears to occur within hollow channels found on growth hillocks.

No MeSH data available.


Related in: MedlinePlus