Study on Kinetic Competitions of Crystal Growth

2013 ◽  
Vol 690-693 ◽  
pp. 1788-1791
Author(s):  
Tao He
Keyword(s):  
Crystal Growth ◽  
Crystal Morphology ◽  
Film Growth ◽  
Axiomatic Approach ◽  
Growth Mechanisms ◽  
Growth Morphology ◽  
Growth Processes ◽  
Full Generality ◽  
Stages Of Growth ◽  
Key Issues

One of the key issues is in crystal growth technologies is control of crystal morphology. This paper attends to understand film growth in its full generality is to propose a growth law, and it is capable of describing all types of growth mechanisms and determining the growth morphology at different stages of growth. We refer to an axiomatic approach to identify the important scaling in growth processes. One way to determine which processes dominate the competition is to form dimensionless parameters which embody the competitions between pairs of kinetic processes.

Crystal growth, morphology, structure, and properties of HNaMP2O7 crystals where M = Co and Ni

1994 ◽  
Vol 9 (6) ◽  
pp. 1519-1525 ◽  
Author(s):  
K. Byrappa ◽  
Umesh B.V. Dutt ◽  
A. Clearfield ◽  
Damodara M. Poojary
Keyword(s):  
Crystal Structure ◽  
Crystal Growth ◽  
Hydrothermal Method ◽  
Growth Process ◽  
Crystal Morphology ◽  
Structure And Properties ◽  
Growth Morphology ◽  
Solute Interaction

The HNaMP2O7 (where M = Co and Ni) new Na+ superionic pyrophosphates were obtained by the hydrothermal method at lower PT conditions (T = 250 °C, P = 100 atm). The solubility, complexation with reference to the solvent-solute interaction, and the growth process have been studied in detail. A new investigation on the crystal structure of these compounds showed that the title compounds do not contain Zr as reported previously. The crystal morphology and properties have also been studied.

Crystal morphology prediction of energetic materials grown from solution: insights into the accurate calculation of attachment energies

CrystEngComm ◽  
2019 ◽  
Vol 21 (33) ◽  
pp. 4910-4917 ◽  
Author(s):  
Yingzhe Liu ◽  
Shiyao Niu ◽  
Weipeng Lai ◽  
Tao Yu ◽  
Yiding Ma ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Energetic Materials ◽  
Crystal Morphology ◽  
Energy Model ◽  
Growth Morphology ◽  
Accurate Calculation ◽  
Attachment Energy

Reasonable modifications to the attachment energy model were made for accurately predicting the crystal growth morphology of energetic materials in solution.

scholarly journals Crystal Growth Behaviors of Silicon during Melt Growth Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Kozo Fujiwara
Keyword(s):  
Solar Cells ◽  
Crystal Growth ◽  
Growth Mechanisms ◽  
Morphological Transformation ◽  
Growth Processes ◽  
Melt Growth ◽  
Fine Control ◽  
Faceted Dendrite

It is imperative to improve the crystal quality of Si multicrystal ingots grown by casting because they are widely used for solar cells in the present and will probably expand their use in the future. Fine control of macro- and microstructures, grain size, grain orientation, grain boundaries, dislocation/subgrain boundaries, and impurities, in a Si multicrystal ingot, is therefore necessary. Understanding crystal growth mechanisms in melt growth processes is thus crucial for developing a good technology for producing high-quality Si multicrystal ingots for solar cells. In this review, crystal growth mechanisms involving the morphological transformation of the crystal-melt interface, grain boundary formation, parallel-twin formation, and faceted dendrite growth are discussed on the basis of the experimental results of in situ observations.

Crystal growth mechanisms of silicon during melt growth processes

2012 ◽  
Author(s):  
K. Fujiwara ◽  
H. Koizumi ◽  
K. Nozawa ◽  
S. Uda
Keyword(s):  
Crystal Growth ◽  
Growth Mechanisms ◽  
Growth Processes ◽  
Melt Growth

Crystallite coalescence: A mechanism for intrinsic tensile stresses in thin films

1999 ◽  
Vol 14 (8) ◽  
pp. 3467-3473 ◽  
Author(s):  
W. D. Nix ◽  
B. M. Clemens
Keyword(s):  
Grain Size ◽  
Film Growth ◽  
Free Energies ◽  
Growth Morphology ◽  
Island Growth ◽  
Tensile Stresses ◽  
Stages Of Growth ◽  
Side Walls ◽  
Thin Polycrystalline ◽  
Interfacial Free Energies

We examined the stress associated with crystallite coalescence during the initial stages of growth in thin polycrystalline films with island growth morphology. As growing crystallites contacted each other at their bases, the side-walls zipped together until a balance was reached between the energy associated with eliminating surface area, creating a grain boundary and straining the film. Our estimate for the resulting strain depends only on interfacial free energies, elastic properties, and grain size and predicts large tensile stresses in agreement with experimental results. We also discuss possible stress relaxation mechanisms that can occur during film growth subsequent to the coalescence event.

scholarly journals Synthesis of magnesium carbonate hydrate from natural talc

2020 ◽  
Vol 18 (1) ◽  
pp. 951-961
Author(s):  
Qiuju Chen ◽  
Tao Hui ◽  
Hongjuan Sun ◽  
Tongjiang Peng ◽  
Wenjin Ding
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Crystal Growth ◽  
Crystal Morphology ◽  
Magnesium Carbonate ◽  
Organic Additives ◽  
X Ray Diffraction ◽  
Morphological Transformation ◽  
X Ray ◽  
Carbonation Process

AbstractVarious morphologies of magnesium carbonate hydrate had been synthesized without using any organic additives by carefully adjusting the reaction temperature and time during the talc carbonation process. At lower temperatures, magnesium carbonate hydrate was prone to display needle-like morphology. With the further increase of the carbonation temperature, the sheet-like crystallites became the preferred morphology, and at higher aging temperatures, these crystallites tended to assemble into layer-like structures with diverse morphologies, such as rose-like particles and nest-like structure. The reaction time had no effect on the crystal morphology, but it affected the particle size and situation of the crystal growth. X-Ray diffraction results showed that these various morphologies were closely related to their crystal structure and compositions. The needle-like magnesium carbonate hydrate had a formula of MgCO3·3H2O, whereas with the morphological transformation from needle-like to sheet-like, rose-like, and nest-like structure, their corresponding compositions also changed from MgCO3·3H2O to 4MgCO3·Mg(OH)2·8H2O, 4MgCO3·Mg(OH)2·5H2O, and 4MgCO3·Mg(OH)2·4H2O.

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