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The article in general is very bad (I do my
PhD in crystallization) and needs several sections added:
- a simple description what crystal growth is and what causes it (links to other articles already existing)
- a more detailed description on HOW a crystal grows (growth mechanisms)
Casual observer here: I agree completely, and the first introductory paragraph of
Mechanisms of growthreally needs to be cleaned up. It's not a good introduction at all - it's short and dense, very technical, a bit random, and only mentions vapor growth. It seems like it was written in haste. Not to mention the last sentence ends with a colon. :) This article needs help, but I'm inexperienced in editing Wikipedia even though I have some background in
Crystal growth. I'd be willing to help, if needed.
2601:88:8100:7443:4DBD:72A7:ABE2:723B (
talk)
04:02, 23 April 2019 (UTC)reply
There a quite a few articles on aspects of crystals and Crystallization. I wonder to what degree some of these articles could be merged. For example, It seems that
crystal growth is quite closely related to
Crystallization (engineering aspects).
Work with samples and summaries at talk pages for discuss new structure and appends at each main article;
Work migrating and merging some content.
If this article is improved, cleaned (there are a lot of non-encyclopedic details and repeated content between articles), and make understandable to non-experts, it not need to merge with others: is a in-deep article to the "(only) crystal growth" subject.
It's too short. If someone, like me, for example, was looking for info on crystals and they came here, they would want more info on crystals.
Ptara517 (
talk)
23:38, 4 February 2008 (UTC)reply
While I believe the SEM of the silver growing is very interesting in an academic perspective, I wonder if this constitutes original research. Also I am not sure how useful the caption is in describing the interesting features such as nucleation sites and lattice steps.
Darkwraith (
talk)
17:30, 16 February 2010 (UTC)reply
Is this article adequate?
What portion of the keywords that categorize the papers in The Journal of Crystal Growth published by Elsevier does this article cover? Is this sufficient for an article that a reader might think gives an indication of what someone working on "crystal growth" might be studying now, or studied in the past? For example, should the role of growing large single crystals in the development of infra-red and heat detecting semiconductor sensors be mentioned? Should mention be made of mathematical theories for rate of crystal growth? Should mention be made of relevance to space studies? And so on. Adding a long list of "see also"s without explaining why they should be seen is a cop-out. I think that one of the worst dangers of WP is the use of a phrase as the title of an article that deals with just one or two items that fall within it.
Michael P. Barnett (
talk)
01:13, 22 December 2010 (UTC)reply
Adding physical model on diffusion controlled growth
We are two students(Bachelor Physics and Chemistry Master) and we would like to update this article and add more information. We thought about adding a part to diffusion controlled growth.
Thats what we would like to add:
Diffusion-control:
Very commonly when the supersaturation (or degree of supercooling) is high, and sometimes even when it is not high, growth kinetics may be diffusion-controlled, which means the transport of atoms or molecules to the growing nucleus is limiting the velocity of crystal growth. Assuming the nucleus in such a diffusion-controlled system is a perfect sphere, the growth velocity, corresponding to the change of the radius with time , can be determined with Fick’s Laws.
1. Fick' s Law: ,
where is the flux of atoms in the dimension of , is the diffusion coefficient and is the concentration gradient.
2. Fick' s Law: ,
where is the change of the concentration with time.
The first Law can be adjusted to the flux of matter onto a specific surface, in this case the surface of the spherical nucleus:
,
where now is the flux onto the spherical surface in the dimension of and being the area of the spherical nucleus. can also be expressed as the change of number of atoms in the nucleus over time, with the number of atoms in the nucleus being:
,
where is the volume of the spherical nucleus and is the atomic volume. Therefore, the change if number of atoms in the nucleus over time will be:
Combining both equations for the following expression for the growth velocity is obtained:
From second Fick’s Law for spheres the equation below can be obtained:
Assuming that the diffusion profile does not change over time but is only shifted with the growing radius it can be said that , which leads to being constant. This constant can be indicated with the letter and integrating will result in the following equation:
,
where is the radius of the nucleus, is the distance from the nucleus where the equilibrium concentration is recovered and is the concentration right at the surface of the nucleus. Now the expression for can be found by:
Therefore, the growth velocity for a diffusion-controlled system can be described as:
[Picture]
Concentration profile in a diffusion-controlled system for a spherical nucleus with radius , where is the concentration of atoms in the solid nucleus, is the concentration in the liquid right at the surface if the nucleus, is the equilibrium concentration in the liquid phase and is the distance from the nucleus where the equilibrium concentration is recovered.
FelixvF47 (
talk)
14:02, 30 May 2024 (UTC)reply