Talk:Crystal twinning

Twin Boundary
This paragraphs seems to me to be thoroughly misleading, though I'm not expert enough in the topic to edit it. I hope someone will. The impression is given that the difference in orientation of the two crystals sharing a twin boundary is necessarily slight. That's only a very special case (called "pseudo-merohedry" ). In general, there is NO distinction between a "twin boundary" and a "grain boundary". It is NOT TRUE that "grain boundaries ... form when crystals of ARBITRARY orientation grow together". There is nothing arbitrary about mis-orientations across grain/twin boundaries. The possible relative orientations of two crystal lattices sharing a boundary is a branch of group theory with an extensive literature.

Moreover, the description of "inter-penetrating twins" is also misleading. Crystals do not inter-penetrate - they only sometimes look as if they do! Ericlord (talk) 14:33, 16 March 2009 (UTC)


 * Grain boundary is generally taken to mean a plane across which crystalline order is not preserved. This can include a boundary produced by the concentration of defects and/or inhomogeneous material, which would constitute a case entirely distinct from a twin boundary, and the relative orientation of the faces of adjacent grains can be entirely arbitrary. —Preceding unsigned comment added by 131.215.115.31 (talk) 19:32, 11 August 2010 (UTC)
 * Defects are excluded (no crystal is homogeneous with respect to that if to look with proper techniques). Materialscientist (talk) 22:54, 11 August 2010 (UTC)

Twinning in FCC structures
I removed the following statement: "FCC structures will not usually twin because slip is more energetically favorable.", which does not account for twinning in FCC materials which have low stacking fault energy, like Fe-Mn steels, and for which twinning is one important deformation mechanism. In these materials, twinning might be as energetically favourable as dislocation glide. —Preceding unsigned comment added by Marechad (talk • contribs) 21:14, 26 September 2010 (UTC)

Suggestions
misc: I think that the images are not displaying correctly. Some of them are skipped over when being displayed and the next/previous buttons are pressed. That or the computer i am using is a vegetable.

It would be nice to have a discussion of what twinning boundaries look like at the level of unit cells. For example, could someone make a figure showing unit cells in two different tiling arrangements? Spencer Bliven (talk) 20:05, 5 October 2011 (UTC)

Orphaned references in Crystal twinning
I check pages listed in Category:Pages with incorrect ref formatting to try to fix reference errors. One of the things I do is look for content for orphaned references in wikilinked articles. I have found content for some of Crystal twinning's orphans, the problem is that I found more than one version. I can't determine which (if any) is correct for this article, so I am asking for a sentient editor to look it over and copy the correct ref content into this article.

Reference named "KleinHurlbut1993": From Jadeite:  From Plagioclase:  From Niter:  

I apologize if any of the above are effectively identical; I am just a simple computer program, so I can't determine whether minor differences are significant or not. AnomieBOT ⚡ 23:39, 19 February 2022 (UTC)

A Commons file used on this page or its Wikidata item has been nominated for deletion
The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion: Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 15:24, 22 October 2022 (UTC)
 * Twinforescatter diode.tif

Typo
It may not seem like a typo, and my change may not change the appearance of the page, but I fixed a coding typo – there was no space on either side of a file (photo). When automated spellcheckers scan Wikipedia pages, they skip the files including the brackets, which then makes it seem that there is no space following the period. Adding a space either before or after the file (brackets) can solve this problem, but it can also cause an indentation problem. Starting a new paragraph with the file and a new line with the text prevents this. The appearance may not change at all, but it's better coding. Thanks for understanding. Ira Leviton (talk) 23:06, 13 March 2023 (UTC) –


 * @Ira Leviton it is not a typo still. See Scattered electron imaging article. Can you please put it back? FuzzyMagma (talk) 06:42, 14 March 2023 (UTC)


 * Maybe we are talking about different things? I inserted a hard return and space after a period but I don't see a difference in the page appearance.  Did I do something else that I'm not aware of or don't see? Ira Leviton (talk) 10:38, 14 March 2023 (UTC)
 * @Ira Leviton you removed an acronym, i.e., FSD FuzzyMagma (talk) 11:48, 14 March 2023 (UTC)
 * Never mind I put it back ., sorry to labour the point since you clearly did not intentionally remove the acronym …FuzzyMagma (talk) 11:52, 14 March 2023 (UTC)