Talk:Silicon nitride

Stacking order
I believe the alpha and beta stacking descriptions are reversed, since thats what we are learning in class. I am changing it.Sirkha 17:43, 15 September 2006 (UTC)

MOS recommends against "Math" font

 * preferred:
 * 3 Si + 2N2 →  Si3N4
 * less preferred:
 * $$\mathrm{3 \ SiO_2 + 6 \ C + 2 \ N_2 \longrightarrow \ Si_3N_4 + 6 \ CO}$$,


 * See Manual_of_Style_(chemistry)

--Smokefoot (talk) 13:13, 26 April 2009 (UTC)

Missing
I am amazed no one included or inquired about the dielectric constant of this material, which is one of the key reasons for its use in semiconductor devices. Many other electrical parameters also seem to be missing. —Preceding unsigned comment added by 12.229.112.98 (talk) 21:56, 11 March 2010 (UTC)
 * Please help us adding that information. I thought it is used in semiconductors industry because of compatibility with silicon, not because of dielectric constant, isn't it? Materialscientist (talk) 23:46, 11 March 2010 (UTC)

Properties
What is color of pure silicon nitride? It (probably) has a band gap of 5,1 eV, therefore it should be transparent and colorless. Many pictures shows metallic-looking substance named as silicon nitride. It is a "semimetalloidal" substance such as diamond, with very high hardness and melting point, but wide band gap and poor electrical conductivity.

95.49.56.52 (talk) 19:57, 2 November 2013 (UTC)

Same question. On the webminaral.com/... site it is said that as meteorite mineral it can be colourless and transparent (in the visible spectrum) (just like silicon carbide aka moissanite) but this may only apply to the microscopic grains that where found. I couldn't find any examples of high quality single crystalline samples that where in the 1mm range in all three dimensions. I mainly found A) sintered material (~6mm diameter balls) which are very likely grey/black due to faults/inclusions/... and B) very thin high quality films like the in an silicon frame suspended one in this paper. This paper says that there's a damping of 2e-4 on 50nm which equates to a quite significant reduction to ~67% on only 0.1mm. Inconsistently the filmetronics site says that it is near transparent at 632.8nm (extinction coefficient 0 ??)

--Login Mechadense (talk) 11:56, 12 December 2015 (UTC)

As is the case with many technical ceramics, the only way they can be macroscopically transparent is if the grain size is very large (eg single crystals) or very small. Also any left porosity will scatter light. These are the reasons why sintered silicon nitride is opaque (usually dark grey to light grey). Ezrado (talk) 17:57, 12 December 2015 (UTC)

Refractive index and wavelength
A refractive index is listed - but the wavelength at which this refractive index applies seems to be missing. Given that the refractive index varies from roughly 2.08 to 2.0 in the visible spectrum it seems excessive that the refractive index listed presently is given with a precision of 3 decimal numbers. Either reduce precision or (preferably) indicate wavelength. Source: http://refractiveindex.info/?group=CRYSTALS&material=Si3N4. — Preceding unsigned comment added by 192.38.90.48 (talk) 18:16, 27 February 2014 (UTC)
 * Clicking on the reference will bring you to the wavelength also. Refractive index is traditionally specified for the yellow doublet sodium D line (589 nm). Materialscientist (talk) 00:05, 28 February 2014 (UTC)

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Chart Information Not Explained
This figure from the article shows tensile strength vs. temperature. The article should explain the figure, or the figure should have an explanatory caption. From the figure I find there are two versions of silicon nitride (1980 and 1997). But the article describes 3 versions (α, β and γ phases). I would guess that some advance was made to increase the strength but I could not find backing information in the history section or the properties section. — Preceding unsigned comment added by Ericjster (talk • contribs) 23:52, 17 December 2018 (UTC)
 * Please explain the difference between 1980 and 1997 versions of Si3N4
 * Please explain what happened prior to 1980
 * Please relate the figure to α, β and γ phases

Requested move 4 February 2022

 * The following is a closed discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review after discussing it on the closer's talk page. No further edits should be made to this discussion. 

The result of the move request was: no consensus. (closed by non-admin page mover) Colin M (talk) 19:33, 21 February 2022 (UTC)

Silicon nitride → Trisilicon tetranitride – This article is about trisilicon tetranitride. The introductory sentence is the exception; it can be put in its own article about general silicon-nitrogen compounds titled Silicon nitride, and if possible focus on other such compounds. But this article in general is almost exclusively about trisilicon tetranitride. Georgia guy (talk) 18:35, 4 February 2022 (UTC) — Relisting. Extraordinary Writ (talk) 04:31, 12 February 2022 (UTC) The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.
 * Oppose. Si3N4 is commonly referred to as "silicon nitride" as it is by far the most common, as explained in the lead, and we should follow WP:COMMONNAME. Other group-14 nitrides would be name similarily (e.g. germanium nitride). However, I do think that Trisilicon tetranitride should be made into a redirect. Mdewman6 (talk) 18:30, 5 February 2022 (UTC)

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