Talk:Metal
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Sulfur nitride - a metal molecular compound[edit]
I removed sulfur nitride from the lede. It's considered a non-metal with some metallic properties. Its inclusion as a metal contradicts a) this article, b) the sulfur nitride article c) formal reference works on the topic. Its original inclusion in 2019 was unreffed. Ordinary Person (talk) 04:47, 12 June 2022 (UTC)
Other metal molecular compounds[edit]
Are there less controversial metal (or metallic) molecular compounds ? - Rod57 (talk) 12:10, 12 March 2024 (UTC)
Hyper link edit request[edit]
The introduction discusses the "malleable" property of metal, but the hyperlink redirects to the "Ductility" page instead. Aeronchair (talk) 06:54, 18 August 2023 (UTC)
- That is because malleability does not have a standalone article. It instead redirects to ductility, an article which discusses both properties, so the link is not broken. Complex/Rational 11:47, 18 August 2023 (UTC)
Physical science[edit]
About uses of metals in our daily life 49.204.1.11 (talk) 14:51, 16 October 2023 (UTC)
Small typo in "Quasicyrstalline alloys"[edit]
Change to "Quasicrystalline" Pingohits (talk) 16:11, 8 December 2023 (UTC)
Graphite - is it a metal[edit]
Can we clarify if graphite is considered a metal, Since it conducts electricity moderately well and seems to have the general characteristics (of a metal) in the introduction. Or, Is it too soft to be a metal ? - Rod57 (talk) 12:17, 12 March 2024 (UTC)
Physics definition[edit]
Article says "In physics, a metal is generally regarded as any substance capable of conducting electricity at a temperature of absolute zero.[2]" - Is it "generally regarded" or just one persons idea ? It's a very theoretical definition rather than being something that can be tested or measured. If true, it would make all materials, while superconducting, metals. A more usual definition of a metal might be having free electrons in a conduction band ? - Rod57 (talk) 12:33, 12 March 2024 (UTC)
- The source is Nevill Mott. If you have another source, please let's have it. Johnjbarton (talk) 15:28, 2 May 2024 (UTC)
Electrical and thermal: Plutonium[edit]
The electrical and thermal section read, in part:
- "Plutonium increases its electrical conductivity when heated in the temperature range of around −175 to +125 °C, with anomalously large thermal expansion coefficient and a phase change from monoclinic to face-centered cubic near 100 °C."
The source was given as Hecker, Siegfried S. (2000). "Plutonium and its alloys: from atoms to microstructure" (PDF). Los Alamos Science. 26: 290–335.
Reading the source, it does not say anything about:
- Pu increasing its electrical conductivity when heated in the temperature range of around −175 to +125 °C; nor
- an "anomalously large" thermal expansion coefficient.
Nor did the article's citation give a page number/s specifying where the pertient facts were mentioned.
OTOH, Russell AM & Lee KL 2005, Structure-Property Relations in Nonferrous Metals, Wiley-Interscience, New York, p. 466, say that when Pu (a metal) is heated within a temperature range of 100 to 400K [–173 to 126.85 °C) conductivity increases.
The same source shows that the simple monoclinic phase of Pu is stable below 122 °C (p. 465).
I have therefore amended the mention of Pu to read...
- "Plutonium increases its electrical conductivity when heated in the temperature range of around −175 to +125 °C"
...and added a citation to Russel & Lee, with a page number.
Since the fact that Pu undergoes a phase change from simple monoclinic to body-centred monoclinic is not germane to the point about its unusual tempertaure coefficient of resistivity, I've removed it. --- Sandbh (talk) 13:03, 20 June 2024 (UTC)
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