# Talk:Calcium

According to the handbook of chemistry and physics 95th edition (CRC Press), face-centered cubic calcium turns into body-centered cubic above 443°C and not hexagonal as mentionned in the article. This is also written in this abstract (here: https://iopscience.iop.org/article/10.1149/1.2430364/meta) from 1956 (but for a temperature of 464°C). Fullmetalgrudo (talk) 13:42, 28 January 2024 (UTC)

Thanks Fullmetalgrudo, I find other recent authoritative sources agree with your post and updated the article to state that it changes from fcc to bcc as you note. The source I used (Arblaster 2018) says that publications from 1956 and 1958 "reported an intermediate hexagonal close-packed (hP2) structure but Peterson and Fattore 1961 showed that this was due to hydrogen contamination." –MadeOfAtoms (talk) 10:08, 20 April 2024 (UTC)
@MadeOfAtoms 205.250.46.4 (talk) 07:26, 7 October 2025 (UTC)

One application I had read about elsewhere in Wikipedia which I didn't see on this page is that calcium can be alloyed with magnesium to prevent it from catching fire; while alloying aluminum with magnesium also reduces the risk of catching fire, such alloys can still catch fire at very high temperatures, while a suitable alloy with calcium would not catch fire under any circumstances. Quadibloc (talk) 14:17, 26 June 2024 (UTC)

I checked "Magnesium Alloys" (doi 10.1002/14356007.a15_581).  No mention of Ca-Mg alloys.--Smokefoot (talk) 18:56, 27 June 2024 (UTC)

I removed the mention that the other four natural isotopes are "significantly rarer" than 40Ca and 44Ca, because it was stating the obvious; since 40Ca has abundance ~96.4% and 44Ca has abundance ~2.8%. Okay? Solomonfromfinland (talk) 18:48, 14 June 2025 (UTC)

I strongly object to forcing readers to compare numbers in different paragraphs when a simple few-word transisition helps them focus on the comparison. See also parallel construction as a good writing technique. DMacks (talk) 19:44, 14 June 2025 (UTC)

The redirect Ca+2 has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at Wikipedia:Redirects for discussion/Log/2025 August 7 § Calcium ion until a consensus is reached.  1234qwer1234qwer4 02:53, 7 August 2025 (UTC)