User talk:Double sharp/Crystallographic properties of the elements

Some shrinkage may occur

Double sharp: I appreciate that you dug out all these thermal expansions. That's remarkable how much Gd shrinks along the c axis when it's warmed through the Curie point near 20 °C. –MadeOfAtoms (talk) 11:21, 6 February 2024 (UTC)

@MadeOfAtoms: Yeah, that temperature is maybe not too representative for this element.

A few notes:

1. There's no thermal expansion data for helium (the only element that refuses to solidify at ambient pressure).
2. The available experimental data for α-B thermal expansion is too poor to say anything other than that the expansion varies erratically, so Arblaster declined to give a value.
3. The lattice parameters and thermal expansion for β-F₂ are all estimated – and, in the case of thermal expansion, apparently based on noting that it ought to be similar to isostructural γ-O₂. Experimental data does exist for lattice parameters, but it is low in accuracy (can you really blame anyone for this, though?).
4. The lattice parameters and thermal expansion for Pm are estimated (though again low-accuracy data for lattice parameters exist), based on comparisons with isostructural Pr and Nd and the fact that Pm should behave quite like a 50-50 Nd-Sm alloy does. (Hurray for the similarity of the lanthanoids!)
5. There is no experimental data at all for At, Rn, Fr, Fm, Md, No, and Lr. The reasons are obvious. Everything there is an estimate.

Double sharp (talk) 12:07, 6 February 2024 (UTC)

I added some phase transitions and melting points. Double sharp (talk) 16:15, 6 February 2024 (UTC)

Tin lattice constants

Double sharp: There's a typo in the β-Sn lattice constant given by Arblaster (2018) in Appendix B (gives incorrect a = 0.58513 nm) where the book on pg 386 gives the correct value (a = 0.58313 nm). (I got my own copy of Arblaster now :-) ). Found this typo by checking consistency with density. Also the thermal expansion for β-Sn is anisotropic, but your table gives only α_a at present. I'd be glad to update details like this as I find them, am but asking permission first before perturbing your sandbox. Thanks again for this mass of reference data! –MadeOfAtoms (talk) 23:44, 16 March 2024 (UTC)

@MadeOfAtoms: Sure, go ahead and fix it! :D Double sharp (talk) 04:17, 17 March 2024 (UTC)