User:Praseodymium-141/Samarium
= Certain.
= Probably.
Comments by Sandbh
[edit]1. Standard atomic weight Ar°(Sm) 150.36±0.02 150.36±0.02 (abridged)[1]
I do not understand the need for two entries for atomic weight nor the mention of "abridged". Citation 1 does not use this term.
6. An entry for 145Sm is missing (half-life 340 days). The half-life for 146Sm does not check out; the source lists it as 68 My. There is no consistency in rounding of abundances and half-lives.
Removed
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8. This source supports the listed boiling point of Sm. i do not understand why it is required since source 10 says the same thing.
9. This source is linked to the 81st (2000) edition of the CRC Handbook but the WP entry strangely says it is for the edition of "2004-06-29", whatever that means. The entry in the CRC Handbook does not support the WP statement that, "samarium is the third most volatile lanthanide after ytterbium and europium and comparable in this respect to lead and barium; this helps separation of samarium from its ores."
10. "Samarium is calculated to have one of the largest atomic radii of the elements; with a radius of 238 pm, only potassium, praseodymium, barium, rubidium and caesium are larger."
The citation only partly checks out. It only covers from He to Rn. Potassium, praseodymium, barium, rubidium and caesium are indeed larger. I note La and Ce have larger radii shown in parentheses. The paper does not explain what the parentheses mean.
- I do not have access to the source. The reference is also used here, where La and Ce have smaller radii. I don't know though. 141Pr {contribs} 16:46, 30 May 2023 (UTC)
11. Is noted below and does not check out.
- a b c d Shi, N.; Fort, D. (1985). "Preparation of samarium in the double hexagonal close packed form". Journal of the Less Common Metals. 113 (2): 21. doi:10.1016/0022-5088(85)90294-2.
Here:
- a = a tetragonal phase appearing at about 900 kbar.
- b = Thin films of samarium obtained by vapor deposition may contain the hcp or dhcp phases in ambient conditions.
- c = trigonal samarium
- d = hexagonal samarium
Item b is indeed mentioned by Shi & Fort. However they say nothing in support of a, c and d that I could see.
17. "Samarium is quite electropositive and reacts slowly with cold water and rapidly with hot water to form samarium hydroxide:"
The citation is to Webelements. Retrieved 2009-06-06. A more reliable source is needed.
19. "Samarium is one of the few lanthanides with a relatively accessible +2 oxidation state, alongside Eu and Yb."
This citation is factually correct but incorrectly sourced. The source is given as "Stephen T. Liddle; David P. Mills; Louise S. Natrajan, eds. (2022). The lanthanides and actinides: synthesis, reactivity, properties and applications. London. p. 213". The source is actually to a chapter in the book, namely "Organometallic Chemistry of Lanthanides" by Wenliang Huang and Paula L. Diaconescu, pp. 209 to 310.
Comments by Praseodymium-141
[edit]20-23
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20. Source says: The coordination chemistry in this oxidation state is essentially confined to the ions SmII, EuII and YbII. These are the only ones with an aqueous chemistry and their solutions may be prepared by ... These solutions are blood-red for SmII...
21. Source says: At about 91 GPa samarium transforms to a body-centered tetragonal structure...
22. Don't have access to the source. From the abstract, it says "For Ln=La,Ce,Pr, Nd, Sm, a face-centered cubic compound is obtained from each reaction. The cell parameters are respectively 5.144, 5.089, 5.031, 4.994, and 4.943 ± 0.005A˚. The compounds appear golden yellow with a metallic luster."
23. Again I don't have access to the source. From the abstract, it says: Structures and Raman spectra of lanthanide sesquioxide single crystals with A-type trigonal structure (La2O3, Pr2O3, Nd2O3, Sm2O3) and B-type monoclinic structure (Sm2O3, Eu2O3, Gd2O3) are compared. The B form (C32h or C2m, Z=6) derives from the A form (D33d or P3m1, Z=1) by a slight lattice deformation, implying a splitting of D3d and C3v atomic positions into less symmetrical C2h and Cs sites.
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24. Don't have access at all.
25. Don't have access. Here the abstract doesn't really tell much about it.
26. Don't have full access. Hexagonal does not be seem to be said in the source.
27. Don't have access at all. The title seems to be talking about its structure at least.
28
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28. In abstract: High pressure, high temperature techniques have been used to synthesize SmB2 and GdB12. The diboride has a hexagonal AlB2-type structure and the dodecaboride has a cubic UB12-type structure. Lattice parameters are a = 3.31 A, c = 4.019 A ...
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29. Don't have access. The abstract doesn't say much.
30. Don't have access. Might have structres on SmB4, SmB6 and SmB66 but I'm not sure.
31. Don't have access.
32. Don't have access. Definitely talks about SmC2, not so sure about Sm2C3.
33
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34. Abstracts shows that it is about the right topic. Unable to verify, though.
35
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36. Don't have access.
37. Don't have access.
38. Don't have access, probably shows though.
39. Don't have access.
40. Don't have access.
41. Don't have access.
42-43
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42. 43. |
44. Don't have access.
45. Not sure.
46
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47. Don't have access (right now).
48-49
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48. 49. |
50. Don't have access.