Talk:Palladium

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Contents 1 Telecommunications uses 2 Conflicting info 3 Featured Article? 4 Clathrate 5 107Ag 107Pd 6 Photography 7 Electron Shells

[edit] Telecommunications uses

Hi, in the "Applications" section, the bullet point "Telecommunications switching-system equipment uses palladium." seemed a little vague. (It made me wonder where, how and why it was used.) So I googled around a bit and came up with some more specific uses. I hope that's allright. I couldn't find anything specific to telecomm switches though... please provide more specific info if you have any. Infinoid 17:55, 19 August 2006 (UTC)

Palladium was/is used in the contact points of relays to reduce pitting caused by electrical arcs which occur when the relay contact is opened while the circuit is under power. Pd alloyed contacts are used in some motor starter relays. The information with regard to telecommunication switching systems is no longer vaild in the US as these systems no longer use relays using instead solid-state components [computers]. Drrocket 15:02, 3 January 2007 (UTC)

[edit] Conflicting info

The article says this at one point: "Palladium is one of the two metals which can be alloyed with gold to produce White gold. (Nickel can also be used.)"

Which conflicts with the page on White Gold which claims that it can be made by Gold alloyed with Silver as well.

I would think that it should be changed to indicate that Palladium is one of many or that Pd, Ni and Ag are the most commonly used. Pt, Pd, Ir, Rh and Ni all work well to de-colorize Gold. Never tried Os or Ru so I could not say if they will do so... Drrocket 01:54, 24 November 2006 (UTC)

[edit] Featured Article?

I've cleaned up the references and external links, converting the ext links to citations. I also cleaned up the list and turned it into prose. Perhaps we can find the remaining citations and then submit it for peer review, then FAC? --Rifleman 82 20:20, 4 February 2007 (UTC)

[edit] Clathrate

Under the Characteristics heading the following statement is present:

It is thought that this possibly forms palladium hydride (PdH2) but it is not yet clear if this is a true chemical compound.

I find the above statement unsatisfactory - if it can not be defined more precise e.g.:

It is thought that this possibly forms palladium hydride (PdH2) or a clathrate. However, it is not yet clear exactly what chemical entity is formed.

then the statement should be deleted.

• R. Lässer, K. -H. Klatt (1983). "Solubility of hydrogen isotopes in palladium". Physical Review B 28: 748 - 758. DOI:10.1103/PhysRevB.28.748. 
• T. B. Flanagan, W. .A Oates (1991). "The Palladium-Hydrogen System". Annual Review of Materials Science 21: 269-304. DOI:10.1146/annurev.ms.21.080191.001413. 
• X. W. Wang, S. G. Louie, M. L. Cohen (1989). "Hydrogen interactions in PdH_n (1≤n≤4)". Physical Review B 40: 5822 - 5825. DOI:10.1103/PhysRevB.40.5822. 
• Z. Sun, D. Tománek (1989). "Cold fusion: How close can deuterium atoms come inside palladium?". Physical Reviews Letters 63: 59 - 61. DOI:10.1103/PhysRevLett.63.59. 
• L. Schlapbach, A. Zütte (2001). "Hydrogen-storage materials for mobile applications". Nature 414: 353-358. DOI:10.1038/35104634. 

This are some references to hydrogen and palladium compounds, but non of them mentiones the PdH₂ as something special.--Stone 10:33, 12 February 2007 (UTC)

[edit] 107Ag 107Pd

• J. H. Chen, G. J. Wasserburg (1990). "The isotopic composition of Ag in meteorites and the presence of 107Pd in protoplanets". Geochimica et Cosmochimica Acta 54 (6): 1729-1743. DOI:10.1016/0016-7037(90)90404-9. 

This review like article could be used as source, but I have to read it first.--Stone 10:46, 12 February 2007 (UTC)

This might be the original report from 1978.

• Kelly, W.R. and Wasserburg, G.J. (1978). "Evidence for the existence of 107Pd in the early solar system". Geophys. Res. Lett. 5: 1079–1082. 

--Stone 10:50, 12 February 2007 (UTC)

[edit] Photography

[1] this is a howto for palladium photography.--Stone 09:18, 15 February 2007 (UTC)

• Mike Ware (1986). "An Investigation of. Platinum and Palladium Printing". Journal of Photographic Science 34 (5-6): 165-177.  --Stone 09:22, 15 February 2007 (UTC)

[edit] Electron Shells

Does anyone know how palladium has an empty outer shell while the second in shell contains 18 electrons.Sk8tuhpunk 03:07, 25 March 2007 (UTC)