Why is Sn a better conductor than Pb?

[Sleek_]

Homework Statement

Hi guys, I'm currently writing an extended essay in Physics looking at the effect of percentage composition of Sn has on the electrical resistivity of SnPb Solder. I've noticed that Sn is listed as being a better conductor than Pb, despite trends of periodicity and have been trying to find an explanation for it.

2. The attempt at a solution
I've haven't really found much for a concrete answer, but I've been able to piece together that it has something to do with electron-phonon coupling, and that the amount of vibrations in the lattice allow Sn to conduct better but am still largely unsure as to how this process works.

If any of you super knowledgeable ones would be able to help me out, I'd be really grateful! :)

 

[scottdave]

Lead and Tin are in the same group, but maybe the larger atom has something to do with the amount of energy necessary to allow the valence electrons to conduct.
Take a look at these articles. It doesn't really answer the question, but maybe somewhere to look.

https://sites.google.com/a/hartdist...s/21-3-band-theory-of-electrical-conductivity

https://www.thebalance.com/electrical-conductivity-in-metals-2340117

 

[rude man]

A simplified (non-q/m) explanation involves a wave theory; the "correct" one is based on quantum mechanics.
cf. https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity