[volt-nuts] Thermal EMF of solder alloys - upd. october 2016

[Andrea Baldoni]

Hello.
Thank to the contribution of Dan Kemppainen, Herbert Poetzl and Andreas Bergman,
I had the opportunity to test more alloys. As before, a really low EMF (< 2uV/K)
hasn't been identified.

Measurements have been done between water ice point and boiling point with
Agilent 34401A.
I don't expect the curves be linear, but here it's assumed they are.
All experiments have been repeated.

Copper - Sn96.5/Ag3/Cu0.5 -> 3.35uV/K (first experiment)
Copper - Sn96.5/Ag3/Cu0.5 -> 3.38uV/K (second experiment)
Copper - Sn95.5/Ag3.8/Cu0.7 -> 3.22uV/K (first experiment)
Copper - Sn95.5/Ag3.8/Cu0.7 -> 3.25uV/K (second experiment)
Copper - Sn60/Pb40 -> 3.34uV/K (first experiment)
Copper - Sn60/Pb40 -> 3.35uV/K (second experiment)
Copper - Pb92.5/Sn5/Ag2.5 -> 3.02uV/K (first experiment)
Copper - Pb92.5/Sn5/Ag2.5 -> 3.05uV/K (second experiment)
Copper - Sn99.3/Cu0.7 -> 3.43uV/K (first experiment)
Copper - Sn99.3/Cu0.7 -> 3.45uV/K (second experiment)
Copper - Sn96/Ag4 -> 3.33uV/K (first sample, first experiment)
Copper - Sn96/Ag4 -> 3.32uV/K (first sample, second experiment)
Copper - Sn96/Ag4 -> 3.28uV/K (second sample, first experiment, thanks to Andreas)
Copper - Sn96/Ag4 -> 3.24uV/K (second sample, second experiment, thanks to Andreas)
Copper - Sn97/Cu3 -> 3.48uV/K (first experiment)
Copper - Sn97/Cu3 -> 3.44uV/K (second experiment)
Copper - Sn88.6/Cu1.8/Ag9.5/Au0.1 -> 3.05uV/K (first experiment, thanks to Andreas)
Copper - Sn88.6/Cu1.8/Ag9.5/Au0.1 -> 3.04uV/K (second experiment, thanks to Andreas)
Copper - Sn95.5/Cu0.7/Ag3.8 -> 3.28uV/K (first experiment, thanks to Andreas)
Copper - Sn95.5/Cu0.7/Ag3.8 -> 3.27uV/K (second experiment, thanks to Andreas)
Copper - Sn42/Bi57.6/Ag0.4 -> 4.43uV/K (first experiment, thanks to Herbert)
Copper - Sn42/Bi57.6/Ag0.4 -> 4.46uV/K (second experiment, thanks to Herbert)
Copper - Sn100C (Sn-Cu-Ni+Ge) -> 3.45uV/K (first experiment, thanks to Dan)
Copper - Sn100C (Sn-Cu-Ni+Ge) -> 3.41uV/K (second experiment, thanks to Dan)

Copper - Brass -> 3.30uV/K

The best one keeps to be the Pb92.5/Sn5/Ag2.5, the best between the lead
free ones is the Sn88.6/Cu1.8/Ag9.5/Au0.1.

If someone has other alloys to suggest me to test I'll be happy to do it.

I'll be very happy to pass all the samples to a fellow who wish to repeat
the experiment, provide that he/she will post results here and in turn, will
pass everything to the second one who will do the same.

Best regards,
Andrea Baldoni