Dear Dr Norbert. M Nemes 

you can use this geometry (Disks of 8.3 mm in diameter and 1.5 mm thick and

bars of about 1.5 mm × 3 mm × 12 mm were cut and

polished from the pressed disks) for the thermoelectric

properties characterization.  Also, you can  you can check these papers

 Dear Dr. Abuelwafa,

Thank you for your response and the linked papers. Unfortunately, I only see the Harman-technique used in the first one, and that reports on thin-film samples. Now, I understand that characterising thin-films is much more challenging and interesting. But my question is simply, how to employ the Harman-technique on plentiful bulk samples.

Kind regards,

 Dear Dr. Melnikov,

Thank you for your detailed answer. This is very useful. We are using an ac current source with a nanovoltmeter, and record the V(t) time dependence for each current direction, in order to distinguish (perhaps?) Joule vs. Peltier type heating.