“…Considering an electrical conductivity σ powder =1×10 -5 S.m -1 at 390°C (Giridhar et al, 1990), i.e ρ powder = 1×10 5 Ω.m and ρ die = 20×10 -6 Ω.m, l die =30mm, l powder =1.5mm, Ø die =25mm and Ø powder =8mm, we end with → . The macroscopic current is therefore mostly driven by the graphite die.…”