Realization of the Freezing Points Of Indium, Tin and Zinc Using Stainless Steel–Cased Cells

Document(s): 

Realization of the Freezing Points Of Indium, Tin and Zinc Using Stainless Steel–Cased Cells (199.26 KB)

Realization of the freezing points of indium, tin and zinc using new stainless steel–cased cells is reported. The stainless steel–cased cells were compared against classic fused silica–cased cells, and the differences between them were within 0.2 mK for all three fixed points. The long-term stabilities of the new cells were checked after about one year of use and no obvious drifts have been detected. The expanded uncertainty (k=2) was estimated to be 0.7 mK for the indium point, 0.8 mK for the tin point, and 1.0 mK for the zinc point. It was tried to simplify the fixed-point realization by using a small portable furnace and melting plateau for “secondary” calibrations with just a little larger uncertainty.