Quenching the Doped Sample

In the first photograph a sample of Selenium doped with Nickel is carefully pushed out of the rocking furnace into a container of liquid nitrogen. After melting and rocking in the furnace, the melted metal is nearly uniform throughout the sample. Qui ck cooling, or quenching, in the liquid nitrogen preserves the crystal structure. The quartz tube containing the sample amazingly withstands the extreme temperature range. Next the conductivity and resistance must be measured.

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