Tellurium (Te) is purified using a multistage vacuum distillation technique. Specially designed quartz ampoules
coupled to a 10-6 torr vacuum system are used for one, two, and three stage distillations. The unique quartz design
allows removal of residual materials between stages without handling purified material or exposing it to atmospheric
conditions. Average deposition of purified material is 0.93 g/min at a distillation temperature of 525°C. The
average overall yield per stage is 84% for single stage distillation, 80% for two stages, and 76% for three stages.
Glow discharge mass spectrometry testing (GDMS) is used to analyze samples of purified tellurium. GDMS results
show 6N purity (99.9999%) is achieved after the three stage distillation process when starting with 4N+ pure
material.
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