High Purity Tellurium Te 4N 5N 6N 7N 7N5, is an odorless and silvery white lustrous crystalline solid material with atomic weight 27.60, density 6.24g/cm³ and melting point is 449.8°C, and is soluble in sulfuric acid, nitric acid, aqua regia, potassium hydroxide and potassium cyanide solution, but insoluble in water and neutral solvent. Tellurium has no reaction with water or non-oxidative acid but react violently with the halogens to produce the tellurium halides. Tellurium is a p-type semiconductor and its conductivity is sensitive to light exposure. High purity tellurium in various forms is prepared to 99.99% 99.999%, 99.9999%, 99.99999% and 99.999995% grade by vacuum distillation and zone refining purification or crystal pulling growth method, which is primarily used in the manufacturing of II-VI compound semiconductor increasingly employed in a wide variety of electronic and optical devices like CdTe, Cd_1−xZn_xTe for nuclear radiation detection, photo refractivity, and IR and x-ray detectors, and become widely used for optical storage material, solar cells, thermoelectric conversion elements, refrigeration components, gas sensitivity, pressure-sensitive and light-sensitive, piezoelectric crystal, and other basic materials, as well as evaporation source for MBE growth.