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Tellurium is one of the major constituents of II-VI compound semiconductors. The high purity (HP) tellurium is required for preparation of the compound semiconductors. The tellurium based semiconductor devices are used in infrared (IR) detectors, solar cells, thermo-electric coolers, etc. These devices are mainly used in strategic electronics such as defense, space, etc.
Purification was done by electro-refining, vacuum distillation and zone refining. Majority of impurities are removed by electro-refining and vacuum distillation and analyzed by atomic absorption spectrometry (AAS).
The impurities at ppb/ ppt level are removed by zone refining and analyzed by Mass spectrometry such as GDMS.The raw tellurium (3N pure) was kept in a graphite crucible and distilled under dynamic vacuum.
The material deposited over the water cooled SS fingers was then subjected to ICP–OES analysis. The overall purity of trace impurity elements except selenium . The gaseous impurities like oxygen and nitrogen in vacuum distilled tellurium was analyzed on LECO make nitrogen/oxygen determinator and observed both .
The Global High Purity Tellurium Market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Tellurium is used in the electronics industry due to its unique electrical and thermal-conductive properties. It can be found in thermo-electric materials, such as bismuth telluride (BITE) cooling devices, as well as infrared sensors and cadmium telluride (CDTE) photovoltaic cells.
Another tellurium alloy, cadmium zinc telluride (CDZNTE), is used to produce solid-state x-ray detectors. SMI Ltd. supplies high purity tellurium ingots and granules (1-6mm) from purities of 99.99% min.
High Purity Tellurium TE 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 reacts 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 99.999%, 99.9999%, 99.99999% and 99.999995% grade by vacuum distillation and zone refining purification or crystal pulling growth method, piezoelectric crystal, and other basic materials, as well as evaporation source for MBE growth.
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, Cd1−xZnxTe 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
