For vulcanization of rubber.
(L. tellus, earth) Discovered by Muller von Reichenstein in 1782; named by Klaproth,
who isolated it in 1798.
Tellurium is occasionally found native, but is more often found as the telluride of
gold (calaverite), and combined with other metals. It is recovered commercially from the
anode muds that are produced during the electrolytic refining of blister copper. The U.S.,
Canada, Peru, and Japan are the largest Free World producers of the element.
Crystalline tellurium has a silvery-white appearance, and when pure exhibits a metallic
luster. It is brittle and easily pulverized. Amorphous tellurium is found by precipitating
tellurium from a solution of telluric or tellurous acid. Whether this form is truly
amorphous, or made of minute crystals, is open to question. Tellurium is a p-type
semiconductor, and shows greater conductivity in certain directions, depending on
alignment of the atoms.
Its conductivity increases slightly with exposure to light. It can be doped with
silver, copper, gold, tin, or other elements. In air, tellurium burns with a greenish-blue
flames, forming the dioxide. Molten tellurium corrodes iron, copper, and stainless steel.
Tellurium and its compounds are probably toxic and should be handled with care. Workmen
exposed to as little as 0.01 mg/m3
of air, or less, develop "tellurium breath," which has a garlic-like odor.
Thirty isotopes of tellurium are known, with atomic masses ranging from 108 to 137.
Natural tellurium consists of eight isotopes.
Tellurium improves the machinability of copper and stainless steel, and its addition to
lead decreases the corrosive action of sulfuric acid on lead and improves its strength and
hardness. Tellurium is used as a basic ingredient in blasting caps, and is added to cast
iron for chill control. Tellurium is used in ceramics. Bismuth telluride has been used in
Tellurium costs about $100/lb, with a purity of about 99.5%.