Tellurium - For vulcanization of Rubber
http://pearl1.lanl.gov/periodic/elements/52.html
Kettering and Tetraethyl Lead - Kettering chanced across a newspaper
article on selenium and Midgley discovered that selenium and tellurium had
antiknock effects greater than aniline. Iodine was the first antiknock
additive of petroleum.
http://www.runet.edu/~wkovarik/papers/kettering.html
Synthesis and Crystal Structures of Phenyltrimethylammonium Salts of
Hexachlorotellurate (IV), and catena-poly (Di--chlorobis
{tetrachlorotellurate (IV)} -- bromine, and Di--chlorobis
{tetrachlorotellurate (IV)}
catena-poly[(-Chlorobis{pentachlorotellurate(IV)})--iodine(I) by S. Hauge
and K. Maroy, Acta Chem. Scand. 50 (1996)
Tellurium http://www.fwkc.com/encyclopedia/low/articles/t/t025000495f.html
Tellurium ranks about 78th in natural abundance among the elements in the
earth's crust. It occurs in the pure state or is found in combination with
gold, silver, copper, lead, nickel in such minerals as sylvanite, petzite
and tetradymite. Tellurium reacts with excess chlorine to form tellurium
dichloride, and tellurium tetrachloride. It is oxidized by nitric acid to
produce tellurium dioxide, and by chromic acid to produce telluric acid. In
combination with hydrogen or certain metals, it forms tellurides huch as
hydrogen telluride and sodium telluride.
Tellurium is used in the manufacture of rectifiers and thermoelectric
devices, and in semiconductor research. With other organic substances, it
is employed as a vulcanizing agent (vulcanite is CuTe) in the processing of
natural and synthetic rubber, and in the antiknockj compounds for gasoline.
It is also used to impart a blue color to glass. Colloidal tellurium is an
insecticide, germicide and fungicide.
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