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Topic: Tellurium


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In the News (Mon 19 Aug 19)

  
  Tellurium - Wikipedia, the free encyclopedia
Tellurium is a relatively rare element, in the same chemical family as oxygen, sulfur, selenium, and polonium (the chalcogens).
Tellurium is sometimes found in its native form, but is more often found as the telluride of gold (calaverite), and combined with other metals.
Tellurium and tellurium compounds should be considered to be toxic and need to be handled with care.
en.wikipedia.org /wiki/Tellurium   (692 words)

  
 TELLURIUM - LoveToKnow Article on TELLURIUM   (Site not responding. Last check: 2007-11-07)
Tellurium was first recognized as a distinct element in 1798 by M. Klaproth.
It may be obtained by heating tellurium bismuth with sodium carbonate, lixiviating the fused mass with water, filtering, and exposing the filtrate to air, when the tellurium is gradually precipitated as a grey powder (J. Berzelius).
The precipitated tellurium is then fused with potassium cyanide, the melt extracted with water and the element precipitated by drawing a current of air through the solution and finally distilled in a current of hydrogen.
56.1911encyclopedia.org /T/TE/TELLURIUM.htm   (1106 words)

  
 VIAS Encyclopedia: Tellurium
Tellurium is a p-type semiconductor, and shows greater conductivity in certain directions, depending on alignment of the atoms.
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.
www.vias.org /encyclopedia/persys_te.html   (303 words)

  
 tellurium. The Columbia Encyclopedia, Sixth Edition. 2001-05
Tellurium is a lustrous, brittle, crystalline, silver-white metalloid.
Tellurium is occasionally found uncombined in nature but is more often found combined with metals, as in the minerals calaverite (gold telluride) and sylvanite (silver-gold telluride).
Tellurium is recovered as a byproduct of the electrolytic refining of blister copper.
www.bartleby.com /65/te/telluriu.html   (255 words)

  
 Tellurium
Tellurium is a non-metallic element recovered as a by-product of electrolytic copper refining.
Tellurium is used in the rubber industry as an accelerator and curing agent to improve high temperature properties and in the chemical industry as a catalyst.
Tellurium powder is available as minus 100 and minus 200 mesh (99% through the mesh) and minus 325 mesh (minimum 90% through 325 mesh), all shipped in 50-pound pails.
www.asarco.com /seltel_tellurium.html   (415 words)

  
 Tellurium (Te)   (Site not responding. Last check: 2007-11-07)
The principal commercial sources of tellurium are in the slime from lead and copper refineries and in the flue dust from telluride-gold deposits.
Tellurium is used in semiconductor research and also inthe manufacture of rectifiers and thermoelectric devices.
Tellurium is used in ceramics; and it is used to impart a blue color to glass.
www.bayerus.com /msms/fun/pages/periodic/tellurium   (193 words)

  
 C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - TELLURIUM
Elemental tellurium originally was put on the list of "extremely hazardous substances," but a review of the study by the Environmental Protection Agency indicated that sodium tellurate was used instead of tellurium.
Tellurium compounds in microgram amounts occur fairly widely in plants (for example, onions, peas, and tea leaves), and larger quantities (31–73 µg per g) are found in garlic buds.
My interest in tellurium came as the result of an attempt to prepare telluracyclobutene, a four-membered cyclic compound with one tellurium atom and a carbon-carbon double bond, to be used as an electron donor in semiconductor formation.
pubs.acs.org /cen/80th/tellurium.html   (769 words)

  
 Ferroalloys & Alloying Additives Online Handbook - Tellurium
Tellurium will not recycle through electric furnace or oxygen steelmaking processes, but will be retained to a considerable extent in the induction remelting of tellurium cast iron scrap.
In cast irons, tellurium is an extremely potent carbide stabilizer, to the extent that graphitization during the annealing of malleable irons is excessively retarded.
Tellurium is an optional constituent in standard free-machining grades but is routinely added to a number of proprietary steels.
www.shieldalloy.com /telluriumpage.html   (710 words)

  
 It's Elemental - The Element Tellurium
Tellurium is a semiconductor and is frequently doped with copper, tin, gold or silver.
Tellurium is also used to color glass and ceramics and is one of the primary ingredients in blasting caps.
Tellurium forms many compounds, but none that are commercially important.
education.jlab.org /itselemental/ele052.html   (230 words)

  
 Tellurium (UK PID)
Of toxicological interest are elemental tellurium, tellurium dioxide, the gases hydrogen telluride and tellurium hexafluoride, and the water soluble salts of tellurous and telluric acid.
EPIDEMIOLOGY Tellurium is used as an additive in many metallurgical processes such that it is often involved in multiple metal exposures, notably with lead, zinc, arsenic, selenium, cadmium and thallium.
Reprotoxicity There are no reports of exposure to tellurium or its compounds causing reproductive effects in humans although pregnant rats fed diets containing 500 to 3500 ppm tellurium gave birth to hydrocephalic (non- obstructive) offspring, the incidence of hydrocephalus being proportional to the tellurium dose (Duckett, 1970).
www.intox.org /databank/documents/chemical/tellur/ukpid84.htm   (3553 words)

  
 Wikinfo | Tellurium   (Site not responding. Last check: 2007-11-07)
Amorphous tellurium is found by precipitating it from a solution of tellurous or telluric acid.
Tellurium is also used in blasting caps, and has potential applications in cadmium telluride solar panels.
The principal source of tellurium is from anode muds produced during the electrolytic refining of blister copper.
www.wikinfo.org /wiki.php?title=Tellurium   (619 words)

  
 Tellurium hexafluoride (UK PID)
Hazard/risk classification NIF INTRODUCTION Tellurium hexafluoride is a hexavalent compound of tellurium.
Tellurium exposure is characterized by a distinctive garlic odour which is due to formation of the hepatic metabolite dimethyl telluride.
Clinical studies Three men exposed to tellurium fumes developed a strong garlic breath odour and were treated with 2.5 mg/kg dimercaprol intramuscularly every four hours for 24 hours, every six hours for a further 24 hours and then daily for six days.
www.intox.org /databank/documents/chemical/telhexaf/ukpid83.htm   (2274 words)

  
 Tellurium   (Site not responding. Last check: 2007-11-07)
Tellurium, Te, is a metallic main group element, found in Group VIb of the periodic table.
Tellurium is a component in some alloys of lead to increase its tensile strength.
Tellurium is used in the electroplating of silver to produce a dark finish.
www.ucc.ie /ucc/depts/chem/dolchem/html/elem/elem052.html   (85 words)

  
 Tellurium
Tellurium was first discovered in 1782 by the German scientist Franz Joseph Müller von Reichenstein; it was recognized as an element and given its name in 1798 by the German chemist
Tellurium melts at about 452° C (about 846° F), boils at about 1390° C (about 2534° F), and has a specific gravity of 6.25.
Colloidal tellurium is an insecticide, germicide, and fungicide.
www.prospector-utah.com /Tellurium.htm   (292 words)

  
 Tellurium
Tellurium was discovered by Mflller von Reichenstein in 1782; named by Klaproth who isolated it in 1798.
Amorphous tellurium is formed by precipitating tellurium from a sdlution of telluric or tellurous acid.
Tellurium is a p-type semi- conductor, and shows greater conductivity in certain direc- tions, depending on alignment of the atoms.
pte.8k.com /EL052.html   (396 words)

  
 Inhibition of Squalene Monooxygenase by Tellurium and Selenium Compounds
Tellurium is a relatively rare element, most often found in combination with ores such as copper and silver.
The enzyme that is inhibited by tellurium is squalene monooxygenase, the second enzyme in the downstream pathway for cholesterol biosynthesis.
Inhibition of Squalene Monooxygenase by Tellurium and Selenium
www.uky.edu /Pharmacy/ps/porter/Squalene_monooxygenase_inhibition.html   (1486 words)

  
 tellurium
Amorphous tellurium is formed by precipitating tellurium from a solution of telluric or telturous acid.
Forty two isotopes and isomers of tellurium are known, with atomic masses ranging from 106 to 138.
Natural tellurium consists of eight isotopes, two of which are radioactive with very long half-lives.
www.speclab.com /elements/tellurium.htm   (556 words)

  
 Michael Swanwick's Periodic Table of Science Fiction
The tellurium is comprised of brass or wooden balls representing the Sun, Earth, and Moon with associated gears, arms, and pulleys, and is used to demonstrate the mechanics of eclipses and of the seasons.
The single finest tellurium in existence was built by the New England machinist, astronomer, and misanthrope, Benjamin Dee, in 1816.
His tellurium underwent various adventures and now rests forgotten in a box stored in a library basement, not far from the furnace.
www.scifi.com /scifiction/elements/tellurium.html   (384 words)

  
 Mineral Information Institute - TELLURIUM   (Site not responding. Last check: 2007-11-07)
Tellurium is recovered from the residue produced in refining blister copper from deposits containing recoverable amounts of tellurium.
In addition, tellurium is present in coal and some lower-grade copper deposits, but the cost of recovering the tellurium from these deposits is too high to make it worth the effort.
Tellurium is also used in other electronic applications, and in the production of blasting caps for explosives.
www.mii.org /Minerals/phototellurium.html   (412 words)

  
 Minerals in Your World: Minerals and Materials - Tellurium   (Site not responding. Last check: 2007-11-07)
Tellurium is an element with a metallic luster and tin-white color.
Tellurium is a semiconductor, which means that it has electrical properties are between those of a metal and an insulator.
Tellurium's major use is in metallurgy to improve the properties of copper, iron, lead, steel, and tin; its other major uses are in chemicals and electronic devices.
resourcescommittee.house.gov /subcommittees/emr/usgsweb/materials/tellurium.html   (128 words)

  
 Inhibition of human squalene monooxygenase by tellurium compounds: evidence of interaction with vicinal sulfhydryls -- ...
As tellurium is methylated in the liver (9), the dimethyl
of squalene monooxygenase to tellurium inhibition in vivo, and
De Meio, R. H., Onischuk, R. Hemolysis by tellurium compounds: tellurite and tellurate, inhibitors of the hemolysis, effect of in vitro aging of the erythrocytes, and role of sulfhydryl compounds.
www.jlr.org /cgi/content/full/42/2/235   (3511 words)

  
 general remarks
A Tellurium (after the Latin tellus, the earth) is an apparatus to demonstrate the movements of the earth and the moon.
The Tellurium N with numerous patented novelties has been developed by Professor Dr. Jürgen Newig, Geographical Institute of Kiel University in cooperation with Cornelsen Experimauita.
It begins with the complete turn of the lever arm while focusing the seasons (take hold of the handle) and it also applies to the turn of the earth around itself, the earth's rotation, and finally to the turn of the moon around the earth.
www.tellurium.de /down/eng/genremarks.htm   (398 words)

  
 Tellurium: Occurrence   (Site not responding. Last check: 2007-11-07)
Tellurium is a not very abundant element, and can be found associated to the gold, copper or sulfur ores.
Tellurium can also be found in the native state and in the dioxide form (TeO2).
The main tellurium deposits are located in Canada, in the USA (Montana, Utah and Arizona) and in Peru.
nautilus.fis.uc.pt /st2.5/scenes-e/elem/e05220.html   (83 words)

  
 Tellurium, New Mexico
The writer has identified native tellurium as one of several minerals in vein material collected at a gold prospect located in Grant County, New Mexico, at a locality about 41 miles northwest of Silver City and 12 miles south-southeast of Mogollon.
The tellurium occurs in irregular ovoid bodies of various sizes, the maximum measured being 18 mm.
So far as the writer has been able to determine this occurrence of native tellurium is the first to be mentioned in the state.
www.minsocam.org /msa/collectors_corner/arc/tellurium.htm   (373 words)

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