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Title: Chemistry/Elements/Tellurium - LANL: Tellurium Sources, properties, handling, and uses.
Lenntech__Tellurium Physical data, chemical properties, health and environmental effects.

Tellurium Data tables and historic information.

Visual_Elements__Tellurium General and physical information, source, uses, key isotopes, and ionisation energies.

WebElements__Tellurium Extensive information on history, uses, occurrence, compounds, and properties.

Wikipedia__Tellurium Properties of the element, including its history, applications, and characteristics.

Radiochemistry_of_Tellurium Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (July, 1961)

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Tellurium /* No Right Click Copyright Mike McGrath (http://website.lineone.net/~mike_mcgrath/) To add more shock to your site, visit www.DHTML Shock.com */ Back to the Periodic Table         Tellurium Atomic Number: 52 Atomic Radius: 143.2 pm Atomic Symbol: Te Melting Point: 449.5 șC Atomic Weight: 127.60 Boiling Point: 988 șC Electron Configuration: [Kr]5s24d105p4 Oxidation State:  6, 4, -2

History

(L. tellus: earth) Discovered by Muller von Reichenstein in 1782; named by Klaproth, who isolated it in 1798.

Sources

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 anode muds produced during the electrolytic refining of blister copper. The U.S., Canada, Peru, and Japan are the largest Free World producers of the element.

Properties

Crystalline tellurium has a silvery-white appearance, and when pure it 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.

Handling

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.

Isotopes

Thirty isotopes of tellurium are known, with atomic masses ranging from 108 to 137. Natural tellurium consists of eight isotopes.

Uses

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 thermoelectric devices.

Costs

Tellurium costs about $100/lb, with a purity of about 99.5%. Title Picture: tellurium crystals Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. Chemistry Division HomeLANL Home Last Updated: 12/15/2003,© Chemistry Operations Operated by the University of California for the US Department of Energy   | Help | Copyright © UC 2003 | Disclaimer  
 

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