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Topic: Tantalum

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Tantalium

Lanthanum

Niobium

Columbium

Tungsten

Periodic table (standard)

Rhenium

Periodic table

Tantalum carbide

Rhenium

Caesium

Molybdenum

Tungsten

Group 5 element

	Tantalum - LoveToKnow 1911
		In its chemical relationships tantalum is associated with vanadium, columbium and didymium in a sub-group of the periodic classification.
		Tantalum pentoxide, Ta205, is a white amorphous infusible powder, or it may be crystallized by strongly heating, or by fusing with boron trioxide or microcosmic salt.
		Tantalum pentachloride, TaC1 5, is obtained as light yellow needles by heating a mixture of the pentoxide and carbon in a current of chlorine.
	www.1911encyclopedia.org /Tantalum (860 words)

	Tantalum
		Tantalum is gray, heavy, ductile, very hard, easily fabricated, highly resistant to corrosion by acids, and is a good conductor of heat and electricity.
		Tantalum is also used to produce a variety of alloys that have high melting points, are strong and have good ductility.
		Tantalum containing compounds are rarely encountered, and the metal does not normally cause problems in the laboratory, but it should still be regarded as highly toxic.
	www.ebroadcast.com.au /lookup/encyclopedia/ta/Tantalium.html (605 words)

	Tantalum Products
		Tantalum works similar to copper in forming operations it can be cold-formed in both the grain direction and in the cross grain direction.
		Tantalum is used in vacuum furnaces where very high temperatures must be attained and where there can be no residual oxygen or hydrogen present during the cycle.
		Melting Point: 5425°F (2996°C) Of the refractory metals, tantalum is outranked only by tungsten at 6170°F and rhenium at 5732°F. The high temperature strength of tantalum, combined with its workability, has resulted in the fabrication of superior heat shields, heating elements, electrodes, and other high temperature parts.
	www.hcrosscompany.com /refractory/tantalum.htm (664 words)

	Tantalum - Wikipedia, the free encyclopedia
		Tantalum (IPA: /ˈtæntələm/), formerly tantalium (IPA: /ˌtænˈtæliəm/) is a chemical element in the periodic table that has the symbol Ta and atomic number 73.
		Tantalum ores are mined in Ethiopia, Australia, Brazil, Egypt, Canada, the Democratic Republic of the Congo, Mozambique, Nigeria, Portugal, Malaysia and Thailand.
		Tantalum has been proposed as a "salting" material for nuclear weapons (cobalt is another, better-known salting material).
	en.wikipedia.org /wiki/Tantalum (868 words)

	Tantalum (Site not responding. Last check: 2007-11-06)
		Tantalum is combined with cobalt, iron, and nickel in super-alloys for aerospace structures and jet engine parts.
		Tantalum is also combined with carbon as tantalum carbide and with other metals to use as metal-cutting tools, wear-resistant parts, and for boring tools.
		Tantalum and niobium are chemically similar and are often present in similar geologic environments.
	www.state.ar.us /agc/tantalum.htm (221 words)

	Tantalum (Site not responding. Last check: 2007-11-06)
		Tantalum is a shiny, grey, but ductile metal that resembles platinum.
		Tantalum is not readily attacked by chemicals and forms an oxide film on its surface.
		Tantalum occus in nature in the minerals columbite and tantalite (Col-tan) and euxenite.
	nobel.scas.bcit.ca /resource/ptable/ta.htm (313 words)

	tantalum - HighBeam Encyclopedia (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-11-06)
		TANTALUM [tantalum] [from Tantalus ], metallic chemical element; symbol Ta; at.
		Tantalum is almost always found in association with niobium; separation of the two metals is difficult.
		Tantalum was used in the filaments of electric light bulbs and electronic tubes but has been largely replaced by tungsten for these uses.
	www.encyclopedia.com.cob-web.org:8888 /doc/1E1-tantalum.html (384 words)

	Tantalum - Sources and Properties of Tantalum
		Tantalum itself is a heavy (specific gravity of 16.6) blue-grey metallic element with a melting point of 2,996°C. It has excellent corrosion resistance, good ductility and is resistant to most acids.
		The advantage of tantalum in capacitors is its high volumetric efficiency, which enables miniaturisation, high reliability and stability over a wide temperature range (-55°C to 125°C), attributes not matched by other types of capacitor material, such as ceramics.
		As well as tin, Paranapanema is producing tantalum and niobium (apogranites contain both elements in a ratio of approximately 1:10) and the company is reported to have signed a 80,000 lbs per year contract with a US processor.
	www.azom.com /details.asp?ArticleID=1715 (1725 words)

	Tantalum \| World of Chemistry
		Tantalum is a transition metal in Group 5 of the periodic table.
		The discovery of tantalum is inextricably interwoven with the discovery of a second element, niobium.
		Tantalum alloys are also used in laboratory equipment, weights for precise laboratory balances, fountain and ball point pen points, and a variety of medical and dental applications.
	www.bookrags.com /research/tantalum-woc (338 words)

	REMBAR Tantalum Technical Info
		Tantalum and its alloys are midway between tungsten and molybdenum in density and melting points.
		Tantalum, discovered by Ekeberg, a Swedish chemist in 1802, is a metal that is closely related to niobium.
		Tantalum is difficult to machine, however, and should be left to those experienced with it for machining operations.
	www.rembar.com /Tantalum.htm (2996 words)

	Tantalum chip capacitor - Patent 6380577
		The tantalum wire which extends from the tantalum pellet through the insulating material terminates substantially flush with the insulating material, allowing the termination materials to be applied over a substantially flat surface.
		The tantalum chip capacitors of the present invention are created by methods which include the step of grinding the anode end of the capacitor so that the tantalum wire is flush with the insulating material.
		The tantalum wire is cut or ground at the point of egress from the insulating material such that the exposed surface of the wire is substantially flush with the insulating material and is electrically connected to a first terminal which is substantially flat in the proximity of the wire.
	www.freepatentsonline.com /6380577.html (4524 words)

	Commerce Resources Corp. - About Tantalum - Sun Nov 5, 2006
		The sale of tantalum mineral concentrates is based on a certified analysis for the tantalum oxide they contain, with a range from 10 or 15 to over 60% depending on the mine source.
		The extraction and refining of tantalum, including the separation from niobium in these various tantalum-containing mineral concentrates, is generally accomplished by reacting the ores with a mixture of hydrofluoric and sulfuric acids at elevated temperatures.
		Tantalum metal powder is generally produced by the sodium reduction of the potassium tantalum fluoride in a molten salt system at high temperature.
	www.commerceresources.com /s/AboutTantalum.asp (1025 words)

	Tantalum (Site not responding. Last check: 2007-11-06)
		Worried about potential environmental impacts of a tantalum plant scheduled to be opened in August, 1986, an estimated 3,000 people in the coastal resort town of Phuket, Thailand, took matters into their own hands on June 23, 1986, and set the plant on fire.
		Tantalum, an element found in the minerals tantalite, columbite, struverite and in tin slag, is used as an alloy because of its heat resistance and malleability, for making machine cutting and drilling tools, in electronic capacitors, in nuclear reactors, and for making special lenses.
		In January 1982, Thailand Tantalum Industry Co., Ltd. (TTI) signed a $1,440,000 contract with a design firm for a plant that would be the first of its kind in Asia and the second largest tantalum producer in the world after one in West Germany.
	www.lehigh.edu /~kaf3/books/tantalum.html (2441 words)

	Tantalum (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-11-06)
		Tantalum is a metal that is always found with Niobium.
		When it is tantalum pentoxide (a compound) it is used in capacitors, condesers, cutting tools like knifes, and in metal alloys.
		Tantalum is also very important in making repairs to the human body.
	www.mvschools.org.cob-web.org:8888 /ms/projects/html/blue/tantalum.htm (422 words)

	It's Elemental - The Element Tantalum
		Tantalum was discovered by Anders Gustaf Ekenberg, a Swedish chemist, in 1802 in minerals obtained from Ytterby, Sweden.
		Tantalum is a strong, ductile metal that is nearly immune to chemical attack at room temperatures.
		Tantalum also does not irritate the body and is used to make surgical sutures as well as implants, such as artificial joints and cranial plates.
	education.jlab.org /itselemental/ele073.html (283 words)

	Method for electroplating of tantalum - Patent 6936155
		Tantalum is used in a wide range of fields such as electrolytic capacitors, materials of electronic products and materials of chemical devices, by taking advantage of its properties such as a high melting point, a sufficient ductility and malleability and an excellent corrosion resistance.
		Thus, it is proved that the reduction for finally forming the zero-valent tantalum or providing an electrolytically formed tantalum film is caused at the stages corresponding to the waves C and D which are caused newly by adding the lithium fluoride.
		As to two components of the tantalum pentachloride and the alkylimidazolium chloride, the mole ratio of the tantalum pentachloride to the two components is preferable from 30 mol % to 50 mol %, and the mole ratio of the alkylimidazolium chloride to the two components is preferably from 50 mol % to 70 mol %.
	www.freepatentsonline.com /6936155.html (2445 words)

	Tantalum Consumption
		Tantalum powder is the largest sector representing approximately 60-65% of total tantalum consumption, with current annual consumption of 2.2 — 3.0 million lbs Ta per annum.
		Tantalum powder is used in the manufacture of tantalum capacitors.
		In addition, tantalum wire is utilized in the fabrication of tantalum anodes for capacitors; plus tantalum trays and heat shields used in furnaces for anode sintering.
	www.atwall.com /atwall/tantalumcons.html (341 words)

	Tantalum (Ta) - Chemical properties, Health and Environmental effects
		Tantalum is a shiny, silvery metal which is soft when is pure.
		Tantalum finds use in four areas: high-temperature applications, such as aircraft engines; electrical devices, such as capacitors; sirurgical impants and handling corrosive chemicals.
		Tantalum resist corrosion and is almost impervious to chemical attack, for this reason it has been employed in chemical industry, e.g.
	www.lenntech.com /Periodic-chart-elements/Ta-en.htm (349 words)

	Tantalum (Site not responding. Last check: 2007-11-06)
		Tantalum is almost completely immune to chemical attack at temperatures below 150 °C, and is attacked only by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulfur trioxide.
		Tantalum is used to make a variety of alloys with desirable properties such as high melting point, high strength, good ductility, etc. Scientists at Los Alamos have produced a tantalum carbide graphite composite material, which is said to be one of the hardest materials ever made.
		Tantalum is used to make electrolytic capacitors and vacuum furnace parts, which account for about 60% of its use.
	www.sunysccc.edu /academic/mst/ptable/Ta.html (435 words)

	Tantalum - An Overview
		Tantalum is a rare, grey-blue metal found in approximately 15% of the world’s pegmatites.
		Tantalum’s major application in the electronics industry is in the manufacture of capacitors, devices that regulate the flow of electricity within an integrated circuit.
		Another fast growing application for tantalum is as an alloy in the manufacture of turbine blades for power stations and jet engines - tantalum improves structural integrity of the blades at high temperatures enabling the turbines to operate at higher temperatures, thereby increasing their fuel efficiency.
	www.azom.com /details.asp?ArticleID=1207 (434 words)

	Tantalum Balls or Beads
		Tantalum is very soft, and it is highly ductile.
		Numerous attempts at producing tantalum balls by our would be competitors have ended up with a layer of foreign particulate that is embedded in the outer surface.
		We have made tantalum balls or tantalum beads for medical applications from 0.014” (0.36mm) to 2mm (0.080 inches), but there are no real size limitations except the availability of the raw material.
	www.tantalumbeads.com (566 words)

	Cesium, Tantalum and Spodumene \| Commodity Summaries \| Industrial Minerals \| Business Development \| Mineral Resources ...
		Tantalum Mining Corporation of Canada Limited is part of the Cabot Corporation - a global specialty chemicals company.
		The Tanco mine is the a producer of Cesium, Tantalum and Spodumene.
		Tantalum is mined as tantalite ore in a shallow underground mine from a zoned pegmatite.
	www.gov.mb.ca /iedm/mrd/busdev/industrial/tantalum.html (654 words)

	Tantalum - Raw Materials and Processing
		Tantalum ores are found primarily in Australia, Canada, Brazil, and central Africa, with some additional quantities originating in southeast Asia and in China.
		The extraction and refining of tantalum, including the separation from niobium in these various tantalum-containing mineral concentrates, is generally accomplished by treating the ores with a mixture of hydrofluoric and sulfuric acids at elevated temperatures.
		Tantalum capacitors for electronic circuits in medical appliances such as hearing aids, pacemakers, also in airbag protection systems, ignition and motor control modules, GPS, ABS systems in automobiles, laptop computers, cellular phones, Playstation, video cameras, digital still cameras.
	www.tanb.org /tantalum1.html (1122 words)

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