Research Results For 'Tantalum'

JONS JAKOB BERZELIUS

Baron Jons Jakob Berzelius (John James Berzelius) was a Swedish chemist. He was born in 1779 and died in 1848. He studied medicine at Upsala, and after holding one or two medical appointments was appointed lecturer in chemistry in the Stockholm military academy in 1806, and the following year professor of pharmacy and medicine. In 1808 he became a member of the Academy of Sciences at Stockholm, in 1810 director, and in 1818 its perpetual secretary. In 1818 the king made him a noble, and in 1835 a baron. He was also a deputy to the National Assembly.

He discovered selenium and thorium, first exhibited calcium, barium, strontium, tantalum, silicium, and zirconium in the elemental state, and investigated whole classes of compounds, as those of fluoric acid, the metals in the ores of platinum, tantalum, molybdenum, vanadium, sulphur salts, etc, and introduced a new nomenclature and classification of chemical compounds. In short, there was no branch of chemistry to which he did not render essential service. His writings comprise an important Text-book of Chemistry, View of the Composition of Animal Fluids, New System of Mineralogy, Essay on the Theory of Chemical Proportions, etc. He was the founder of electrochemical theory and designed the system of chemical symbols still in use.
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TANTALUM

Tantalum is a rare silvery-looking metal element with the symbol Ta. It is found chiefly in tantalite and obtained by reducing to potassium flouro-tantalate by means of sodium followed by fusion in vacuo. Tantalum is used as a wire in electric lamps. Tantalum was discovered by A G Ekeberg in 1802, but the metal was not isolated until 1905. Combined with carbon, tantalum becomes almost as hard as diamond, and has been used to increase the hardness and tensile strength of steel. Tantalum is unaffected by most acids.
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COLUMBITE

Columbite is a mineral of a black colour, sub-metallic lustre, and high specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron, was first found in New England and is the main ore of niobium and tantalum. It shows a bluish iridescent fracture surface and is used in metallurgy to create heat-resistant alloys and in the rust proofing of stainless steel. It has the formulae (Fe,Mn)(Nb, Ta)2O6 and a relative hardness of 6.
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TANTALITE

Tantalite is a heavy mineral of an iron-black colour and sub-metallic lustre. It is essentially a tantalate of iron. Tantalite is formed in igneous rocks, especially granite pegmatite, and in placer deposits. It is associated with amblygonite, apatite, beryl, cassiterite, feldspar, quartz, spodumene and tourmaline. Tantalite is the main ore of tantalum.
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TA

TA is an abbreviation for Teaching Assistant
TA is an abbreviation for Terrain Avoidance
TA is an abbreviation for Type Approved
TA is an abbreviation for Telegraphic Address
TA is an abbreviation for Territorial Army
TA is an abbreviation for Typographical Association
TA is an abbreviation for Tithe Annuity
TA is an abbreviation for Transactional Analysis
Ta is an abbreviation for Tantalum
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