tantalum

Definitions

  • WordNet 3.6
    • n tantalum a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
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Webster's Revised Unabridged Dictionary
    • n Tantalum (Chem) A rare nonmetallic element found in certain minerals, as tantalite, samarskite, and fergusonite, and isolated as a dark powder which becomes steel-gray by burnishing. Symbol Ta. Atomic weight 182.0. Formerly called also tantalium.
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Century Dictionary and Cyclopedia
    • n tantalum Knowledge of this metal has been much increased by recent research. Brought to the elementary state by heating together sodium and an alkaline tantalofluoride and fused in an electric furnace, it appears as a solid of grayish-white color and metallic luster, like platinum, of specific gravity 16.64. It combines in a most remarkable way intense hardness with a high degree of ductility, so that it can be drawn into wire.05 millimeters in diameter having a resisting tensile stress ranging up to 93 kilos., or for fine wire 150 or 160 kilos., per square millimeter before breaking. It melts at 2,250–2,300° C., resists all the ordinary acids and alkaline solutions, is attacked by hydrofluoric acid and by fused caustic alkalis, and as thin wire bums, when heated in oxygen, with a bright white light.
    • n tantalum Chemical symbol, Ta; atomic weight, 192. One of the rare metals occurring in various combinations, but hardly known at all in the separate metallic state. As prepared by Berzelius, but not entirely pure, it appeared as a black powder, which assumed a grayish metallic luster under the burnisher, and which when gently heated took fire, and burned to an oxid. It was discovered by Ekeberg, in 1802, in the mineral afterward named by him yttrotantalite, and it has since been found in various rare minerals, as tantalite, columbite, pyrochlore, fergusonite, etc., in which it is almost always associated with niobium. It also occurs in small quantities in various tin, tungsten, and uranium ores. In its chemical relations it is allied to bismuth, antimony, and niobium.
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Chambers's Twentieth Century Dictionary
    • n Tantalum tan′tal-um a very rare metal of no practical importance, discovered in 1801, closely allied to columbium or niobium.
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Etymology

Webster's Revised Unabridged Dictionary
NL. So named on account of the perplexity and difficulty encounterd by its discoverer (Ekeberg) in isolating it. See Tantalus

Usage

In literature:

Later (1905) came the metalized carbon filament and finally the employment of tantalum or tungsten.
"The Age of Invention" by Holland Thompson
The first metallic filament used in the electric light on a commercial scale was made of tantalum, the metal of Tantalus.
"Creative Chemistry" by Edwin E. Slosson
In 1803 a new element was discovered and named tantalum.
"Artificial Light" by M. Luckiesh
Lonnie didn't care what electronic witchery took place in the minute spatial interstices between the finely-woven mesh of flexible tantalum.
"Zero Data" by Charles Saphro
Chemically related to vanadium are the two elements tantalum and columbium or niobium.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
Line 86 was the element tantalum.
"The Caves of Fear" by John Blaine
C. or upwards, and of these tantalum is one.
"Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6" by Various
Tantalum discovered by Ekeberg.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn
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In news:

The SpiTanIII software allows a user to select a tantalum or niobium oxide capacitor by various parameters, including capacitance , case size, or voltage rating.
Molybdenum and Tantalum have unique properties that make the refractory metals very attractive for use in today's advanced process technologies.
Starck Receives Second EICC Certificate for "Conflict-Free" Tantalum .
Starck recently announced its tantalum supply chain has been declared free of "conflict minerals" for a second consecutive year following an independent audit.
Announced that its current tantalum powder and wire suppliers were in compliance with the Conflict-Free Smelter Program (CFS).
Increased voltage capability of tantalum polymer capacitors opens up new applications.
Tantalum Capacitors Comply with Conflict-Free Smelter Program.
AVX Brings Conflict-Free Tantalum from Congo for Capacitors Jul 7, 2011 Printable format Email this Article Search.
Molybdenum and Tantalum have unique properties that make the refractory metals very attractive for use in today's advanced process technologies.
Impacts on Supply Chains Using Gold, Tin, Tantalum and Tungsten .
Tantalum Polymer Capacitors Achieve 125V Rating.
The tantalum capacitors with conductive polymers are more stable with ambient temperature and applied voltage when compared to multilayer ceramic capacitors (MLCCs).
Polymer tantalum capacitors offer several additional intrinsic benefits, such as withstanding high ripple currents and providing low ESR values.
Rare earth metals such as cerium and tantalum are needed to make everything from iPods and hybrid car batteries to wind turbines.
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In science:

The pions were produced by proton beams in a momentum range from 3 GeV/c to 12 GeV/c hitting a tantalum target with a thickness of 5% λI .
Results from HARP and their implications for neutrino physics
Figure 3 shows the same comparison for tantalum nuclei.
Fig. 3: Comparison of our cross-sections (black circles) of π± production by +8.0 GeV/c protons, +8.0 GeV/c π+ , and −8.0 GeV/c π− , off tantalum nuclei, with the cross-sections published by the HARP Collaboration (open circles).
For this study we have used the cross sections measured by HARP for tantalum.
Towards the optimal energy of the proton driver for a neutrino factory and muon collider
For each of the beam energies for which HARP has presented results, we have run MARS15 simulations, using both the default MARS generator and the LAQGSM generator, for all hadron-nucleus interactions in tantalum target of length 0:05I and 2I , and diameter ¼ 1 cm.
Towards the optimal energy of the proton driver for a neutrino factory and muon collider
Beam power normalized yield of captured muons YP calculated by MARS15 for thin and thick tantalum targets, and, in the last column, the ‘‘amplification factor’’ due to showering in the target, relative to the simple pion production cross section, normalized to the value at 4.1 GeV.
Towards the optimal energy of the proton driver for a neutrino factory and muon collider
Recently reported results of the high strain rates, high temperature measurements of the yield stress of tungsten and tantalum have been analyzed.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
The highest temperature reached in the experiment, based on heating and stressing a thin wire by a fast, high current pulse, was 2250 0C and 2450 0C, for tantalum and tungsten, respectively.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
Tungsten, tantalum and their alloys are the prefered candidates for many high strain rate applications, for example kinetic energy penetrators [1, 2].
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
As part of the UK programme of high power target developments for a Neutrino Factory a new dynamic method for thermomechanical characterization of the candidate materials (tungsten and tantalum in this case) has been developed [4, 5].
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
This paper is a continuation of the study presented in where the yield strength of tungsten and tantalum has been measured at strain rates from 500 to 1500 s−1 and at temperatures much higher than previously recorded in the literature.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
It should be noted that reference has a different aim and scope and that this paper is focused on the analysis of the new yield strength data, constitutive modelling and comparison with previous results for tungsten and tantalum at elevated temperatures.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
To determine the yield strength of the tantalum and tungsten wires the pulse amplitude of the current in the wire was increased in steps at a fixed temperature.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
Figure 2 shows the stress at which the tantalum and tungsten wires reached the yield point as a function of temperature.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
As the stress is inversely proportional to the square of the diameter, the band for the 0.5 mm diameter tantalum wire in Figure 2 is much wider than for the 0.8 mm diameter wire.
Experimental results and constitutive modelling for tungsten and tantalum at high strain rates and very high temperatures
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