Thermodynamic Properties of Tantalum

Arblaster, John W.

doi:10.1007/s11669-018-0627-2

Cited by 22 publications

(19 citation statements)

References 68 publications

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“…The scanning speed is 20 cm s −1 , first rastering a rectangular area of 4 by 10 mm with a defocussed beam (∼ 0.5 mm diameter) for 3 min, then with focussed beam a circular area with 5 mm diameter, on the then shrivelled tube, for 2 min. The temperature achieved is sufficient to melt the top of the tantalum tube (melting point of tantalum is 3020 ± 15 • C; Arblaster, 2018) and to quantitatively sublimate the silica content of zircon. Zircon melts incongruently above ∼ 1690 • C (Kaiser et al, 2008), and the silica is presumably lost as silicon monoxide and oxygen (Fig.…”

Section: Krypton Extraction From Zirconmentioning

confidence: 99%

In situ-produced cosmogenic krypton in zircon and its potential for Earth surface applications

2022

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Abstract. Analysis of cosmogenic nuclides produced in surface rocks and sediments is a valuable tool for assessing the rates of processes and the timing of events that shaped the Earth surface. The various nuclides that are used have specific advantages and limitations that depend on the time range over which they are useful, the type of material they are produced in and not least the feasibility of the analytical effort. Anticipating novel applications in Earth surface sciences, we develop in situ-produced terrestrial cosmogenic krypton (Krit) as a new tool, the motivation being the availability of six stable and one radioactive isotope (81Kr, half-life 229 kyr) and of an extremely weathering-resistant target mineral (zircon). We provide proof of principle that terrestrial Krit can be quantified and used to unravel Earth surface processes.

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Section: Krypton Extraction From Zirconmentioning

confidence: 99%

In situ-produced cosmogenic krypton in zircon and its potential for Earth surface applications

2022

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“…The scanning speed is 20 cm/s; first rastering a rectangular area of 4 by 10 mm with a defocussed beam (~ 0.5 mm diameter) for three minutes, then with focussed beam a circular area with 5 mm diameter, on the then shrivelled tube, for two minutes. The temperature achieved is sufficient to melt the top of the Tantalum tube (melting point of Tantalum is 3020 ± 15 °C; (Arblaster, 2018)) and to quantitatively sublimate the silica content of zircon. Zircon melts https://doi.org/10.5194/gchron-2021-24 Preprint.…”

Section: Krypton Extraction From Zirconmentioning

confidence: 99%

“…5; Hoch et al, 1954). (Schick, 1960;Hoch et al, 1954;Arblaster, 2018;Kaiser et al, 2008), and the melting points of zircon (ZrSiO4), cristobalite (SiO2) and zirconia (Kaiser et al, 2008). Zircon melts incongruently to ZrO2 and SiO2-melt (the melting temperature of the high-temperature modification of SiO2, cristobalite, is only ~10K higher than that of zircon) (Kaiser et al, 2008).…”

Section: Krypton Extraction From Zirconmentioning

confidence: 99%

In situ produced cosmogenic krypton in zircon and its potential for Earth surface applications

Dunai

Binnie

Gerdes

2021

Preprint

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Abstract. Analysis of cosmogenic nuclides produced in surface rocks and sediments is a valuable tool for assessing rates of processes and the timing of events that shaped the Earth surface. The various nuclides that are used have specific advantages and limitations that depend on the time-range over which they are useful, the type of material they are produced in, and not least the feasibility of the analytical effort. Anticipating novel applications in Earth surface sciences, we develop in-situ produced terrestrial cosmogenic krypton (Krit) as a new tool; the motivation being the availability of six stable and one radioactive isotope (81Kr, half-life 229 kyr) and of an extremely weathering-resistant target mineral (zircon). We provide proof of principle that terrestrial Krit can be quantified and used to unravel Earth surface processes.

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“…dependent [21] Specific Heat C p , J/(kg K) temp. dependent [17] temp. dependent [22] Viscosity l, mPa s 8.0 [18] 4.8 [20] Surface Tension c, N/m 2.14 [18] 1.52 [23] Electrical Resistivity q el , 10 À8 X m 130 [19] 170 [22] At this new dynamic equilibrium with higher current, the magnetic field at the surface of the conical tip will be the same-increased induction will be compensated by increased distance to the coil.…”

Section: A ø40 MM Tantalum Electrodementioning

confidence: 99%

Numerical Modeling and Optimization of Electrode Induction Melting for Inert Gas Atomization (EIGA)

Spitans

Franz

Baake

2020

Metall Mater Trans B

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(EIGA) is the state-of-the-art process for the high-quality spherical powder production for additive manufacturing needs. The growing demand for EIGA powders drives the interest for the scale-up of well-established atomization of small Ø50 mm Ti-6Al-4V electrodes, as well as atomization of new refractory materials like Tantalum. However, during first tests with Ø150 mm Ti-6Al-4V and Ø50 mm Tantalum electrodes, the difficulties with melting stability were observed. In order to overcome these difficulties and to improve understanding of details of inductive coupling and favorable melting conditions, a numerical model for the electrode induction melting has been developed and applied.

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Thermodynamic Properties of Tantalum

Cited by 22 publications

References 68 publications

In situ-produced cosmogenic krypton in zircon and its potential for Earth surface applications

In situ-produced cosmogenic krypton in zircon and its potential for Earth surface applications

In situ produced cosmogenic krypton in zircon and its potential for Earth surface applications

Numerical Modeling and Optimization of Electrode Induction Melting for Inert Gas Atomization (EIGA)

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