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A new all-metal induction furnace for noble gas extraction

Zimmermann, Laurent and Avice, Guillaume and Blard, Pierre-Henri and Marty, Bernard and Füri, Evelyn and Burnard, Peter G. (2018) A new all-metal induction furnace for noble gas extraction. Chemical Geology, 480 . pp. 86-92. ISSN 0009-2541.

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A new all-metal induction furnace for extraction of all noble gases from pyroxenes, olivines, quartz or barites has been developed at CRPG. It differs in design from other induction furnaces in that the totality of the vacuum vessel is metallic and the induction coil, normally located outside the furnace, has been placed inside the vacuum vessel, with a special radio frequency power feedthrough welded onto a flange. The volume of the crucible is ≈ 15 cm^3 and permits fusion of samples with a mass of up to 1 g. Samples are packed into a metal foil, loaded into a carousel, baked out before analysis, and then sequentially dropped into the Ta-crucible. The low weight of the crucible (≈ 120 g) allows for short and efficient degassing cycles. When the furnace is pumped for the first time after samples loading, short cycles between 500 and 1800 °C at fast heating rates (≈ 400 °C·min^(−1)) are sufficient to achieve very low blanks. The durations of these cycles are range from 30 min for He to up to a few hours for Ne, Kr and Xe. Blanks of He, Kr and Xe (10 min heating durations) and Ne (20 min) in static vacuum are (1.6 ± 1.0) × 10^(−15) mol ^4He (T = 1750 °C), (5.8 ± 2.3) × 10^(−17) mol ^(20)Ne (T = 1500 °C), (2.1 ± 0.3) × 10^(−18) mol ^(84)Kr (T = 1700 °C) and (4.4 ± 0.4) × 10^(−18) mol ^(132)Xe (T = 1700 °C). Argon blanks have not yet been measured.

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Additional Information:© 2017 Elsevier B.V. Received 16 December 2016, Revised 11 September 2017, Accepted 12 September 2017, Available online 23 September 2017. This research was supported by funding from Observatoire Terre Environnement Lorraine (Otelo). We thank N. Stroncik and two anonymous reviewers for their constructive remarks, and F. Stuart for editorial handling. This is CRPG contribution number 2518.
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Observatoire Terre Environnement LorraineUNSPECIFIED
Subject Keywords:Noble gas extractions; All-metal induction furnace; Heating rate; Cooling rate; Low blank
Record Number:CaltechAUTHORS:20170925-082219699
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Official Citation:Laurent Zimmermann, Guillaume Avice, Pierre-Henri Blard, Bernard Marty, Evelyn Füri, Peter G. Burnard, A new all-metal induction furnace for noble gas extraction, Chemical Geology, Volume 480, 2018, Pages 86-92, ISSN 0009-2541,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81793
Deposited By: Tony Diaz
Deposited On:25 Sep 2017 17:39
Last Modified:23 Mar 2018 20:12

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