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An Apparatus for High-Precision Helium Diffusion Measurements from Minerals

Farley, Kenneth A. and Reiners, Peter W. and Nenow, Victor (1999) An Apparatus for High-Precision Helium Diffusion Measurements from Minerals. Analytical Chemistry, 71 (10). pp. 2059-2061. ISSN 0003-2700. doi:10.1021/ac9813078.

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We describe a simple and low-cost apparatus for in-vacuum helium diffusion measurements that reduces temperature gradients, set point overshoot, and ramping times compared with conventional resistance furnace techniques. The sample, suspended by a thin wire in a vacuum chamber, is heated by radiation from an Al-coated projector bulb passed through a sapphire viewport. Because the total mass of the sample package being heated is small (typically <100 mg), thermal gradients and thermal inertia are both small. In experiments with set points between 100 and 750 °C, this apparatus can achieve set point from room temperature in ∼90 s, usually with <3 °C of set point overshoot persisting for just a few seconds. Helium diffusion coefficient measurements indirectly indicate that temperatures are precise and reproducible to better than ±2 °C.

Item Type:Article
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URLURL TypeDescription
Farley, Kenneth A.0000-0002-7846-7546
Reiners, Peter W.0000-0001-7240-2373
Additional Information:We thank P. Zeitler and P. Copeland for thoughtful reviews and the David and Lucille Packard Foundation and the National Science Foundation for supporting this work.
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20220822-171697000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116371
Deposited By: Tony Diaz
Deposited On:30 Aug 2022 23:59
Last Modified:31 Aug 2022 16:57

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