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Title: Preparation of low HD contamination cells for the measurement of the triple point temperature of n-D/sub 2/

Abstract

An effort is under way to produce deuterium triple point sealed cells for a 18.7 K temperature reference point. Stability with time of impurity content in cells, namely HD, was found to be good from measurements made at IMGC since 1978, but nearly all commercially produced ''chemical pure'' D/sub 2/ contains approximately 0.5% HD. To reduce the HD content in the D/sub 2/ cell, two steps have been taken: (1) The stainless steel cell was chemically etched and then vacuum baked to remove Fe from the surface and to diffuse protium out of the cell. (2) The cell was flushed and filled to 70 bar with D/sub 2/ directly obtained from a thermal diffusion column with HD <70 ppM. Triple point measurements with the cell show an initial drift due to para-ortho conversion of 0.4 mK per hour decreasing to 0.7 mK per hour after 130 hours of conversion. The initial triple point temperature on NBS-IPTS-68 was found to be 18.732 +- 0.001 K; this agrees with the value found in the earlier IMGC cells, filled with commercial D/sub 2/, when the latter are corrected for a 0.4 +- 0.1 HD content, but the conversion in this cell was 10more » times faster than in 304 stainless steel IMGC cells. Further measurements have been made using the clean n-D/sub 2/ in an unetched 304 stainless steel cell which has been flushed with D/sub 2/O vapor.« less

Authors:
; ;
Publication Date:
Research Org.:
Monsanto Research Corp., Miamisburg, OH (USA). Mound; Istituto di Metrologia G. Colonnetti, Turin (Italy)
OSTI Identifier:
5207866
Report Number(s):
MLM-3290(OP); CONF-850814-4
ON: DE85017426
DOE Contract Number:  
AC04-76DP00053
Resource Type:
Conference
Resource Relation:
Conference: Cryogenic engineering conference and international cryogenic materials conference, Boston, MA, USA, 12 Aug 1985; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONTAINMENT SYSTEMS; DESIGN; TEMPERATURE MEASUREMENT; CONTAMINATION; DEUTERIUM; MATHEMATICAL MODELS; STAINLESS STEEL-304; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CONTAINMENT; CORROSION RESISTANT ALLOYS; ENGINEERED SAFETY SYSTEMS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HYDROGEN ISOTOPES; IRON ALLOYS; IRON BASE ALLOYS; ISOTOPES; LIGHT NUCLEI; MATERIALS; NICKEL ALLOYS; NUCLEI; ODD-ODD NUCLEI; STABLE ISOTOPES; STAINLESS STEELS; STEELS; 420201* - Engineering- Cryogenic Equipment & Devices

Citation Formats

McConville, G T, Menke, D A, and Pavese, F. Preparation of low HD contamination cells for the measurement of the triple point temperature of n-D/sub 2/. United States: N. p., 1985. Web.
McConville, G T, Menke, D A, & Pavese, F. Preparation of low HD contamination cells for the measurement of the triple point temperature of n-D/sub 2/. United States.
McConville, G T, Menke, D A, and Pavese, F. 1985. "Preparation of low HD contamination cells for the measurement of the triple point temperature of n-D/sub 2/". United States.
@article{osti_5207866,
title = {Preparation of low HD contamination cells for the measurement of the triple point temperature of n-D/sub 2/},
author = {McConville, G T and Menke, D A and Pavese, F},
abstractNote = {An effort is under way to produce deuterium triple point sealed cells for a 18.7 K temperature reference point. Stability with time of impurity content in cells, namely HD, was found to be good from measurements made at IMGC since 1978, but nearly all commercially produced ''chemical pure'' D/sub 2/ contains approximately 0.5% HD. To reduce the HD content in the D/sub 2/ cell, two steps have been taken: (1) The stainless steel cell was chemically etched and then vacuum baked to remove Fe from the surface and to diffuse protium out of the cell. (2) The cell was flushed and filled to 70 bar with D/sub 2/ directly obtained from a thermal diffusion column with HD <70 ppM. Triple point measurements with the cell show an initial drift due to para-ortho conversion of 0.4 mK per hour decreasing to 0.7 mK per hour after 130 hours of conversion. The initial triple point temperature on NBS-IPTS-68 was found to be 18.732 +- 0.001 K; this agrees with the value found in the earlier IMGC cells, filled with commercial D/sub 2/, when the latter are corrected for a 0.4 +- 0.1 HD content, but the conversion in this cell was 10 times faster than in 304 stainless steel IMGC cells. Further measurements have been made using the clean n-D/sub 2/ in an unetched 304 stainless steel cell which has been flushed with D/sub 2/O vapor.},
doi = {},
url = {https://www.osti.gov/biblio/5207866}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}

Conference:
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