On the volatility of protactinium in chlorinating and brominating gas media-Reference-Cited by-同舟云学术

On the volatility of protactinium in chlorinating and brominating gas media

Published:2022-04-21 Issue:6-9 Volume:110 Page:495-504
ISSN:0033-8230
Container-title:Radiochimica Acta
language:en
Short-container-title:

Author:

Gäggeler Heinz W.¹²,Eichler Bernd¹,Jost Dieter T.¹,Eichler Robert¹

Affiliation:

1. Labor für Radiochemie, Paul Scherrer Institut , 5232 Villigen , Switzerland

2. Departement für Chemie und Biochemie , Universität Bern , 3012 Bern , Switzerland

Abstract

Abstract A multi-target recoil chamber technique was applied to study online chemical properties of protactinium in chlorinating and brominating gas media using 226Pa (T 1/2 = 1.8 min) decaying by alpha emission (74%) and β+/EC decay (26%). A 58 MeV proton beam passing 15 × 50 μg/cm2 thick 232Th targets enabled production of 226Pa formed in the reaction 232Th(p,7n). Isothermal gas chromatography in quartz columns allowed for the determination of adsorption enthalpies of oxohalides and pure halides of Pa5+ compounds. On the basis of empirical correlations, these adsorption enthalpies (ΔH0 ads) could be converted to sublimation enthalpies (ΔH0 subl). Resulting values for the assumed compounds PaCl5, PaOCl3, PaBr5, and PaOBr3 were 113 ± 15, 329 ± 16, 165 ± 5 and 235 ± 17 kJ/mol, respectively. These values are rather similar to known ΔH0 subl data for group-5 elements Nb, Ta and Db in support of the assumption that Pa is a pseudo-group 5 element.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry

Link

https://www.degruyter.com/document/doi/10.1515/ract-2021-1128/pdf

Reference58 articles.

1. Hahn, O., Meitner, L. Die Muttersubstanz des Actiniums, ein neues radioaktives Element von langer Lebensdauer. Phys. Z. 1918, 19, 208–212.

2. Soddy, F., Cranston, J. A. The parent of actinium. Proc. R. Soc. A 1918, 94, 384–404.

3. Grosse, A. V. Die Konzentrierung und Isolierung des Elements 91 — Protactinium. Naturwissenschaften 1927, 15, 766–767; https://doi.org/10.1007/bf01504977.

4. Oak Ridge, Natl. Lab. Proc. Protactinium Chem. Symp., Gatlinburg, Tenn., 25–26 April 1963. US Report TID, Oak Ridge Natl. Lab: Oak Ridge, 1964.

5. Boussières, G., Muxart, R., Eds. Physico-Chimie du Protactinium. Centre National de la Recherche Scientifique Orsay: Paris, 1966; July 2–8, 1965.