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Title: Detecting low concentrations of plutonium hydride with magnetization measurements

Abstract

We report the formation of plutonium hydride in 2 at. % Ga-stabilized δ-Pu, with 1 at. % H charging. We show that magnetization measurements are a sensitive, quantitative measure of ferromagnetic plutonium hydride against the nonmagnetic background of plutonium. It was previously shown that at low hydrogen concentrations, hydrogen forms super-abundant vacancy complexes with plutonium, resulting in a bulk lattice contraction. Here, we use magnetization, X-ray, and neutron diffraction measurements to show that in addition to forming vacancy complexes, at least 30% of the H atoms bond with Pu to precipitate PuH{sub x} on the surface of the sample with x ∼ 1.9. We observe magnetic hysteresis loops below 40 K with magnetic remanence, consistent with ferromagnetic PuH{sub 1.9}.

Authors:
; ; ; ;  [1]; ; ; ;  [2]
  1. National High Magnetic Field Laboratory, MPA-CMMS, Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87545 (United States)
  2. Nuclear Material Science Group, MST-16, LANL, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
22413038
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; FERROMAGNETIC MATERIALS; FERROMAGNETISM; HYDROGEN; HYSTERESIS; MAGNETIZATION; NEUTRON DIFFRACTION; PLUTONIUM; PLUTONIUM HYDRIDES; PRECIPITATION; SURFACES; VACANCIES; X-RAY DIFFRACTION

Citation Formats

Kim, Jae Wook, Mun, E. D., Baiardo, J. P., Zapf, V. S., Mielke, C. H., Smith, A. I., Richmond, S., Mitchell, J., and Schwartz, D.. Detecting low concentrations of plutonium hydride with magnetization measurements. United States: N. p., 2015. Web. doi:10.1063/1.4907216.
Kim, Jae Wook, Mun, E. D., Baiardo, J. P., Zapf, V. S., Mielke, C. H., Smith, A. I., Richmond, S., Mitchell, J., & Schwartz, D.. Detecting low concentrations of plutonium hydride with magnetization measurements. United States. doi:10.1063/1.4907216.
Kim, Jae Wook, Mun, E. D., Baiardo, J. P., Zapf, V. S., Mielke, C. H., Smith, A. I., Richmond, S., Mitchell, J., and Schwartz, D.. Sat . "Detecting low concentrations of plutonium hydride with magnetization measurements". United States. doi:10.1063/1.4907216.
@article{osti_22413038,
title = {Detecting low concentrations of plutonium hydride with magnetization measurements},
author = {Kim, Jae Wook and Mun, E. D. and Baiardo, J. P. and Zapf, V. S. and Mielke, C. H. and Smith, A. I. and Richmond, S. and Mitchell, J. and Schwartz, D.},
abstractNote = {We report the formation of plutonium hydride in 2 at. % Ga-stabilized δ-Pu, with 1 at. % H charging. We show that magnetization measurements are a sensitive, quantitative measure of ferromagnetic plutonium hydride against the nonmagnetic background of plutonium. It was previously shown that at low hydrogen concentrations, hydrogen forms super-abundant vacancy complexes with plutonium, resulting in a bulk lattice contraction. Here, we use magnetization, X-ray, and neutron diffraction measurements to show that in addition to forming vacancy complexes, at least 30% of the H atoms bond with Pu to precipitate PuH{sub x} on the surface of the sample with x ∼ 1.9. We observe magnetic hysteresis loops below 40 K with magnetic remanence, consistent with ferromagnetic PuH{sub 1.9}.},
doi = {10.1063/1.4907216},
journal = {Journal of Applied Physics},
number = 5,
volume = 117,
place = {United States},
year = {Sat Feb 07 00:00:00 EST 2015},
month = {Sat Feb 07 00:00:00 EST 2015}
}