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Title: Using magnetization measurements to detect small amounts of plutonium hydride formation in plutonium metal

Abstract

We report the formation of plutonium hydride in 2 at % Ga-stabilized δ-Pu, with 1 atomic % 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 x, largely on the surface of the sample with x ~ 1.9. We observe magnetic hysteresis loops below 40 K with magnetic remanence, consistent with precipitates of ferromagnetic PuH 1.9.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Rutgers Univ., New Brunswick, NJ (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1160101
Report Number(s):
LA-UR-13-29611
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; PU-H2; PU MAGNETISM

Citation Formats

Kim, Jae Wook, Mielke, Charles H., Zapf, Vivien, Baiardo, Joseph P., Mitchell, Jeremy N., Richmond, Scott, Schwartz, Daniel S., Mun, Eun D., and Smith, Alice Iulia. Using magnetization measurements to detect small amounts of plutonium hydride formation in plutonium metal. United States: N. p., 2014. Web. doi:10.2172/1160101.
Kim, Jae Wook, Mielke, Charles H., Zapf, Vivien, Baiardo, Joseph P., Mitchell, Jeremy N., Richmond, Scott, Schwartz, Daniel S., Mun, Eun D., & Smith, Alice Iulia. Using magnetization measurements to detect small amounts of plutonium hydride formation in plutonium metal. United States. doi:10.2172/1160101.
Kim, Jae Wook, Mielke, Charles H., Zapf, Vivien, Baiardo, Joseph P., Mitchell, Jeremy N., Richmond, Scott, Schwartz, Daniel S., Mun, Eun D., and Smith, Alice Iulia. Mon . "Using magnetization measurements to detect small amounts of plutonium hydride formation in plutonium metal". United States. doi:10.2172/1160101. https://www.osti.gov/servlets/purl/1160101.
@article{osti_1160101,
title = {Using magnetization measurements to detect small amounts of plutonium hydride formation in plutonium metal},
author = {Kim, Jae Wook and Mielke, Charles H. and Zapf, Vivien and Baiardo, Joseph P. and Mitchell, Jeremy N. and Richmond, Scott and Schwartz, Daniel S. and Mun, Eun D. and Smith, Alice Iulia},
abstractNote = {We report the formation of plutonium hydride in 2 at % Ga-stabilized δ-Pu, with 1 atomic % 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 PuHx, largely on the surface of the sample with x ~ 1.9. We observe magnetic hysteresis loops below 40 K with magnetic remanence, consistent with precipitates of ferromagnetic PuH1.9.},
doi = {10.2172/1160101},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 20 00:00:00 EDT 2014},
month = {Mon Oct 20 00:00:00 EDT 2014}
}

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