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NMR study of the plutonium hydride system

Journal Article · · Phys. Rev., B; (United States)
; ;
An NMR study was conducted on protons in the nonstoichiometric plutonium hydride system. PuH/subx/. The following compositions were studied: x = 1.78, 2.35, 2.65, and 2.78. The line shapes, Knight shifts (K), spin-spin relaxation times (T/sub 2/), and spin-lattice relaxation times (T/sub 1/) were measured in the temperature range of 77--300 K. The results indicate the existence of paramagnetic phases at high temperatures. The predicted transition temperatures and type of magnetic order were found to depend strongly on the hydrogen concentration. Different line shapes and shifts are found for the tetrahedral and octahedral protons, which indicate a different bound state for the hydrogen ions. The hydrogen self-diffusion constants were derived from T/sub 2/ measurements in the motionally regime, and were found to be quite similar to those found in the LaH/subx/ system. T/sub 1/T as well as (K-K/sub 0/)/sup -1/ were found to be linear with temperature. The proportionality constants were found to be composition independent. The possible magnetic couplings between the protons and the paramagnetic moments are discussed. (AIP)
Research Organization:
Argonne National Laboratory, Argonne, Lllinois 60439
OSTI ID:
7343477
Journal Information:
Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 14:3; ISSN PLRBA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
BARYONS
DIFFUSION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDRIDES
HYDROGEN COMPOUNDS
KNIGHT SHIFT
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MAGNETISM
NUCLEAR MAGNETIC RESONANCE
NUCLEONS
PARAMAGNETISM
PLUTONIUM COMPOUNDS
PLUTONIUM HYDRIDES
PROTONS
RELAXATION
RESONANCE
SELF-DIFFUSION
SPIN-LATTICE RELAXATION
SPIN-SPIN RELAXATION
TRANSURANIUM COMPOUNDS