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Title: Evidence for independent motional processes on the two interstitial sublattices of a layer-structured metal hydride: hydrogen spin-lattice relaxation and motional narrowing in zirconium monohalide hemihydrides, ZrXH/sub 0. 5/

Abstract

We report the results of a proton-magnetic-resonance investigation of hydrogen location and motion in the hemihydrides ZrXH/sub 0.5/ of the metallic layer-structured monohalides ZrX of zirconium (X = Br,Cl). Wide-line and pulsed NMR methods were employed to measure the temperature dependence of the linewidth and second moment and of the spin-lattice relaxation time in the laboratory and rotating frames. The results indicate that hydrogen forms an ordered structure on the tetrahedral (T) interstitial sublattice within the Zr metal bilayers, with some (small) random occupancy of octahedral (O) sites. Two stages of motional narrowing observed in the wide-line measurements and double minima found in the relaxation times are consistent with the occurrence of essentially independent hydrogen motional processes on the T and O interstitial sublattices. Hydrogen site occupancy probabilities, jump frequencies, activation energies for hydrogen diffusion, and conduction-electron contributions to the proton spin-lattice relaxation rate are deduced from the measurements.

Authors:
; ; ;
Publication Date:
Research Org.:
Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011
OSTI Identifier:
6267463
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 27:1
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HALIDES; NUCLEAR MAGNETIC RESONANCE; ZIRCONIUM HYDRIDES; SPIN-LATTICE RELAXATION; ACTIVATION ENERGY; EXPERIMENTAL DATA; LAYERS; LINE NARROWING; LINE WIDTHS; MOTION; PULSES; RELAXATION TIME; SELF-DIFFUSION; TEMPERATURE DEPENDENCE; DATA; DIFFUSION; ENERGY; HALOGEN COMPOUNDS; HYDRIDES; HYDROGEN COMPOUNDS; INFORMATION; MAGNETIC RESONANCE; NUMERICAL DATA; RELAXATION; RESONANCE; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Hwang, T Y, Schoenberger, R J, Torgeson, D R, and Barnes, R G. Evidence for independent motional processes on the two interstitial sublattices of a layer-structured metal hydride: hydrogen spin-lattice relaxation and motional narrowing in zirconium monohalide hemihydrides, ZrXH/sub 0. 5/. United States: N. p., 1983. Web. doi:10.1103/PhysRevB.27.27.
Hwang, T Y, Schoenberger, R J, Torgeson, D R, & Barnes, R G. Evidence for independent motional processes on the two interstitial sublattices of a layer-structured metal hydride: hydrogen spin-lattice relaxation and motional narrowing in zirconium monohalide hemihydrides, ZrXH/sub 0. 5/. United States. https://doi.org/10.1103/PhysRevB.27.27
Hwang, T Y, Schoenberger, R J, Torgeson, D R, and Barnes, R G. 1983. "Evidence for independent motional processes on the two interstitial sublattices of a layer-structured metal hydride: hydrogen spin-lattice relaxation and motional narrowing in zirconium monohalide hemihydrides, ZrXH/sub 0. 5/". United States. https://doi.org/10.1103/PhysRevB.27.27.
@article{osti_6267463,
title = {Evidence for independent motional processes on the two interstitial sublattices of a layer-structured metal hydride: hydrogen spin-lattice relaxation and motional narrowing in zirconium monohalide hemihydrides, ZrXH/sub 0. 5/},
author = {Hwang, T Y and Schoenberger, R J and Torgeson, D R and Barnes, R G},
abstractNote = {We report the results of a proton-magnetic-resonance investigation of hydrogen location and motion in the hemihydrides ZrXH/sub 0.5/ of the metallic layer-structured monohalides ZrX of zirconium (X = Br,Cl). Wide-line and pulsed NMR methods were employed to measure the temperature dependence of the linewidth and second moment and of the spin-lattice relaxation time in the laboratory and rotating frames. The results indicate that hydrogen forms an ordered structure on the tetrahedral (T) interstitial sublattice within the Zr metal bilayers, with some (small) random occupancy of octahedral (O) sites. Two stages of motional narrowing observed in the wide-line measurements and double minima found in the relaxation times are consistent with the occurrence of essentially independent hydrogen motional processes on the T and O interstitial sublattices. Hydrogen site occupancy probabilities, jump frequencies, activation energies for hydrogen diffusion, and conduction-electron contributions to the proton spin-lattice relaxation rate are deduced from the measurements.},
doi = {10.1103/PhysRevB.27.27},
url = {https://www.osti.gov/biblio/6267463}, journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 27:1,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}