Chemical and Intrinsic Hydrogen Diffusion in Pd0.75Ag 0.25-H Alloys

NMR Aspects

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In-situ hydrogen charging (discharging) process was realized in Pd 0.75Ag0.25-H alloys and simultaneous hydrogen concentration and nuclear spin-spin relaxation time measurements were done. Concentration-gradient driven diffusion coefficient was estimated from the hydrogen concentration-charging (discharging) time curve and data for the intrinsic diffusivity were deduced from the spin-spin relaxation time. Two-component spin-spin relaxation was found in the whole hydrogen concentration range, and at high H concentration, one of those is attributed to the hydrogen atoms embedded in the α the other one in the β phase. The diffusional motion is localized up to 105 - 106 intrinsic steps and there is no hydrogen atom exchange between the α and β phases on the time scale of spin-spin relaxation.

Original languageEnglish
Pages (from-to)93-106
Number of pages14
JournalDefect and Diffusion Forum
Volume224-225
Publication statusPublished - 2004

Fingerprint

Hydrogen
Nuclear magnetic resonance
nuclear magnetic resonance
hydrogen
Relaxation time
charging
hydrogen atoms
Atoms
relaxation time
Time measurement
Ion exchange
nuclear spin
diffusivity
diffusion coefficient
time measurement
gradients
curves

Keywords

  • Chemical Diffusion
  • Hydrogen Diffusion
  • Hydrogenated Alloys
  • Intrinsic Diffusion
  • Nuclear Magnetic Resonance
  • PdAg

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

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title = "Chemical and Intrinsic Hydrogen Diffusion in Pd0.75Ag 0.25-H Alloys: NMR Aspects",
abstract = "In-situ hydrogen charging (discharging) process was realized in Pd 0.75Ag0.25-H alloys and simultaneous hydrogen concentration and nuclear spin-spin relaxation time measurements were done. Concentration-gradient driven diffusion coefficient was estimated from the hydrogen concentration-charging (discharging) time curve and data for the intrinsic diffusivity were deduced from the spin-spin relaxation time. Two-component spin-spin relaxation was found in the whole hydrogen concentration range, and at high H concentration, one of those is attributed to the hydrogen atoms embedded in the α the other one in the β phase. The diffusional motion is localized up to 105 - 106 intrinsic steps and there is no hydrogen atom exchange between the α and β phases on the time scale of spin-spin relaxation.",
keywords = "Chemical Diffusion, Hydrogen Diffusion, Hydrogenated Alloys, Intrinsic Diffusion, Nuclear Magnetic Resonance, PdAg",
author = "K. Tompa and P. B{\'a}nki and M. Bokor",
year = "2004",
language = "English",
volume = "224-225",
pages = "93--106",
journal = "Defect and Diffusion Forum",
issn = "1012-0386",
publisher = "Trans Tech Publications",

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TY - JOUR

T1 - Chemical and Intrinsic Hydrogen Diffusion in Pd0.75Ag 0.25-H Alloys

T2 - NMR Aspects

AU - Tompa, K.

AU - Bánki, P.

AU - Bokor, M.

PY - 2004

Y1 - 2004

N2 - In-situ hydrogen charging (discharging) process was realized in Pd 0.75Ag0.25-H alloys and simultaneous hydrogen concentration and nuclear spin-spin relaxation time measurements were done. Concentration-gradient driven diffusion coefficient was estimated from the hydrogen concentration-charging (discharging) time curve and data for the intrinsic diffusivity were deduced from the spin-spin relaxation time. Two-component spin-spin relaxation was found in the whole hydrogen concentration range, and at high H concentration, one of those is attributed to the hydrogen atoms embedded in the α the other one in the β phase. The diffusional motion is localized up to 105 - 106 intrinsic steps and there is no hydrogen atom exchange between the α and β phases on the time scale of spin-spin relaxation.

AB - In-situ hydrogen charging (discharging) process was realized in Pd 0.75Ag0.25-H alloys and simultaneous hydrogen concentration and nuclear spin-spin relaxation time measurements were done. Concentration-gradient driven diffusion coefficient was estimated from the hydrogen concentration-charging (discharging) time curve and data for the intrinsic diffusivity were deduced from the spin-spin relaxation time. Two-component spin-spin relaxation was found in the whole hydrogen concentration range, and at high H concentration, one of those is attributed to the hydrogen atoms embedded in the α the other one in the β phase. The diffusional motion is localized up to 105 - 106 intrinsic steps and there is no hydrogen atom exchange between the α and β phases on the time scale of spin-spin relaxation.

KW - Chemical Diffusion

KW - Hydrogen Diffusion

KW - Hydrogenated Alloys

KW - Intrinsic Diffusion

KW - Nuclear Magnetic Resonance

KW - PdAg

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M3 - Article

VL - 224-225

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EP - 106

JO - Defect and Diffusion Forum

JF - Defect and Diffusion Forum

SN - 1012-0386

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