Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA

J  Bartolome; M D  Kuz'min; C  Kapusta; P C  Riedi; M  Ellouze; P  l'Heritier

doi:10.1016/j.ssc.2003.10.021

Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA

J Bartolome, M D Kuz'min, C Kapusta, P C Riedi, M Ellouze, P l'Heritier

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The La-139 NMR spin-echo spectra of La2Fe14BHx are reported. Since lanthanum has no 4f electrons, the observed quadrupole splittings are directly proportional to the lattice part of the electric field gradient, V-zz(lat). This quantity decreases as the content of interstitial hydrogen x grows. To describe the fall-off of V-zz(lat), a dimensionless function f(2)(x) is introduced, normalised so that f(2)(0) = 1. Analysis of the new and earlier published data obtained by several experimental techniques demonstrates that the reduction of both the second-order crystal field parameter AN and the lattice electric field gradient V-zz(lat) is described by the same function f(2)(x) in all R2Fe14BHx. The only distinction that needs to be made is between R being a light and a heavy rare earth. (C) 2003 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	331-334
Number of pages	4
Journal	Solid State Communications
Volume	129
DOIs	https://doi.org/10.1016/j.ssc.2003.10.021
Publication status	Published - Feb 2004

Keywords

permanent magnets
magnetic anisotropy
hydrogenated intermetallic compounds
electric field gradient
INTERMETALLIC COMPOUNDS
GD NUCLEI

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10.1016/j.ssc.2003.10.021

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@article{73779257561b404bb1a5c87aac5308ec,

title = "Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA",

abstract = "The La-139 NMR spin-echo spectra of La2Fe14BHx are reported. Since lanthanum has no 4f electrons, the observed quadrupole splittings are directly proportional to the lattice part of the electric field gradient, V-zz(lat). This quantity decreases as the content of interstitial hydrogen x grows. To describe the fall-off of V-zz(lat), a dimensionless function f(2)(x) is introduced, normalised so that f(2)(0) = 1. Analysis of the new and earlier published data obtained by several experimental techniques demonstrates that the reduction of both the second-order crystal field parameter AN and the lattice electric field gradient V-zz(lat) is described by the same function f(2)(x) in all R2Fe14BHx. The only distinction that needs to be made is between R being a light and a heavy rare earth. (C) 2003 Elsevier Ltd. All rights reserved.",

keywords = "permanent magnets, magnetic anisotropy, hydrogenated intermetallic compounds, electric field gradient, INTERMETALLIC COMPOUNDS, GD NUCLEI",

author = "J Bartolome and Kuz'min, {M D} and C Kapusta and Riedi, {P C} and M Ellouze and P l'Heritier",

year = "2004",

month = feb,

doi = "10.1016/j.ssc.2003.10.021",

language = "English",

volume = "129",

pages = "331--334",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier",

}

TY - JOUR

T1 - Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA

AU - Bartolome, J

AU - Kuz'min, M D

AU - Kapusta, C

AU - Riedi, P C

AU - Ellouze, M

AU - l'Heritier, P

PY - 2004/2

Y1 - 2004/2

N2 - The La-139 NMR spin-echo spectra of La2Fe14BHx are reported. Since lanthanum has no 4f electrons, the observed quadrupole splittings are directly proportional to the lattice part of the electric field gradient, V-zz(lat). This quantity decreases as the content of interstitial hydrogen x grows. To describe the fall-off of V-zz(lat), a dimensionless function f(2)(x) is introduced, normalised so that f(2)(0) = 1. Analysis of the new and earlier published data obtained by several experimental techniques demonstrates that the reduction of both the second-order crystal field parameter AN and the lattice electric field gradient V-zz(lat) is described by the same function f(2)(x) in all R2Fe14BHx. The only distinction that needs to be made is between R being a light and a heavy rare earth. (C) 2003 Elsevier Ltd. All rights reserved.

AB - The La-139 NMR spin-echo spectra of La2Fe14BHx are reported. Since lanthanum has no 4f electrons, the observed quadrupole splittings are directly proportional to the lattice part of the electric field gradient, V-zz(lat). This quantity decreases as the content of interstitial hydrogen x grows. To describe the fall-off of V-zz(lat), a dimensionless function f(2)(x) is introduced, normalised so that f(2)(0) = 1. Analysis of the new and earlier published data obtained by several experimental techniques demonstrates that the reduction of both the second-order crystal field parameter AN and the lattice electric field gradient V-zz(lat) is described by the same function f(2)(x) in all R2Fe14BHx. The only distinction that needs to be made is between R being a light and a heavy rare earth. (C) 2003 Elsevier Ltd. All rights reserved.

KW - permanent magnets

KW - magnetic anisotropy

KW - hydrogenated intermetallic compounds

KW - electric field gradient

KW - INTERMETALLIC COMPOUNDS

KW - GD NUCLEI

U2 - 10.1016/j.ssc.2003.10.021

DO - 10.1016/j.ssc.2003.10.021

M3 - Article

SN - 0038-1098

VL - 129

SP - 331

EP - 334

JO - Solid State Communications

JF - Solid State Communications

ER -

Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA

Abstract

Keywords

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