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Title: NMR and Moessbauer studies of the amorphous system Fe/sub 79/P/sub 21-x/B/sub x/

Abstract

Combined NMR, spin-echo and Moessbauer experiments have been performed to obtain hyperfine field distributions of the transition metal and metalloid elements in splat-cooled amorphous Fe/sub 79/P/sub 21//sub -x/B/sub x/ alloys. These distributions are related to the local environments of the elements. The NMR signals are observed in the low frequency range 20-60 MHz and all the nuclei, i.e. Fe, P and B, may contribute to the spectral distribution. The resolution of the spectra into that due to Fe and (P + B) nuclei was made possible by using samples prepared with an Fe/sup 56/ isotope. The Fe distribution thus obtaned shows general agreement with the Moessbauer field distribution. From a careful analysis of the NMR data, the hyperfine field at the B nuclei in these amorphous alloys is found to range from 24 to 26 KG increasing with B content. An upper limit of 8 KG for the half-width is attributed to this distribution. The Moessbauer spectra of the Fe/sup 57/ nuclei resemble those for the crystalline Fe/sub 75/P/sub 25//sub -x/B/sub x/ alloys. A fit of the spectra shows a field distribution which suggests the presence of structure. Such a structure may correspond to various Fe sites, also seen inmore » the crystalline alloys. The distributions generally lie between about 160 and 330 KG, with a maximum at about 260 KG. These spectra do not show the presence of Fe nuclei with essentially zero hyperfine field as was obtained for amorphous Fe-Pd-P by Sharon et al. and for amorphous Fe-P by Logan et al. With increasing B content the center of gravity of the Fe distribution shifts to higher values. From a systematic study of the NMR lines and other considerations it is concluded that the P field distribution is broad and its hyperfine field is between 20 and 35 KG for the higher P concentration alloys.« less

Authors:
;
Publication Date:
Research Org.:
California Inst. of Tech., Pasadena (USA). W.M. Keck Lab. of Engineering Materials
OSTI Identifier:
7099164
Report Number(s):
CALT-822-95
TRN: 77-015217
DOE Contract Number:  
EY-76-C-03-0822
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON 56; NUCLEAR MAGNETIC RESONANCE; IRON 57; IRON BORIDES; HYPERFINE STRUCTURE; IRON PHOSPHIDES; AMORPHOUS STATE; MOESSBAUER EFFECT; BORIDES; BORON COMPOUNDS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; INTERMEDIATE MASS NUCLEI; IRON COMPOUNDS; IRON ISOTOPES; ISOTOPES; MAGNETIC RESONANCE; NUCLEI; PHOSPHIDES; PHOSPHORUS COMPOUNDS; PNICTIDES; RESONANCE; STABLE ISOTOPES; TRANSITION ELEMENT COMPOUNDS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Amamou, A., and Durand, J. NMR and Moessbauer studies of the amorphous system Fe/sub 79/P/sub 21-x/B/sub x/. United States: N. p., 1977. Web. doi:10.2172/7099164.
Amamou, A., & Durand, J. NMR and Moessbauer studies of the amorphous system Fe/sub 79/P/sub 21-x/B/sub x/. United States. https://doi.org/10.2172/7099164
Amamou, A., and Durand, J. 1977. "NMR and Moessbauer studies of the amorphous system Fe/sub 79/P/sub 21-x/B/sub x/". United States. https://doi.org/10.2172/7099164. https://www.osti.gov/servlets/purl/7099164.
@article{osti_7099164,
title = {NMR and Moessbauer studies of the amorphous system Fe/sub 79/P/sub 21-x/B/sub x/},
author = {Amamou, A. and Durand, J.},
abstractNote = {Combined NMR, spin-echo and Moessbauer experiments have been performed to obtain hyperfine field distributions of the transition metal and metalloid elements in splat-cooled amorphous Fe/sub 79/P/sub 21//sub -x/B/sub x/ alloys. These distributions are related to the local environments of the elements. The NMR signals are observed in the low frequency range 20-60 MHz and all the nuclei, i.e. Fe, P and B, may contribute to the spectral distribution. The resolution of the spectra into that due to Fe and (P + B) nuclei was made possible by using samples prepared with an Fe/sup 56/ isotope. The Fe distribution thus obtaned shows general agreement with the Moessbauer field distribution. From a careful analysis of the NMR data, the hyperfine field at the B nuclei in these amorphous alloys is found to range from 24 to 26 KG increasing with B content. An upper limit of 8 KG for the half-width is attributed to this distribution. The Moessbauer spectra of the Fe/sup 57/ nuclei resemble those for the crystalline Fe/sub 75/P/sub 25//sub -x/B/sub x/ alloys. A fit of the spectra shows a field distribution which suggests the presence of structure. Such a structure may correspond to various Fe sites, also seen in the crystalline alloys. The distributions generally lie between about 160 and 330 KG, with a maximum at about 260 KG. These spectra do not show the presence of Fe nuclei with essentially zero hyperfine field as was obtained for amorphous Fe-Pd-P by Sharon et al. and for amorphous Fe-P by Logan et al. With increasing B content the center of gravity of the Fe distribution shifts to higher values. From a systematic study of the NMR lines and other considerations it is concluded that the P field distribution is broad and its hyperfine field is between 20 and 35 KG for the higher P concentration alloys.},
doi = {10.2172/7099164},
url = {https://www.osti.gov/biblio/7099164}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 01 00:00:00 EDT 1977},
month = {Sun May 01 00:00:00 EDT 1977}
}