Nuclear magnetic resonance study of the Nd{sub 2}Co{sub 17}A{ital {sub x}}(A=N,H) compounds

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365428· OSTI ID:496500

Kapusta, C ^[1]; Riedi, P C; Tomka, G J ^[2]; Mycielski, R ^[1]

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1. Department of Solid State Physics, Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, 30-059 Cracow (Poland)
2. Department of Physics and Astronomy, J. F. Allen Laboratories, University of St. Andrews, KY16 9SS Scotland (United Kingdom)

The {sup 145}Nd, {sup 143}Nd, and {sup 59}Co nuclear magnetic resonance (NMR) spin-echo spectra and echo decays for Nd{sub 2}Co{sub 17} and its interstitial nitride, Nd{sub 2}Co{sub 17}N{sub 3} and hydride Nd{sub 2}Co{sub 17}H{sub 3.6} at 4.2 and 77 K at zero field and in applied fields of up to 5 T are reported. The Nd quadrupole splitting of 3.88 MHz for {sup 145}Nd in Nd{sub 2}Co{sub 17} is reduced to 0.37 MHz for Nd{sub 2}Co{sub 17}N{sub 3}. The value for Nd{sub 2}Co{sub 17}H{sub 3.6} is 3.66 MHz. The reduction of quadrupole splitting for Nd{sub 2}Co{sub 17}N{sub 3} as compared to the host Nd{sub 2}Co{sub 17} is 50{percent} larger than for the isostructural Nd{sub 2}Fe{sub 17}N{sub 3} and is assigned to a huge increase in the magnitude of the lattice electric field gradient at the Nd site and, thus to a huge rise of magnetocrystalline anisotropy caused by neighboring N atoms, whereas H atoms have only a slight influence on both quantities. The {sup 59}Co spectrum of the nitride is much different from that of the host compound indicating a large influence of N neighbors on Co hyperfine fields, whereas only minor changes are observed after hydriding. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496500
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
FERROMAGNETIC MATERIALS
HYDRIDES
INTERSTITIALS
MAGNETIZATION
NEODYMIUM ALLOYS
NEODYMIUM COMPOUNDS
NITRIDES
NMR SPECTRA
PERMANENT MAGNETS
SPIN ECHO