sup 57 Fe Moessbauer studies of Nd sub 2 Fe sub 14 B and Nd sub 2 Fe sub 12. 5 Si sub 1. 5 B ( T =77--300 K)

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.8617· OSTI ID:6884574

Li, Z W; Zhou, X Z; Morrish, A H ^[1]

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1. Department of Physics, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2 (CA)

{sup 57}Fe Moessbauer effects of Nd{sub 2}Fe{sub 14}B and Nd{sub 2}Fe{sub 12.5}Si{sub 1.5}B have been studied in a temperature range of 77--300 K. The distribution of silicon atoms over the six sites and the dependences of {ital H}{sub hf}, {Delta}, and {delta} on the temperature for the {sup 57}Fe isotope have been deduced by fitting the Moessbauer spectra. The results show that about 80% of the silicon atoms occupy the {ital k}{sub 2} site in Nd{sub 2}Fe{sub 12.5}Si{sub 1.5}B. Meanwhile, silicon substitution for iron raises the Curie temperature and reduces the temperature coefficients of the hyperfine fields at the six iron sites, especially the {ital j}{sub 1} site. The results are interpreted in terms of a decrease of the magnitude of the negative exchange interaction between the {ital j}{sub 1}-{ital k}{sub 2} atoms.

• OSTI ID: 6884574
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
CRYSTAL STRUCTURE
CURIE POINT
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IRON 57
IRON ALLOYS
IRON ISOTOPES
ISOTOPES
MAGNETIC PROPERTIES
MEDIUM TEMPERATURE
MOESSBAUER EFFECT
NEODYMIUM ALLOYS
NUCLEI
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SILICON ALLOYS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE