Title

Magnetic Properties of Interstitial Nitrides with the η-carbide Structure

Alternative Title

Co2Ge1-xGaxMo3N
(0 < x ≤ 0.7), Co2-xFexGeMo3N (0 ≤ x ≤ 2)
and Co2-xFexGe0.5Ga0.5Mo3N
(0 ≤ x ≤ 0.8) have been synthesized by the reductive nitridation of binary
oxides and studied using magnetometry, transport measurements, neutron
diffraction, Mössbauer spectroscopy and DFT calculations. They adopt the cubic η-carbide structure and show a resistivity of ~10-3 Ω cm. No
long-range magnetic order was detected in Co2GeMo3N but antiferromagnetic
ordering occurs at 90 K in Co2Ge0.3Ga0.7Mo3N.
The magnetic structure consists of an antiferromagnetic arrangement of
ferromagnetic Co4 groups, with an ordered magnetic moment of 0.48(9)
B per cobalt
atom. The same magnetic structure is found in Co0.5Fe1.5GeMo3N
and Co1.2Fe0.8Ge0.5Ga0.5Mo3N.
The former orders above room temperature with an average moment of 1.08(3) B
per transition-metal site, and the latter at 228 K with an average moment of
1.17(4) B per site. Complete replacement of Co by Fe results in ordering
at 455 K.

Meeting Name

241st National Meeting and Exposition of the American-Chemical-Society (ACS) (2011: Mar. 27- 31, Anaheim, CA)

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0065-7727

Electronic OCLC #

68733575

Print OCLC #

1123848

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 American Chemical Society (ACS), All rights reserved.

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