Magnetic Properties of Interstitial Nitrides with the η-carbide Structure
(0 < x â¤ 0.7), Co2-xFexGeMo3N (0 â¤ x â¤ 2)
(0 â¤ x â¤ 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 Î·-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
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.
P. D. Battle et al., "Magnetic Properties of Interstitial Nitrides with the η-carbide Structure," Proceedings of the 241st National Meeting and Exposition of the American-Chemical-Society (2011, Anaheim, CA), vol. 241, no. 22, pp. 15606-15613, American Chemical Society (ACS), Mar 2011.
241st National Meeting and Exposition of the American-Chemical-Society (ACS) (2011: Mar. 27- 31, Anaheim, CA)
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01 Mar 2011