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Crystal Structure and Magnetic Properties of Hexagonal FeCo Nitrides Prepared Using Ammonia Gas Nitrification

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-03-27 DOI:10.1109/LMAG.2023.3262452

Chihiro Kodaka;Mikio Kishimoto;Eiji Kita;Hideto Yanagihara

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引用次数: 0

Abstract

Single-phase

$\varepsilon$

-(FeCo)_xN compound particles with

$x$

= 2.25–2.48 were synthesized using ammonia gas nitrification. The mass magnetization

$M$

at 10 K under a magnetic field of 9 T was 77 A

$\cdot$

$^{2}$

/kg, and Curie temperature

$T$

_C was 100 K for

$x$

= 2.48. These values decreased with increasing nitrogen content. Compared with

$\varepsilon$

-Fe_xN, (FeCo)_xN had significantly lower

$M$

and

$T$

_C values, even at comparable nitrogen content. Mössbauer spectroscopy suggests that the magnetic moment of Co decreases with increasing nitrogen content and disappears at approximately

$x$

= 2.35, even at the lowest measurement temperature of

$T$

= 3 K. Griffiths phaselike magnetic behavior was observed in the temperature dependence of magnetic susceptibility. The experimental results indicate that the Fe–Fe interaction may change from ferromagnetic to antiferromagnetic at

$x$

= 2.25 when the nitrogen content is low.

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氨气氮化制备六方氮化铁钴的晶体结构和磁性能

采用氨气硝化法合成了$x$=2.25–2.48的单相$\varepsilon$-（FeCo）xN化合物颗粒。在9T磁场下10K下的质量磁化强度$M$为77A$\cdot$M$^｛2｝$/kg，居里温度$T$C为100K，$x$=2.48。这些数值随着氮含量的增加而降低。与$\varepsilon$-FexN相比，（FeCo）xN的$M$和$T$C值显著较低，即使在氮含量相当的情况下也是如此。Mössbauer谱表明，Co的磁矩随着氮含量的增加而减小，并且在大约$x$=2.35时消失，即使在最低测量温度$T$=3K时也是如此。在磁化率的温度依赖性中观察到Griffiths类相磁行为。实验结果表明，当氮含量较低时，在$x$=2.25时，Fe–Fe相互作用可能从铁磁变为反铁磁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.