Zhang Shoufeng, Zhou Chao, Wang Xin, Bao Kuo, Zhao Xingbin, Zhu Jinming, Tao Qiang, Ge Yufei, Yu Zekun, Zhu Pinwen, Zhao Wei, Cheng Jia'en, Ma Teng, Ma Shuailing, Cui Tian
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China.
Materials (Basel). 2022 Nov 4;15(21):7780. doi: 10.3390/ma15217780.
High-quality 622 MnN samples were synthesised using a high-pressure metathesis reaction, and the properties of the material were investigated. The measurements revealed that the Vickers hardness was 7.47 GPa, which is less than that predicted by commonly used theoretical models. At low air pressure, MnN and MnO coexist at 500 to 600 °C, and by excluding air, we succeeded in producing MnN by heating MnN in nitrogen atmosphere; we carefully studied this process with thermogravimetry and differential scanning calorimetry (TG-DSC). This gives a hint that to control temperature, air pressure and gas concentration might be an effective way to prepare fine Mn-N-O catalysis. Magnetic measurements indicated that ferromagnetism and antiferromagnetism coexist within MnN at room temperature and that these magnetic properties are induced by nitrogen vacancies. Ab intio simulation was used to probe the nature of the magnetism in greater detail. The research contributes to the available data and the understanding of MnN and suggests ways to control the formation of materials based on MnN.
通过高压复分解反应合成了高质量的622 MnN样品，并对该材料的性能进行了研究。测量结果表明，维氏硬度为7.47 GPa，低于常用理论模型预测的值。在低气压下，MnN和MnO在500至600°C共存，通过排除空气，我们成功地在氮气氛中加热MnN制备出了MnN；我们用热重分析和差示扫描量热法（TG-DSC）仔细研究了这个过程。这表明控制温度、气压和气体浓度可能是制备精细Mn-N-O催化剂的有效方法。磁性测量表明，室温下MnN中同时存在铁磁性和反铁磁性，这些磁性特性是由氮空位引起的。采用第一性原理模拟更详细地探究了磁性的本质。该研究为MnN的现有数据和理解做出了贡献，并提出了控制基于MnN的材料形成的方法。
