Sun Guiqian, Zhao Xingbin, Chen Lu, Fu Yubo, Zhao Wei, Ye Meiyan, Wang Fei, Tao Qiang, Dong Shushan, Zhu Pinwen
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.
Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, People's Republic of China.
ACS Omega. 2023 Mar 2;8(10):9265-9274. doi: 10.1021/acsomega.2c07523. eCollection 2023 Mar 14.
Nickel borides are promising multifunctional materials for high hardness and excellent properties in catalysis and magnetism. However, it is still a blank of intrinsic properties in Ni-B compounds, because crystallization of the single phases of Ni-B compounds with micro-size is a challenge. In this work, single phases of NiB (4), α-NiB (), β-NiB (2), and NiB () are synthesized by high pressure and high temperature (HPHT). The results indicate that synthesizing α-NiB and β-NiB requires more energy than NiB and NiB. The growth process of Ni-B compounds is that Ni covers B to form Ni-B compounds under HPHT, which also makes the slight excess of B necessary. So, generating homogeneous distribution of starting materials and increasing the interdiffusion between Ni and B are two keys to synthesize well crystallized and purer samples by HPHT. This work uncovers the growth process of Ni-B compounds, which is significant to guide the synthesis of highly crystalline transition metal borides (TMBs) in the future.
硼化镍是一种很有前景的多功能材料，具有高硬度以及在催化和磁性方面的优异性能。然而，Ni-B化合物的本征性质仍是一个空白，因为制备具有微米尺寸的Ni-B化合物单相晶体是一项挑战。在这项工作中，通过高温高压（HPHT）合成了NiB (4)、α-NiB ()、β-NiB (2) 和NiB () 的单相。结果表明，合成α-NiB和β-NiB比合成NiB和NiB需要更多能量。Ni-B化合物的生长过程是在高温高压下Ni覆盖B形成Ni-B化合物，这也使得B略微过量成为必要条件。因此，使原料均匀分布并增加Ni和B之间的相互扩散是通过高温高压合成结晶良好且更纯净样品的两个关键。这项工作揭示了Ni-B化合物的生长过程，这对未来指导高结晶度过渡金属硼化物（TMBs）的合成具有重要意义。
