Synthesis of Ni-B Compounds by High-Pressure and High-Temperature Method

Guiqian Sun; Xingbin Zhao; Lu Chen; Yubo Fu; Wei Zhao; Meiyan Ye; Fei Wang; Qiang Tao; Shushan Dong; Pinwen Zhu

doi:10.1021/acsomega.2c07523

Synthesis of Ni-B Compounds by High-Pressure and High-Temperature Method

ACS Omega. 2023 Mar 2;8(10):9265-9274. doi: 10.1021/acsomega.2c07523. eCollection 2023 Mar 14.

Authors

Guiqian Sun¹, Xingbin Zhao², Lu Chen¹, Yubo Fu¹, Wei Zhao¹, Meiyan Ye¹, Fei Wang¹, Qiang Tao¹, Shushan Dong¹, Pinwen Zhu¹

Affiliations

¹ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.
² Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, People's Republic of China.

Abstract

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 Ni₂B (I4/mcm), α-Ni₄B₃ (Pnma), β-Ni₄B₃ (C2/c), and NiB (Cmcm) are synthesized by high pressure and high temperature (HPHT). The results indicate that synthesizing α-Ni₄B₃ and β-Ni₄B₃ requires more energy than Ni₂B 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.