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JOURNAL OF SYNTHETIC CRYSTALS ›› 2022, Vol. 51 ›› Issue (5): 881-892.

Special Issue: 超硬材料与特殊环境晶体生长技术

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Transition Metal Light Elements Compounds Synthesized by High Pressure and High Temperature

YOU Cun, ZHAO Wei, WANG Xin, DONG Shushan, TAO Qiang, ZHU Pinwen   

  1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • Received:2022-02-16 Online:2022-05-15 Published:2022-06-17

Abstract: Transition metal light elements compounds (TMLEs) are a kind of robust functional materials due to high hardness, high melting point, superior conductivity, magnetic properties, and superconductivity. The combination of excellent mechanical properties and functionality makes TMLEs special materials used in extreme environments. However, synthesizing TMLEs need high pressure and high temperature (HPHT) conditions to overcome the energy barrier. Although many TMLEs were synthesized by HPHT, the growth mechanism is still mysterious. Summary of TMLEs synthesized by HPHT is significant to understand the growth process and develop of new TMLEs. In this work, the TMLEs synthesized by HPHT which include our groups research experience and other relevant literatures are summarized. The TMLEs include transition metal borides (TMBs), transition metal carbides (TMCs), and transition metal nitrides (TMNs). The starting materials, experimental conditions, and morphologies etc. are analyzed. The main results are as follows: proportion of starting materials and the suitable temperature are very important to obtain the single phase of TMBs; the boron subunit in TMBs is related to growth kinetics, which induces step growth process; choosing different starting materials of carbon and nitrogen will define the growth process of TMLEs. Synthesizing single crystal with millimeter size in the future is meaningful to understand the basic properties of TMLEs. The new structures of TMLEs with high content of light elements still need to be developed. With the development of new materials, TMLEs will be a kind of irreplaceable robust materials in the future.

Key words: transition metal light element, transition metal boride, transition metal carbide, transition metal nitride, high pressure and high temperature, crystal growth, large volume pressure apparatus, high metaling point

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