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Boron nitride The first application of hexagonal Boron Nitride, or hBN, was as a lubricant for high temperatures. hBN has a similar structure and performance to graphite. Because it is white, it is often called white graphite.The hexagonal structure of boron is nitride. It is the most common graphite-like lattice. However, there are also amorphous forms. Other crystal forms of Boron Nitride exist, in addition to hexagonal boronnitride. These include: rhombohedral, cubic, and wurtzite boronnitride. There are even two-dimensional boron crystals that look like graphene.
Wentorf created cubic BN first in 1957. Pure hexagonal boron nitride can be directly converted into cubic boron nitride when the temperature reaches or exceeds 1700degC, and the pressure at the minimum is 11-12 GPa. The use of a catalyst can reduce both the transition pressure and temperature. The most common catalysts include alkali metals and alkaline nitrides. Ammonium borate is the least expensive catalyst, but also requires the lowest pressure and temperature. At 1500, the required pressure is 5GPa and at 600700 degrees Fahrenheit the required pressure is 6GPa. Although the addition of catalysts can significantly reduce the temperature and pressure required for the transition, they are still quite high. The preparation equipment for this catalyst is complex and expensive, and the industrial applications are limited.

You can prepare boron nitride in several ways
1.Chemical vapor synthesis
Sokolowski was the first to use pulsed-plasma technology in 1979 for the preparation of cubic boron (CBN), at low temperature, and under low pressure. Equipment is simple, and the process can be easily realized. This has led to rapid development. There are many vapor deposition techniques. In the past, the term was used to describe mainly thermal chemical vapour deposition. The experimental device consists of a heat-resistant glass tube and a heater. The substrate may be heated using a heating furnace or by high-frequency electromagnetic induction (cold-wall PVD). The reaction gases decompose on the surface the substrate at high temperatures, while a chemical reactions occurs to deposit film. The reaction is a gas mixture of BCl3 and B2H4 or NH3.
2.Hydrothermal Synthesis
Water is used as a reaction medium to dissolve insoluble and insoluble substances in an autoclave environment of high temperature and high pressure. The reaction can be recrystallized. It is also carried out within a sealed container, which prevents the components from escaping. This method is used at low temperatures to synthesize cubic Boron Nitride.
3.Benzene Thermal Synthesis
In recent years, the benzene thermochemical synthesis has attracted a lot of attention as a low temperature method for synthesising nanomaterials. The conjugated structure of benzene makes it an ideal solvent for solvothermal syntheses. It has been successfully adapted to benzene thermo synthesis, including the reaction formula.
The reaction temperature for this technology is only 450degC. A metastable phase can only be created under extreme conditions of low pressure and temperature, and it can only exist at ultra-high pressure. This method is able to produce cubic boron at low temperatures and low pressure. The method is still under experimental research and has great application potential.
Self-propagating technology
The energy needed from the outside is used for high exothermic reactions. The system then reacts locally, forming a chemical reaction wave (combustion front). The chemical reactions are accelerated with its own heat and spread across the system. It is an inorganic method that has been around for a long time. However, this particular method was used to synthesize boron oxide only in recent years.

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