Difference between cubic and hexagonal boron nitride
Boron nitride (BN) is a crystal composed of
nitrogen and boron atoms. It has four different variants: hexagonal boron
nitride (h-BN), rhombohedral boron nitride (r-BN), cubic boron nitride (c-BN)
and wurtzite boron nitride.
This paper mainly describes the knowledge
of hexagonal boron nitride and cubic boron nitride in boron nitride variants,
and analyzes their differences and differences.
Figure1. Hexagonal boron nitride(left) and cubic boron nitride (right)
1. Hexagonal boron nitride
Hexagonal boron nitride (h-BN), also known
as "white graphene", is a two-dimensional monoatomic layer material
composed of nitrogen and boron atoms alternately. Its layered arrangement is
AA'AA' Type. Its structure is similar to that of graphene, so it also has many
properties similar to that of graphene.
Hexagonal boron nitride (h-BN) is a kind of
graphite crystal lattice, which is loose, lubricated, easy to absorb moisture,
light, insoluble and high temperature resistant white powder. Hexagonal boron
nitride has no obvious melting point, has the property of resistance to
chemical erosion, and does not react with general metals, rare earth metals,
precious metals, glass, molten salts, etc.
Hexagonal boron nitride is an excellent
insulator with high thermal conductivity, high oxidation resistance, high
chemical and thermal stability and good mechanical properties. It has important
applications in composite material modification, sensors, field emission
devices, ultraviolet laser devices and oxidation resistant coatings.
2. Cubic boron nitride
Cubic boron nitride (c-BN) is a kind of
synthetic material. Its hardness is second only to diamond and belongs to super
hard material. It is synthesized by hexagonal boron nitride and catalyst under
high temperature and high pressure.
Cubic boron nitride (CBN) has black, amber
and metal plating color. Its particle size is usually less than 1 mm, and it
has high thermal stability and chemical inertia. Therefore, CBN is often used
as a material for making super hard cutting tools.
Therefore, the main difference between
hexagonal boron nitride and cubic boron nitride lies in their physical
properties
Hexagonal boron nitride is white, while
cubic boron nitride is mostly black and amber;
Hexagonal boron nitride is soft, while
cubic boron nitride has high hardness;
Hexagonal boron nitride can be used as raw
material to synthesize cubic boron nitride;
Hexagonal boron nitride is widely used as
ceramics, and cubic boron nitride is generally used to make CBN tools.