The relationship between silicon carbide particle size and nonlinear coefficient?

The relationship between silicon carbide particle size and nonlinear coefficient
The research results show that for a-siC, the thicker the particle, the lower the resistivity ρo and the larger the nonlinear coefficient β;
The finer the particle, the higher the resistivity ρo and the smaller the nonlinear coefficient β; different types of silicon carbide produced by different factories have different resistivity po and nonlinear coefficient β:
After a-SiC is made into an anti-corona belt, the resistivity increases and the β value decreases. The thicker the particle, the greater the decrease in the β value; the non-linear properties of the anti-corona belt and the powder is similar .