A Comparative Study between the Effects of Magnetic and Nonmagnetic Dopants on the Properties of ZnO Varistors

Table 1

(a) Density, leakage currents, and nonlinear coefficients of Al-doped ZnO varistor

Al content	𝜌 (gm/cm^3)	𝐼𝑔 (A)	𝛼1	𝛼3
0.00	5.37	1.51×10^−4	2.04	2.09
0.025	6.29	2.46×10^−4	0.21	1.63
0.05	6.94	2.97×10^−4	0.24	1.43
0.10	5.30	2.82×10^−4	0.22	1.47
0.20	4.35	3.01×10^−4	0.09	1.61

(b) Density, leakage currents, and nonlinear coefficients of Mn-doped ZnO varistor

Mn content	𝜌 (gm/cm^3)	𝐼𝑔 (A)	𝛼1	𝛼3
0.00	5.37	1.51×10^−4	2.04	2.09
0.025	5.16	3.32×10^−5	1.45	1.56
0.05	3.88	2.91×10^−5	1.28	2.19
0.10	3.76	55.5×10^−4	0.51	1.98
0.20	3.77	75.6×10^−4	0.34	1.70