Table 3: Logarithm value of current density under different conditions (lg j) [19].

(V/cm) (K)
15002000250030003500

 = 4.0 eV
 2 × 1071.723.434.645.466.05
 4 × 1075.726.116.566.987.35
 = 4.5 eV
 2 × 107−1.462.203.644.635.38
 4 × 1074.535.015.616.176.65
 = 5 eV
 2 × 107−1.630.912.633.784.63
 4 × 1073.283.874.635.345.99