Grain Boundary Characteristics of 0.01 mol%V2O5-Doped ZnO-Bi2O3-Based Varistor Ceramics
The effect of 0.01 mol%V2O5 on the grain boundary characteristics of ZnO-Bi2O3-based varistor ceramics is investigated in this work. The average grain size of ZnO was 13.3 µm. The ZnO-Bi2O3 system added with V2O5 content of 0.01 mol% exhibited not only a high nonlinearity, in which the nonlinear coefﬁcient is 25 and the leakage current density is 0.02 µA/mm2 and the voltage gradient of 31.1 V/mm, but also a good grain boundary characteristics, in which barrier height fB = 0.908 eV, depletion layer width w = 32.49 nm, donor density Nd = 0.810×1018 cm-3, and density of interface states Ns = 2.632×1012 cm-2.
Jun Hu and Qi Luo
J. H. Ju et al., "Grain Boundary Characteristics of 0.01 mol%V2O5-Doped ZnO-Bi2O3-Based Varistor Ceramics", Advanced Materials Research, Vol. 320, pp. 240-243, 2011