ZnO-based compound conductive ceramics applied in high-frequency electric field

ZnO-based compound conductive ceramics were successfully prepared from ZnO–ZnAl₂O₄–SiO₂–Y₂O₃–MgO at 1360 °C for 3 h by the conventional ceramics method in air, and the effects of the comprehensive electrical properties with MgO changes were studied in detail. Structural and morphological characteristics of the as-prepared samples were investigated by environment scanning electron microscope (ESEM) and X-ray diffraction respectively. The properties of impedance–frequency and complex impendence reveal that the as-prepared samples could be applied in the high-frequency electric field, and the resistivity of grains and grain-boundaries have no significant difference. The dielectric properties indicate the existence of Maxwell–Wagner interfacial polarization in the matrixes. The resistivity–temperature (R–T) characteristics and the linear current–voltage (I–V) properties indicate that the conduction mechanism of ZnO-based conductive ceramics composition is thermally activated progress, and the grain-boundary effect is negligible respectively.