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

摘要

ZnO-based compound conductive ceramics were successfully prepared from ZnO-ZnAl_2O_4-SiO_2-Y_2O_3-MgO at 1360℃ 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.