Abstract:
In this research, the study of BaTi03 addition on the microstructure and electrical
properties of ZnO based varistor ceramic have been studied. The ZnO is added with 3,
6, and 9 wt. % of BaTi03 by the solid-state method using planetary ball milling and
sintered at 900, 1100, and l300
C for 45 minutes. The sample of un-doped ZnO is
prepared for comparison. X-Ray Diffraction (XRD) spectra for the commercial ZnO
and BaTiQ3 confirmed that the samples do not have any impurity. From the XRD
pattern analysis, samples exhibited a primary and secondary phases of the compound
and high crystallinity. Scanning Electron Microscope (SEM) equipped with Energy
Dispersive X-Ray Spectroscopy (EDX) images show an improvement of the grains
size and uniformity of the microstructure of ZnO as the increasing of the wt. % of the
BaTi03 and sintering temperatures. Then, the functional group is observed by Fourier
Transform Infrared (FTIR). The Current-Voltage (I-V) characteristic measurement,
the value of non-linearity coefficient is in the range of 1.0-15.0. In conclusions, the
evolution of surface morphology due to BaTiQ3 addition is observed in the ZnO based
ceramic varistor and is correlated to their electrical characteristics.
