Lead zirconatetitanate Pb(Zr 0.52 Ti 0.48 )O 3 , (PZT) from a mixture of commercial PbO, TiO 2 and ZrO 2 powders was successfully prepared using a planetary ball mill. The microstructure and electrical properties of PZT ceramic were found to be highly sensitive to the sintering condition. The influence of microstructure and electrical properties on the sintering condition of the samples was studied. SEM analysis indicated that a shorter sintering time with higher sintering temperature promotes fine structure and densification. This was proves where the relative density of the sintered PZT ceramics obtained was measured to be approximately 99% of the theoretical density. The electrical properties of the ceramic sintered at a higher temperature with a different sintering time were measured at high frequencies. The result revealed that different sintering conditions have a big impact on electrical behavior in a broad frequency region.

No abstract

Pb (Zr0.52Ti0.48)O3, (PZT) powder has been synthesized using high energy ball milling technique. The synthesized powders were characterized using XRD, SEM, Density, Porosity and Impedance Analyzer. XRD patterns show that the perovskite phase of PZT can be formed from the mixture of starting material after milling for 40 h. The grain sizes of the powder have been estimated to be 1-3 μm. The relationship between the microstructure of the PZT samples and sintering temperature has been discussed. Dense PZT (> 95 % theoretical density) with excellent dielectric properties was obtained when the pellet are sintered at higher temperature with shorter soaking time. The results show that the sample sintered at 1100 °C /1 h yields a clearly uniform grain size with the highest dielectric constant.

Recently, pure PZT have been used as a piezofan in electronic application. Properties that piezoelectric fan should have are high mechanical piezoelectric coupling factor, high dielectric constant, easily polarized and high piezoelectric charge constant. Soft PZT is a suitable candidate to fulfill this requirement. The samples will be prepared via high planetary mill; due to this process can skip calcinations process, which can reduce a lot of cost. This process also can avoid PbO loss during sintering process. The microstructure and electrical properties of PZTceramic were found to be more sensitive to the sintering condition. Preliminary works have been done in order to find a suitable sintering duration in order to produce a good PZT formation. SEM analysis indicated that shorter sintering time promotes fine structure and densification. This have been proves where relative density of the obtained sintered PZT ceramics was measured to be approximately 99 % of the theoretical density.

The properties of undoped and La-doped CaCu3Ti4O12 ceramics synthesized via solid state reaction under argon environment had been studied. It was found that La-doped CCTOs gave higher dielectric constant and lower dielectric loss than undoped CCTO. X-ray diffraction (XRD) analysis indicated that all of the sintered samples have single-phase cubic structure (space group ). A minor shifted was observed in the peak positions for La-doped samples, which are attributed to the lattice expansion. The lattice parameter obtained from XRD analysis is 7.348 Å for undoped CCTO and increases to 7.348 – 7.377 Å for La-doped CCTOs. The results proven that La ions have effectively substituted into the Ca site of CCTO.