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Nor Fatin Khairah Bahanurddin,Mohammad Hafizuddin Jumali,Julie Juliewatty Mohamed,Zainal Arifin Ahmad 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2
Lead Zirconate Titanate (PZT) had previously been used as actuators and sensors in electronic application due to its remarkable piezoelectric properties. The main obstacle in the PZT syntheses through solid state sintering is the lost of substantial amount of PbO due to vaporation that accompanied high firing temperature. Elimination of the calcination step and alternative method of treatment could be of a great help. Thus, an investigation of the lead (Pb) Zirconate Titanate PZT properties (piezoelectric and dielectric) synthesized via solid-state reaction by varying compaction pressure (100-300 MPa) was conducted. Compaction pressure that was beneficial to the physical properties of PZT-based ceramic and also effectively improved the dielectric and piezoelectric properties of the PZT ceramics. Optimum average grain size was found to be a very important factor in determining the alignment of the d33 particle size value influence and the dielectric constant of PZT. Therefore, the optimum compaction pressure (200 MPa) played an important role in optimizing the sintering temperature. This also enhanced/improved the piezoelectric and dielectric properties of PZT.
Role of mixing mediums in the synthesis of single phase CaCu3Ti4O12 (CCTO)
Rosyaini Afindi Zaman,Wan Fahmin Faiz Wan Ali,Mohamad Johari Abu,Julie Juliewatty Mohamed,Mohd. Fadzil Ain,Zainal Arifin Ahmad 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
The role of mixing mediums on synthesizing high purity CCTO as a function of calcination temperature was systematicallyinvestigated via solid state reaction (SSR) route. The efficacy of the mediums (ethanol, deionised water, distilled water, and drymix) was primarily determined by X-ray diffraction (XRD) technique and FESEM, respectively. It is found that, a single phaseCCTO was successfully synthesized in all mediums, with the deionised water showed the lowest reaction temperature (950 oC)to fully crystallize the powder mixtures compared to other mediums. No significant changes were seen in the grain shape sinceonly a bimodal structure with grain size ranging from 0.5 μm to 2.57 μm was observed. The effect of media was also seen intheir dielectric properties of the calcined powders. Dry mixing (DM) had the highest dielectric permittivity (εr = 118) whereasothers are only between 59-99. Therefore, this observation proved that mixing medium could influence the formationtemperature and dielectric properties of CCTO.