TY - GEN
T1 - Effect of MnO2 impurity on the PZT-PMN system ceramics for piezoelectric transformer
AU - Suwan, Y.
AU - Niyompan, A.
AU - Tipakontitikul, R.
AU - Laoratanakul, P.
PY - 2008
Y1 - 2008
N2 - The PZT-PMN ceramics system was derived from Pb(Zr0.5Ti 0.5)O3 and Pb(Mg2/3Nb1/3)O 3 based compositions those obtained via the columbite method. The effect of MnO2 addition on microstructure, physical properties and piezoelectric properties were investigated. In this study, the composition with PZT/PMN ratio of 1:1 was selected. To observe the effect of MnO2 adding, its concentration was varied in range 0-10 mol%. Green pellets were sintered at temperature 1250°C for 4 hours. For piezoelectric investigation, the ceramics pellets were subjected to a poling process. The XRD results show that there is no phase transformation observed for all sintered PZT-PMN samples with presence of MnO2. The SEM micrographs reveal that MnO 2 can enhance sinterability as evidenced by lowering of porosity and increasing of grain size with increasing of MnO2 content. Increasing of linear shrinkage and apparent densities also confirmed such effect. Improvement of d33 from 28 to 114 pC/N could only found for MnO 2 in range 0 to 4 mol%. For higher MnO2 content, there is only slightly increased. However, increasing of kpwith increasing of MnO2 is clearly observed. While dielectric constant measured at room temperature and at frequency 1 kHz is higher for ceramics without MnO 2 doping and it decreases with increasing MnO2 concentration. The temperature dependence of relative dielectric constant go to peak of value about 6000 at temperature around 180°C and shifting of these peaks with frequency can only be observed for samples with higher MnO 2 content. This indicates a normal ferroelectric behavior for sample with lower MnO2 and there are converted to relaxor after MnO 2 increased.
AB - The PZT-PMN ceramics system was derived from Pb(Zr0.5Ti 0.5)O3 and Pb(Mg2/3Nb1/3)O 3 based compositions those obtained via the columbite method. The effect of MnO2 addition on microstructure, physical properties and piezoelectric properties were investigated. In this study, the composition with PZT/PMN ratio of 1:1 was selected. To observe the effect of MnO2 adding, its concentration was varied in range 0-10 mol%. Green pellets were sintered at temperature 1250°C for 4 hours. For piezoelectric investigation, the ceramics pellets were subjected to a poling process. The XRD results show that there is no phase transformation observed for all sintered PZT-PMN samples with presence of MnO2. The SEM micrographs reveal that MnO 2 can enhance sinterability as evidenced by lowering of porosity and increasing of grain size with increasing of MnO2 content. Increasing of linear shrinkage and apparent densities also confirmed such effect. Improvement of d33 from 28 to 114 pC/N could only found for MnO 2 in range 0 to 4 mol%. For higher MnO2 content, there is only slightly increased. However, increasing of kpwith increasing of MnO2 is clearly observed. While dielectric constant measured at room temperature and at frequency 1 kHz is higher for ceramics without MnO 2 doping and it decreases with increasing MnO2 concentration. The temperature dependence of relative dielectric constant go to peak of value about 6000 at temperature around 180°C and shifting of these peaks with frequency can only be observed for samples with higher MnO 2 content. This indicates a normal ferroelectric behavior for sample with lower MnO2 and there are converted to relaxor after MnO 2 increased.
KW - MnO doping
KW - PZT-PMN ceramics
KW - Piezoelectric transformer
UR - https://www.scopus.com/pages/publications/62949217876
M3 - Conference contribution
AN - SCOPUS:62949217876
SN - 9780878493562
T3 - Advanced Materials Research
SP - 189
EP - 192
BT - Smart Materials - Int. Conf. Smart Materials Smart/Intelligent Materials and Nanotechnology, (Smartmat-'08) and the 2nd International Workshop on Functional Materials and Nanomaterials, (IWOFM-2)
ER -