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http://dx.doi.org/10.3740/MRSK.2005.15.7.453

Effects of Al2O3 on the Piezoelectric Properties of Pb(Mn1/3Nb2/3)O3-PbZrO3-PbTiO3 Ceramics  

Kim Mi-Jung (Department of Materials Sci. & Eng./ReSEM, Chungju National University)
Kim Jae-Chang (Department of Materials Development, Corea Electronics Corporation(CEC))
Kim Young-Min (Department of Materials Development, Corea Electronics Corporation(CEC))
Ur Soon-Chul (Department of Materials Sci. & Eng./ReSEM, Chungju National University)
Kim Il-Ho (Department of Materials Sci. & Eng./ReSEM, Chungju National University)
Publication Information
Korean Journal of Materials Research / v.15, no.7, 2005 , pp. 453-457 More about this Journal
Abstract
Piezoelectric properties of $Pb(Mn_{1/3}Nb_{2/3})O_3-PbZrO_3-PbTiO_3$ ceramics were investigated with $Al_2O_3$ content $(0.0-1.0 wt\%)$. The constituent phases, microstructure, electromechanical coupling factor, dielectric constant, piezoelectric charge and voltage constants were analyzed. Diffraction peaks for (002) and (200) planes were identified by X-ray diffractometer for all the specimens doped with $Al_2O_3$, indicating the MPB (morphotropic phase boundary) composition of tetragonal structures. The highest sintered density of $7.8 g/cm^3$ was obtained for $0.2wt\%\;Al_2O_3-doped$ specimen. Grain size increased by doping $Al_2O_3$ up to $0.3 wt\%$, and it decreased by more doping. Electromechanical coupling factor, dielectric constant, piezoelectric charge and voltage constants increased by doping $Al_2O_3$ up to $0.2wt\%$, and it decreased by more doping. This might result from the formation of oxygen vacancies due to defects in $O^{2-}$ ion sites and the substitution of $Al^{3+}$ ions.
Keywords
PMN-PZT; Piezoelectric;
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