Abstract
Investigations of crystal structure and phase transition of Pb(Zr 0.52 Ti 0.48 )O 3 ceramics doped with A-site substitution impurity (La, Nd) or B-site substitution impurity (Sb, Nb) at 2 mol% concentration were carried out. X-ray diffraction patterns of impurities doped Pb(Zr 0.52 Ti 0.48 )O 3 ceramics have been measured at pressures up to ~5 GPa with diamond anvil cell and synchrotron radiation. The patterns were obtained at room temperature using methanol-ethanol mixture as pressure-transmitting media. In order to refine the crystal structure, Rietveld analysis has been performed. The structures of impurities doped Pb(Zr 0.52 Ti 0.48 )O 3 ceramics are tetragonal in space group P4mm at ambient pressure and are transformed into a cubic phase in space group Pm m as the pressure increases. In this study, when A-site substitution donor La 3+ or Nd 3+ ion was added to Pb(Zr 0.52 Ti 0.48 )O 3 ceramics, the phase transition phenomena showed up at the pressure of 2.5~4.6 GPa, but when B-site substitution donor Nb 5+ or Sb 5+ ion was added to it, the phase transition appeared at relatively lower pressure of 1.7~2.6 GPa.
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