Investigation of the influence of thermal treatment on the morphologies, dielectric and ferroelectric properties of PZT-based ceramics

  • Vittayakorn N
  • Rujijanagul G
  • Cann D
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Pb[(Zr 1/2 Ti 1/2 ) 0.9 (Zn 1/3 Nb 2/3 ) 0.1 ]O 3 (PZT-10PZN) powder was prepared using the columbite precursor method. The phase development of calcined powder precursors was analyzed by X-ray diffraction. Dielectric and ferroelectric properties of the as-sintered and annealed samples were measured and correlated with the microstructure. The morphological evolution was determined by scanning electron microscopy (SEM). The as-sintered ceramic exhibited weak normal-ferroelectric behavior, with a relatively low dielectric constant maximum measured at 1 kHz (ε rmax at 1 kHz) of 13,000. Annealing resulted in a transition to relaxor-ferroelectric-like behavior, a shift in the dielectric maximum temperature from 360 to 350 °C, and a dramatic increase in ε rmax at 1 kHz to a maximum value of 35,000 for the longer anneal. Furthermore, after thermal annealing at 900 °C for 1 week the composition shifted close to the MPB with a great reduction in the transition temperature and a broadening of the dielectric constant maximum. A strong enhancement of the remanent polarization (P r ) was also observed. © 2006 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Ferroelectricity
  • PZT
  • Phase transitions
  • Piezoelectricity

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  • N. Vittayakorn

  • G. Rujijanagul

  • D.P. Cann

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