Investigation on the Mechanical and Ferroelectric Properties of the Porous PZT 95/5 Ceramics

doi:10.3724/SP.J.1077.2014.13563

Abstract

Abstract:

Porous lead zirconate titanate (PZT95/5) ceramics were prepared by adding pore formers. The effects of pore structures including porosity, pore size and pore shape on the mechanical and ferroelectric properties of the porous PZT95/5 ceramics and their mechanisms were investigated, and the relationships between the microstructures and the mechanical and ferroelectric properties were revealed. The results showed that increase in porosity improved the acoustic impedance matching between ceramics and encapsulating materials by reducing the sound impedance values. With increase in porosity, the yield stress and remnant polarization (P_r) of the porous PZT95/5 ceramics decreased, while the coercive electric field increased. The porous PZT95/5 ceramics with spherical pores exhibited higher yield stress and remnant polarization (P_r) than that with irregular pores. The porous PZT95/5 ceramics with larger pore size exhibited lower yield stress and remnant polarization. However, compared with pore shape, pore size had minor effects on the yield stress and remnant polarization properties of the porous PZT95/5 ceramics. The effect of pore structure on the yield stress could be explained by stress concentration theory. The microscopic internal stress combined with space-charge theory was used to explain the variation of the remnant polarization with the pore structure.

Key words: porous PZT95/5 ceramics, ferroelectric properties, stress concentration, mechanical properties

CLC Number:

TM221

ZENG Tao, BAI Yang, SHEN Xi-Xun, WANG Bao-Feng, DONG Xian-Lin, ZHOU Zhi-Yong. Investigation on the Mechanical and Ferroelectric Properties of the Porous PZT 95/5 Ceramics[J]. Journal of Inorganic Materials, 2014, 29(7): 758-762.

Figures/Tables 8

Fig. 1 XRD patterns of the PZT95/5 ceramics with different pore formers

Fig. 2 SEM images of the porous PZT95/5 ceramics with (a) irregular pores and (b) spherical pores and (c) magnified microstructure of spherical pore

Fig. 3 Porosity of the porous PZT95/5 ceramics as a function of the content of pore formers

Fig. 4 Acoustic impedance of the porous PZT95/5 ceramics as a function of porosity

Fig. 5 Yield stress of the porous PZT95/5 ceramics as a function of porosity

Fig. 6 Stress concentration model in porous material (a) and schematic stress line distribution of the surfaced and internal pores along the line X-X’ in the porous PZT95/5 ceramics (b)

Fig. 7 Ferroelectric hysteresis loops of the porous PZT95/5 ceramics with different porosities (a) Dense PZT95/5 ceramic, Porosity = 4.1%, Ec = 1138 V/mm; (b) Porosity = 7.2%, Ec = 1197.5 V/mm; (c) Porosity = 10.2%, Ec = 1301.5 V/mm;(d) Porosity = 13.5%, Ec = 1863.6 V/mm

Fig. 8 Remnant polarization of the porous PZT95/5 ceramics as a function of porosity

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