Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of internal Stress on the Strength of PZT Cermics

PZT 세라믹스의 강도에 미치는 내부응력의 영향

  • Published : 1996.01.01
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Abstract

The aim of this study is to investigate the change of bending strength and fatigue strength in the unpoled and poled Pb(Zr, Ti)O3 ferroelectrics of tetragonal morphotropic phase boundary (MPM) and rhombohedral com-position in terms of internal stress which is measured by XRD method. Before poling treatment the highest bending strength was found in rhombohedral composition. After poling treatment the bending strength decreas-ed in all compositions but it decreased most remarkably in tetragonal composition. The most prominent de-crease of bending strength after poling treatment in tetragonal was attributed to the occurrence of microcracks due to highanisotropic internal stress around grain boundary which was induced of bending strength after poling in MPB and rhombohedral composition was not due to the occurrence of microcracks but to the increase in tensile internal stress perpendicular to the direction of crack propagation by domain alignment. Fatigue strength was higher before poling treatment than after poling treatment for various compositions.

Keywords

References

  1. Piezoelectric Ceramics B. Jafte;W.R. Cook;H. Jalfe
  2. J. Appl. Phys. v.31 no.1 Variation in Ferroelectric Characteristics of Lead Zirconate Titanate Due to Minor Chemical Modification R. Gersn
  3. Ferroelectrics v.41 Effects of Impurity Doping in Lead Zirconate-Titanate Ceramics S. Takahashi
  4. J. Am. Ceram. Soc. v.59 no.1-2 Effect of Internal Stress on the Strength of BaTiO₃ R.C. Pohanka;R.W. Rice;B.E. Walker JR
  5. Ferroelectrics v.88 Anisotropy of Internal Stress in Poled PZT Ceramics F. Kroupa;K. Nejezchleb;I. Saxl
  6. J. Am. Ceram. Soc. v.77 no.1 Electric Fatigue in Lead Zirconate Titanate Ceramics Q. Jiang;W. Cao;L.E. Cross
  7. J. Am. Ceram. Soc. v.77 no.7 Electric-Field-Induced Fatigue Crack Growth in Piezoelectrics H. Cao;A. G. Evans
  8. Kor. J. Mater. Res. v.3 no.5 Change in the Fracture Toughness of Pb(Zr.Ti)O₃Ceramics before and after Poling-Treatment W.P. Tai;S.H. Kim
  9. Elements of X-ray Diffraction B.D. Cullity
  10. Residual Stress Measurements by Diffraction and Interpretation I.C. Noyan;J.B. Cohen
  11. J. Am. Ceram. Soc. v.73 no.1 Effect of Grain Size and Poling on the Fracture Mode of Lead Zirconate Titanate Ceramics S.B. Kim;D.Y. Kim;J.J.Kim;S.H. Cho
  12. Ferroelectrics v.28 Fracture Processes Ferroic Materials R.C. Pohanka;S.W. Freiman;R.W. Rice
  13. J. Am. Ceram. Soc. v.73 no.3 Fracture Mechanism in Ferrolectric-Ferroelastic Lead Zirconate Titavate(Zr : Ti=0.54 : 0.46) Ceramics K. Mehta;A.V. Virkar