XRD Study on D-Values of Modified PbTiO3 Ceramics during Poling Process
The Calcium modified PbTiO3 ceramics with large piezoelectric anisotropy was poled in consecutive steps. X-ray diffraction (XRD) found that the values of inter-planar spacing, d002 and d200, increased with poling field at initial poling stages. A noticeable drop of the d¬002 and d200 at the coercive field was observed. The residual stresses measured by the angle tilt method were introduced. The relations of d002-sin2ψ and d¬¬200-sin2ψ at different poling stages were simulated by a mathematic model. The linear terms in the model are related to the macro-stress which may cause an elastic deformation; the exponential term in the model is related to the micro-stress which may cause a plastic deformation by the 90o domain switch. The results show that macro-stress and micro-stress decreased and the decay speed along angle increased as to the d002 lattice spacing. The residual stresses related to the d200 lattice spacing were almost not changed.
Yiwang Bao, Li Tian and Jianghong Gong
Y. W. Zhang et al., "XRD Study on D-Values of Modified PbTiO3 Ceramics during Poling Process", Advanced Materials Research, Vol. 177, pp. 37-40, 2011