Investigation on switching behaviour of 90° ferroelectric domains in (Pb0.85Sm0.10) (Ti0.98Mn0.02)O3 piezoelectric ceramics of ultra-high electromechanical anisotropy by the X-ray diffraction technique
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An investigation on Sm modified PbTiO3 ceramics of typical ultra-high electromechanical anisotropy was carried out by means of X-ray diffraction (XRD) technique. By introduction of crystal plane orientation density ρ(hkl), a good description of switching behaviour of 90° ferroelectric domains within the ceramic discs poled at different electric forces has been achieved. The results indicate that 90° domains show a strong spatial orientation preference so that most of the 90° walls are oriented with their normal vectors enclosing an angle 45° with the specimen surface. After poling treatment few changes occurred in the 90° wall distribution but noticeable domain wall shifts occurred. Another noteworthy result is that the thickness electromechanical coupling coefficient Kt develops with poling field almost at the same pace as the orientation density gain Δρ (002) of (002) crystal plane does. The implications of their mutual linkage are outlined.
KeywordsDomain Wall Crystal Plane Poling Field Electromechanical Coupling Piezoelectric Ceramic
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