Ferroelectric Domain Structures and their Morphology Evolution in Pb(Ni1/3Nb2/3)O3–PbZrO3–PbTiO3 Piezoelectric Ceramics Modified by Bismuth and Zinc Substitutions

摘要: Ferroelectric domain structures and their morphology evolution in the Bi- Zn-modified (Pb0.985Bi0.01)(Ni1/4Zn1/12Nb2/3)x(ZrσTi1−σ)1−xO3 piezoelectric ceramics (0.20≤x≤0.60 0.10≤σ≤0.60) are investigated as a function of relaxor Pb(Ni1/3Nb2/3)O3 content Zr/(Zr+Ti) ratio (σ) by transmission electron microscopy selected area diffraction, followed complete analysis nature walls based on predicated twinning planes for formation domains these ceramic systems. A systematic variation was observed compositions move from ferroelectric tetragonal (FT) to pseudocubic (Fpc) phases, then rhombohedral (FR) phase. Wedged-shaped with misoriented {110} mixed herringbone-like configuration main features FT Fpc whereas near morphotropic phase boundary (MPB) between FR characteristic feature is an intricate structure exhibiting fluctuating mottled contrast. However, boundaries exhibit wavy character. The at/near MPB phases high property coefficients 90° texture structure. different configurations due accommodations local elastic strain fields. soft behavior normal-relaxor transition this system closely related above increasing PNN or ratio.