摘要
The microstructures of 7.9/70/30 (Pb92.1La7.9)(Zr70Ti30)O3 (PLZT) transparent ferroelectric ceramics are studied by using the high-resolution electron microscopy (HREM) techniques and electron diffraction. The results indicate that the structure of micro-domains presented in the cubic a-phase is exactly the same as that of its ferroelectric β-phase after poling. The fringe-shape micro-regions, appearing in the HREM microphotograph of 7.9/70/30 PLZT, are the result from lattice-overlapping of the orthorhomhic micro-domains and the cubic a-phase matrix. Furthermore, a 2×d111 superlattice along the <111>-direction has been observed in 7.9/70/30 PLZT ceramics. This is probably the result of gliding or rotation on the (111)-plane of self-structure regulation due to point defects.
The microstructures of 7.9/70/30 (Pb92.1La7.9)(Zr70Ti30)O3 (PLZT) transparent ferroelectric ceramics are studied by using the high-resolution electron microscopy (HREM) techniques and electron diffraction. The results indicate that the structure of micro-domains presented in the cubic a-phase is exactly the same as that of its ferroelectric β-phase after poling. The fringe-shape micro-regions, appearing in the HREM microphotograph of 7.9/70/30 PLZT, are the result from lattice-overlapping of the orthorhomhic micro-domains and the cubic a-phase matrix. Furthermore, a 2×d111 superlattice along the <111>-direction has been observed in 7.9/70/30 PLZT ceramics. This is probably the result of gliding or rotation on the (111)-plane of self-structure regulation due to point defects.
