Domain structure-dielectric property relationship in lead-free (1−x)(Bi1/2Na1/2)TiO3xBaTiO3 ceramics
作者： C. Ma , X. Tan , E. Dul'kin , M. Roth
DOI: 10.1063/1.3514093
关键词: Crystal structure 、 Dielectric 、 Crystallography 、 Permittivity 、 Phase diagram 、 Superlattice 、 Lamellar structure 、 Materials science 、 Ferroelectricity 、 Phase boundary
摘要: The domain morphology and crystal structure of (1−x)(Bi1/2Na1/2)TiO3xBaTiO3 lead-free piezoelectric ceramics were systematically studied with transmission electron microscopy for compositions x=0.04 through 0.11. It was found that the x<0.06 display a R3c symmetry ferroelectric domains ∼100 nm forming complex structures at room temperature. Only nanodomains faint contrast observed in 0.07≤x≤0.09. presence weak 1/2 (ooe) superlattice diffraction spots absence (ooo) ones (o stands odd e even miller indices) seem to suggest P4bm morphotropic phase boundary composition x=0.06 showed mixed phases. Large lamellar P4mm dominate ceramic x=0.11. correlates extremely well frequency dispersion dielectric constant temperature new concept “relaxor antifer...
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