Core?shell microstructures in 0.68Pb(Fe2/3W1/3)O3?0.32PbTiO3 at the morphotropic phase boundary
作者： Zhenrong Li , Aiying Wu , P M Vilarinho , Ian M Reaney
DOI: 10.1088/0953-8984/17/13/014
关键词: Core (optical fiber) 、 Shell (structure) 、 Dielectric 、 Transmission electron microscopy 、 Condensed matter physics 、 Crystallography 、 Microstructure 、 Materials science 、 Phase boundary 、 Titanate 、 Domain wall (magnetism)
摘要: The domain structures of ceramics with the morphotropic phase boundary (MPB) composition 0.68PFW?0.32PT were analysed in?situ by TEM as a function temperature from 16 to 300?K. A core?shell structure was detected at room temperature, in which core grains Ti rich and shell W respect bulk composition. At 16?K, macrodomain state is observed throughout volume grains, but >250?K domain-free formed around central that still exhibits strong wall strain contrast two-beam conditions. presence microstructure growth on cooling correlated appearance (h00)/(00l) peak splitting XRD traces decreases used interpret dielectric data.
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