Core-shell microstructures in 0.68Pb(Fe2/3W1/3)O-3-0.32PbTiO(3) at the morphotropic phase boundary
authors Li, ZR; Wu, AY; Vilarinho, PM; Reaney, IM
nationality International
journal JOURNAL OF PHYSICS-CONDENSED MATTER
keywords PBFE2/3W1/3O3-PBTIO3 SOLID-SOLUTIONS; LEAD-ZIRCONATE-TITANATE; PB(FE2/3W1/3)O-3-PBTIO3 SYSTEM; CERAMICS; RELAXOR; COEXISTENCE; DIELECTRICS; TRANSITION
abstract 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 of temperature from 16 to 300 K. A core-shell structure was detected at room temperature, in which the core of the grains was Ti rich and the shell W rich with respect to the bulk composition. At 16 K, a macrodomain state is observed throughout the volume of the grains, but at > 250 K a domain-free shell is formed around a central core that still exhibits strong domain wall strain contrast in two-beam conditions. The presence of the core-shell microstructure and the growth of the core on cooling is correlated with the appearance of (h00)/(00l) peak splitting in XRD traces as temperature decreases and is used to interpret the dielectric data.
publisher IOP PUBLISHING LTD
issn 0953-8984
year published 2005
volume 17
issue 13
beginning page 2167
ending page 2175
digital object identifier (doi) 10.1088/0953-8984/17/13/014
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000228579400016
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