Ferroelectric-to-relaxor transition behaviour of BaTiO3 ceramics doped with La(Mg1/2Ti1/2)O-3
authors Salak, AN; Shvartsman, VV; Seabra, MP; Kholkin, AL; Ferreira, M
nationality International
journal JOURNAL OF PHYSICS-CONDENSED MATTER
keywords DIFFUSED-PHASE-TRANSITION; LEAD-FREE; DIELECTRIC-PROPERTIES; BARIUM-TITANATE; DIFFRACTION; PEROVSKITES; SITE
abstract Low-frequency dielectric studies were performed on the fine-grain ceramics of BaTiO3 doped with 2.5 mol% of non-ferroelectric perovskite La(Mg1/2Ti1/2)O-3 (BT:2.5% LMT). In addition to the permittivity and P-E hysteresis loop measurements as a function of temperature, local electromechanical properties of BT:2.5% LMT were analysed by piezoresponse force microscopy. It was found that the temperature evolution of the dielectric properties detected by macroscopic methods (average over many grains) is similar to that observed on the nanoscale level (in a single grain). BT:2.5% LMT was revealed to exhibit the typical features of both the ferroelectric and the relaxor. The observed dielectric behaviour is discussed in terms of heterovalent substitution at both A-(Ba2+/La3+) and B-(Ti4+/Mg2+) perovskite sites.
publisher IOP PUBLISHING LTD
issn 0953-8984
year published 2004
volume 16
issue 16
beginning page 2785
ending page 2794
digital object identifier (doi) 10.1088/0953-8984/16/16/003
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000221482900009
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