resumo
Lead-free piezoelectrics are becoming increasingly important in view of environmental problems of currently used lead-based perovskites such as lead zirconate titanate (PZT). One of the recent candidates for PZT replacement, solid solutions of BaZr0.2Ti0.8O3 and Ba0.7Ca0.3TiO3, are investigated in this work by piezoresponse force microscopy. Coexistence of the tetragonal and rhombohedral phases in this material is observed, which probably gives rise to easy polarization switching due to multiple domain states. The period of observed domain lamella scales with the grain size obeying well-known square root dependence characteristic of BaTiO3 ceramics. Domain switching and relaxation are investigated at the nanoscale as a function of the applied voltage and duration of the applied voltage pulses. The observed distortion of piezoresponse hysteresis loops near grain boundaries is attested to the increased concentration of defects. Nanoscale piezoelectric properties of these materials are discussed. (C) 2015 AIP Publishing LLC.
palavras-chave
SCANNING FORCE MICROSCOPY; FERROELECTRIC MATERIALS; POLARIZATION REVERSAL; CERAMICS; FILMS; TEMPERATURE; BIFEO3; WALLS; PHASE; SIZE
categoria
Physics
autores
Turygin, AP; Neradovskiy, MM; Naumova, NA; Zayats, DV; Coondoo, I; Kholkin, AL; Shur, VY
nossos autores
Andrei Kholkin
Investigador Principal
Indrani Coondoo
Investigador JúniorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
The equipment of Ural Center for Shared Use