resumo
BiFeO3-LaFeO3-CaTiO3 ceramics have been studied by X-ray diffraction, magnetization measurements, and piezoresponse force microscopy (PFM). The compositional ranges of the polar, antipolar, and non-polar phases have been estimated. PFM measurements testify gradual decrease of piezoelectric response in Bi(0.85-x)La(0.15)CaxFe(1-x)Ti(x)O(3) system with Ca/Ti content increase, except a narrow concentration region near polar-antipolar phase boundary where piezoelectric signal shows maximum value. It is found that increase of dopant concentration leads to apparent decrease of the off-center Bi-O displacement and, consequently, causes a reduction of piezoelectric response. It is concluded that notable remanent magnetization in polar and non-polar structural phases is a result of the Dzyaloshinsky-Moria interaction. (C) 2013 AIP Publishing LLC
palavras-chave
EARTH-SUBSTITUTED BIFEO3; PIEZOELECTRIC PROPERTIES; STRUCTURAL TRANSFORMATION; MULTIFERROIC CERAMICS; THIN-FILMS; TRANSITION; TITANATE; BEHAVIOR; LA; TI
categoria
Physics
autores
Karpinsky, DV; Troyanchuk, IO; Sikolenko, V; Efimov, V; Kholkin, AL
nossos autores
Andrei Kholkin
Investigador Principal
Dzmitry Karpinski (Karpinsky)
Bolseiro de pós-DoutoramentoProjectos
MULTIFOX: Nanometric Probing and Modification of Multiferroic Oxides (PTDC/FIS/105416/2008)
agradecimentos
The authors would like to acknowledge the financial support from the FCT (Grant No. SFRH/BPD/42506/2007, Project No. PTDC/FIS/105416/2008) and RFFI (Grant No. 12-02-90912). Dr. F. Figueiras, Dr. S. Das, Dr. F. Maxim, and Dr. R. Rai are acknowledged for the help with SEM and magnetization measurements.