Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 9, Pages 1533-1541Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm303743h
Keywords
BiFeO3; nanostructural domains; multiferroics
Funding
- CICYT MAT [2010-16614, CSD2009-00013, MAT-27470-C02-02]
- Spanish Ministry of Education [AP2008-00053]
- Spanish National Research Council (CSIC)
- European Science Foundation (ESF)
- Ramon y Cajal Program of MINECO
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Ti-doped BiFeO3 ceramics prepared by a mixed-oxide route were structurally characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM), giving evidence of the formation of an inner structure at the nanometric scale. The observed nanograins are separated by Ti-rich areas that originate due to the tendency of the titanium dopant to segregate from the perovskite lattice. Such a peculiar nanostructure is responsible for the changes produced in both the electrical and the magnetic properties of BiFeO3 upon titanium doping: the Ti-rich interfaces act as resistive layers that increase the direct-current (dc) resistivity of the material, while the existence of structural domains in the scale of tens of nanometers causes a ferrimagnetic-like behavior with a huge coercive field (on the order of 20 kOe), even at room temperature.
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