info:eu-repo/semantics/conferenceProceedings
Study of Electronic Structure of LiNbO3 Nanoparticles by EELS
Autor
VERONICA GALLEGOS OROZCO
AUDEL SANTOS BELTRAN
FRANCISCO PARAGUAY DELGADO
CARLOS ALEJANDRO DIAZ MORENO
JOSE RURIK FARIAS MANCILLA
FRANCISCO ESPINOSA MAGAÑA
Institución
Resumen
Lithium Niobate (LN) is one of the most intensively and exploited materials in fundamental and applied
optics. Lithium Niobate is a ferroelectric material that exhibits spontaneous electric polarization that can
be switched to its symmetry equivalent states with applied electric field. It is known that ferroelectricity is
suppressed at the nano-scale, due to depolarization fields arising from the bound charges at the surface.
For example, ferroelectricity in BaTiO3 nanoparticles disappears below a critical size (40 nm). On the
other hand, recent works have shown that ferromagnetism occurs in nanoparticles of the otherwise
non-magnetic oxides, but decreases with increasing particle size. Magnetism in these nanoparticles,
considered to arise from vacancies at the surface, is suggested to be a universal phenomenon. A recent
finding of ferroelectricity in much smaller (12 nm) nanoparticles of BaTiO3 motivated us to explore the
simultaneous occurrence of ferromagnetism and ferroelectricity in nanocrystalline LiNbO3. The dielectric
properties of nanostructured LiNbO3 are studied by analyzing the low-loss region of the electron energy
loss spectroscopy (EELS) in a transmission electron microscope.
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