Preparation and Properties of La-Doped BiFeO₃ Thin Films

Abstract

Bi1-xLaxFeO3(x=0, 0.3) thin films were deposited on glass/ITO substrates through Sol-Gel Dip-Coating method and rapid annealing process. The structures were detected by X-ray diffraction patterns, Raman spectrometer and scanning electron microscopy. The magnetic, ferroelectric and optical properties of the films were studied by vibrating sample magnetometer, ferroelectric integrate tester and photovoltaic performance testing system, respectively. The experimental results indicate that BiFeO3 thin film presents rhombohedral perovskite structure and Bi0.7La0.3FeO3 films showed distorted perovskite structure, which were confirmed by XRD patterns and Raman spectrometer. The magnetism and ferroelectric properties of the films were obviously enhanced by La doping. Furthermore, the photocurrent response and photovltaic effect in BLFO thin films were detected.

Synthesis, Characterization, and Photocatalytic Activity of Ba-Doped BiFeO3 Thin Films

“…In order to overcome the problems and limitations regarding the obtaining of BiFeO 3 powder system, a strategy was adopted of using various dopants substitution on Bi sites as Ca, Sr, Ba, Nd, Sm, La [22][23][24][25]. In the present case, Ba 2+ ion as dopant in BFO was chosen, as its ionic radius (1.35 Å) is higher than that of Bi 3+ ion (1.03 Å) and can compensate the Fe-O-Fe exchanges.…”

Láminas delgadas de materiales multiferroicos basados en BiFeO3 procesadas en medio acuoso

“…El equilibrio está gobernado por varias fuerzas; la resistencia viscosa y las fuerzas gravitatorias desempeñan el papel más importante, pero también juegan un papel relevante fuerzas como la tensión superficial, la fuerza de inercia o la presión[186]. Una competencia entre estas fuerzas en la región de deposición de la lámina gobierna su espesor[177].Como ejemplo, Hu et al[187] prepararon láminas de BiFeO 3 y de BiFeO 3 dopado con un 30% de La 3+ mediante sol-gel+dip-coating sobre sustratos de ITO (formado por óxido de indio y estaño). Observaron una estructura de tipo perovskita romboédrica en la muestra sin dopar y una estructura distorsionada en la muestra dopada.…”