【摘要】 利用溶胶-凝胶法分别在Pt/TiO₂/SiO₂/Si和ITO/玻璃衬底上制备纯相的铁酸铋（Bi Fe O3）和La掺杂的铁酸铋（Bi1-xLaxFe O3,x=0. 05,0. 1）薄膜。XRD测试表明BLFO薄膜为纯钙钛矿相,都呈（111）方向的菱形结构,La掺杂可以提高BFO薄膜的结构稳定性。镧掺杂铁酸铋具有更大的剩余极化值和较小的漏电流。此外,随着La成分的增加,薄膜的基本吸收边呈现红移,并通过Tauc公式计算拟合观察到BLFO的光学带隙逐渐减小。结果发现随着La掺杂量（0,5mol%,10mol%）逐渐增大,薄膜的剩余极化值越大,其禁带宽度（Eg）越小。更多还原

【Abstract】 Bi_1-xLa_xFeO₃（ x = 0,0. 05,1） films were deposited on ITO/glass and Pt/Ti/SiO₂/Si substrates by Sol-gel technique. XRD measurements show that BLFO films are of a（ 111） oriented rhombic perovskite structure and the introduction of La can further improve the structural stability of the BFO films. Lanthanum doped bismuth ferrite presents a larger residual polarization value but a smaller leakage current. Moreover,with the increasing of the content of La3 +,the fundamental absorption edges of BLFO films exhibit red shift and the optical bandgaps of BLFO decreases gradually by calculating and fitting with Tauc formula. The results indicate that as the La doping increases（ 0,5 mol%,10 mol%） larger the residual polarization,the smaller the band gap Eg.更多还原