中文摘要：

以Bi（NO3）3.5H2O,Fe（NO3）3.9H2O为原料,柠檬酸为螯合剂,用液相自组装法,在ITO玻璃基片上制备了纯相BiFeO3薄膜。研究了前驱液中Fe3＋/Bi 3＋摩尔比对BiFeO3薄膜的影响。利用XRD,EDS,XPS,FE-SEM和FT-IR等测试手段对BiFeO3薄膜进行了表征。结果表明,由于柠檬酸对Fe3＋的掩蔽作用,使得Bi 3＋络合物比Fe3＋络合物沉积速率大,导致薄膜出现Bi2O3和Bi2O2.33相,随着Fe3＋/Bi 3＋摩尔比增加到2.6时,制备了纯相BiFeO3薄膜;薄膜表面平整致密,颗粒均匀,生长完好,薄膜厚度约为275nm;BiFeO3薄膜中Fe原子的氧化态是Fe3＋;Bi 3＋和Fe3＋的络合物以不同的速率被—OH诱导吸附到ITO玻璃基片上,形成牢固的化学键结合,退火处理后形成晶态BiFeO3薄膜。

英文摘要：

Pure phase BiFeO3 films were successfully prepared on ITO/glass substrates by liquid phase self-assembled method using Bi（NO3）3·5H2O,Fe（NO3）3·9H2O as raw materials and citrate acid as chelating agent.The influence of Fe3＋/Bi3＋ molar ratio on the preparation of BiFeO3 films was studied.The BiFeO3 films were characterized by XRD,EDS,XPS,FE-SEM and FT-IR.The results indicated that：the covering effect of citrate acid to Fe3＋ is responsible for the larger deposition rates of the chelates of Bi3＋,which made the Bi2O3 and Bi2O2.33 phase could be observed,and the pure phase BiFeO3 films are obtained when the Fe3＋/Bi3＋ molar ratio was added to 2.6;the films are dense,smooth,grown well,the thickness of the pure phase BFO thin film is approximately 275 nm;the oxidation state of Fe atom is Fe3＋ in the films;the chelates of Bi3＋ and Fe3＋ are induced and adsorbed onto the ITO/glass substrates with different rates through the —OH,which form strong chemical bonding,the crystalline BiFeO3 films are obtained after annealing process.