Gd3+、Co3+共掺杂铁酸铋薄膜多铁性增强及带隙调谐

摘要/Abstract

摘要： 多铁功能材料在现代生产生活中有举足轻重的作用。本文采用溶胶-凝胶法以硝酸铁、硝酸铋、硝酸钆、硝酸钴为原料,乙二醇甲醚为溶剂,柠檬酸作螯合剂制成前驱体溶液,通过旋涂法在Pt/Ti/SiO₂/Si及ITO衬底上合成Bi_0.85Gd_0.15Fe_1-xCo_xO₃ (x=0, 0.04, 0.08, 0.12)薄膜,研究了Gd³⁺、Co³⁺共掺杂对薄膜铁电性能、磁学性能及光学带隙的影响。XRD结果表明所有薄膜均呈(111)方向的菱形结构,SEM结果表明共掺杂可以细化晶粒。根据铁电性和漏电流测试分析结果可知在Co³⁺掺杂量为8%时最大剩余极化值达到2P_r=15.71 μC/cm²,所有样品的漏电流传导机制均为欧姆传导机制。根据磁学性能测试分析结果可知,共掺杂可以有效增强薄膜的饱和磁化强度,且在Co³⁺掺杂量为8%时最大饱和磁化强度达到37.78 emu/cm³。根据吸收光谱及Tauc公式拟合结果可知共掺杂可以有效减小薄膜的光学带隙且随着掺杂量的增加光学带隙逐渐减小,在Co³⁺掺杂量为12%时光学带隙减小到1.96 eV。

关键词: 溶胶凝胶, 铁酸铋, 铁电性能, 铁磁性能, 漏电流, 光学带隙

Abstract: Multiferroic functional materials are of significant importance in modern daily life and industry. Here we report a multiferroic functional material Bi_0.85Gd_0.15Fe_1-x Co_xO₃(x=0, 0.04, 0.08, 0.12) thin film which was synthesized on Pt/Ti/SiO₂/Si and ITO substrates by sol-gel process, involving ferroic nitrate, bismuth nitrate, gadolinium nitrate, cobalt nitrate as raw materials, ethylene glycol methyl ether as solvent, and citric acid as chelating agent forming precursor solution. A comprehensive investigation of structure, ferroelectric property, magnetic property and optical band gap of Gd³⁺ and Co³⁺co-doping BiFeO₃ was conducted. XRD results reveal that all films showing a rhombohedral structure in the (111) direction, and SEM results exhibit that co-doping could refine the grains. According to the results of ferroelectricity and leakage current test analysis, the maximum residual polarization value reaches 2P_r =15.71 μC/cm² when the Co³⁺ doping amount is 8%, at which amount also achieves the maximum saturation magnetization 37.78 emu/cm³. The leakage current conduction mechanism of all samples is ohmic conduction mechanism. Last but not least, a modulated bandgap effect according to the absorption spectrum and the fitting results of the Tauc formula were observed. In the co-doping film, the optical bandgap gradually decreases with the increase of the doping amount. In particular, when the Co³⁺doping amount is 12%, the optical bandgap decreases to 1.96 eV.

Key words: sol-gel, bismuth ferrite, ferroelectric property, ferromagnetic property, leakage current, optical bandgap

中图分类号:

O484.4

马国斌, 杨松, 徐蕾, 郭凯鑫, 王旭. Gd³⁺、Co³⁺共掺杂铁酸铋薄膜多铁性增强及带隙调谐[J]. 人工晶体学报, 2021, 50(5): 851-857.

MA Guobin, YANG Song, XU Lei, GUO Kaixin, WANG Xu. Multiferroic Enhancement and Bandgap Tuning of Gd³⁺ and Co³⁺ Co-Doped Bismuth Ferrite Thin Films[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 851-857.

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Gd³⁺、Co³⁺共掺杂铁酸铋薄膜多铁性增强及带隙调谐

Multiferroic Enhancement and Bandgap Tuning of Gd³⁺ and Co³⁺ Co-Doped Bismuth Ferrite Thin Films

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