Department for Materials Synthesis, Jožef Stefan Institute, Ljubljana, Slovenia.
Langmuir. 2011 Dec 6;27(23):14014-24. doi: 10.1021/la2032863. Epub 2011 Nov 10.
We have studied the preparation of oriented BaFe(12)O(19) films produced using electrophoretic deposition (EPD). Highly anisotropic, platelike BaFe(12)O(19) particles were synthesized under hydrothermal conditions, and from these particles, stable suspensions were prepared in 1-butanol by the addition of dodecylbenzene sulfonic acid as a surfactant. The interplay of the interaction forces between the suspended particles and the forces acting on the particles during the EPD directed the particles' assembly in the plane of the substrate. The most significant effect on the orientation of the films was the diameter-to-thickness ratio of the particles, which was experimentally confirmed with X-ray analyses, electron microscopy, and magnetic measurements. The abnormal grain growth that accompanied the sintering at 1150 °C further improved the overall orientation of the films, which showed highly anisotropic magnetic behavior with a remanent-to-saturation magnetization ratio exceeding 0.8.
我们研究了使用电泳沉积（EPD）制备取向钡铁氧体（BaFe(12)O(19)）薄膜的方法。在水热条件下合成了具有各向异性的片状钡铁氧体（BaFe(12)O(19)）颗粒，通过添加十二烷基苯磺酸作为表面活性剂，在 1-丁醇中制备了稳定的悬浮液。悬浮颗粒之间的相互作用力与 EPD 过程中颗粒上的力之间的相互作用，引导颗粒在基底平面上组装。对薄膜取向影响最大的是颗粒的直径与厚度比，这一点通过 X 射线分析、电子显微镜和磁测量实验得到了证实。在 1150°C 烧结时伴随的异常晶粒生长进一步提高了薄膜的整体取向，其表现出具有剩磁与饱和磁化强度比超过 0.8 的各向异性磁性能。
