纳米晶NiZn铁氧体的结构

利用聚乙烯醇（ＰＶＡ）溶胶－凝胶法成功制备了Ｎｉ１－ｘＺｎｘＦｅ２Ｏ４纳米颗粒，通过改变实验条件可控制颗粒尺寸大小。扫描电镜观察到细小均匀颗粒。Ｘ射线衍射结果表明，随热处理温度的升高，颗粒尺寸增大；和大块材料相比，ＮｉＺｎ铁氧体纳米颗粒的单胞体积有所膨胀，穆斯堡尔研究发现，随纳米颗粒尺寸的增大，铁磁相成分增加。

Structure of Nanosized NiZn Ferrites

In the present investigation, we have succeed in preparing nanosized spinel Ni-Zn ferrites using PVA sol-gel method. It has been found that the average grain size increases with increasing heat-treatment temperature. The ultrafine partcles were observed by scanning electron micrograph(SEM). X-ray diffraction (XRD) analysis shows that the lattice parameter of nanosized Ni-Zn ferrites is larger than that of the bulk material. Mossbauer spectra of the samples at room temperature show that the portion of the ferromagnetic phase increases with increasing heat-treatment temperature.