掺杂稀土离子的BiY_2Fe_5O_(12)结构与磁性

Structure and Magnetic Properties of BiY_2Fe_5O_(12) Nanoparticles Doped with Gd^(3+) Ions

采用溶胶-凝胶法制备了GdxBiY2-xFe5O12(x=0,0.1,0.2,0.4,0.6,0.8)纳米晶粉体系列样品.利用DTA,TGA,XRD,TEM,IR和VSM等方法对材料的制备过程和产物进行分析.结果表明,Gd的掺入并未改变BiY2Fe5O12的石榴石结构.讨论了Gd离子掺入BiYIG铁氧体的粒径、形貌及磁性规律.

GdxBiY2-xFe5O12 （x =0,0. 1, 0. 2,0. 4,0. 6,0. 8 ） nanocrystals were synthesized v/a the sol-gel method. Samples were characterized by means of powder X-ray diffraction （XRD）, thermal gravity analysis （TGA） and differential thermal analysis （DTA）, transmission electron microscopy （TEM）, vibrating sample magnetometer （VSM）. The average sizes of the particles were determined by virtue of Scherrer＇s formula and were in a range of 43 -50 nm. The effect of Gd^3＋ substitution for Y^3＋ on magnetic properties of BiY2Fe5O12 was investigated.