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利用X光衍射和透射电子显微技术,对粒子Fe3O4-SrFe12O19的复合机理进行了研究.弄清了尖晶石型外延包裹层的生长机理.证实了外延层和内核粒子通过电子交换产生了很强的耦合作用.经过改性之后,尖晶石型晶体层在SiFe12O19粒子表面得到良好的生长.Using XRD and TEM techniques, the modification mechanism of Fe3O4-SrFe12O19 particles has been studied. We have also studied the growth mechanism of spinel phase coating overlayer, and demonstrated that there exists a strong exchange coupling between coating overleyer and core particles due to the complexation of Fe2+ ions in suspension and Fe3+ ions extracted from the core particles. After modification, crystal structure and magnetic properties of SiFe12O19 particles were modified.
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