Influence of Replacement of B2O3 by SiO2 on the Structure and Magnetic Properties of BaO-Fe2O3-SiO2-B2O3-CeO2 Glass-Ceramics

In this study, a series of magnetic glass-ceramics with the composition of 20BaO-20Fe2O3-xSiO2- (60 − x)B2O3-1CeO2 (x = 0−50, in weight percent) were prepared by conventional melt casting followed by heat treatment method. The crystalline phases, structure, microstructure, and magnetic properties were investigated systematically with the gradual replacement of B2O3 by SiO2. The results indicated that there existed a “boron abnormal phenomenon” due to the variation of [BO3]/[BO4] in the glass-ceramics with xchange, which led to an abrupt transition in magnetic property. With x increasing from 20 to 30, a continuous transition from the paramagnetic to the ferromagnetic nature is observed, in which the values of Ms were enhanced greatly with increasing x. The values of Ms and Mr for the x = 50 sample were 10.930 and 3.527 emu/g, respectively.