Structure and electromagnetic properties of LBBS glass added M-type Sr ferrites for LTCC technology

Sr ferrites with x wt% Li 2 O–B 2 O 3 –Bi 2 O 3 –SiO 2 glass ( x for 0–2 wt%) calcined at 850 °C and 1150 °C were synthesized by the traditional solid phase method of ceramics. The main phase of the sintered samples was standard Sr ferrite structure. The XRD results showed that the addition of LBBS glass enhances the peak of Sr ferrites and weakens the peak of Fe 2 O 3 , combined with SEM images, LBBS glass has a significant effect on reducing the sintering temperature. At low temperature (850 °C), the coercivity, saturation magnetization and residual magnetization of the samples all show an increasing trend. This is mainly attributed to the increase of M phase, the increase of densification, the more complete grain growth and the decrease of Fe 2 O 3 in liquid phase sintering (LBBS glass after melting). At the same time, part of the electromagnetic properties of the samples also improved at high temperature (at 1150 °C). Among them, the Sr ferrites sintering at 850 °C with 1.2 wt% LBBS glass achieving excellent magnetic properties, including M s = 41.25 emu/g, reach the standard of 96.08%; H cj = 3423.8Oe, reach the standard of 134.48%; M r = 25.12 emu/g, reach the standard of 101.57%, the sample of x = 0.0 sintering 1150 °C as the standard sample.