Effects of Sm/Gd-Nd Co-Substituting on the Properties of High Dielectric Constant Microwave Garnet Ferrites
Garnet ferrites with high dielectric constant and high power were synthesized by a solid phase process.The high dielectric constant and high power characteristics were integrated by co-substituting Y3+ with Gd3+-Nd3+,Sm3+-Nd3+ and Bi3+ in regular garnet ferrites.The electromagnetic properties of ferrites prepared at different temperatures were investigated.Crystal structure and micro morphology of ferrites were characterized by X-ray diffractometer and scanning electron microscope,and all ferrites were pure garnet phase.High permittivity and high power were integrated well in ferrites in this work,and other properties were also excellent,such as tanδ<2×10-4 and Tc>260℃.Two kinds of ferrites show different sintering features.Sm-Nd co-substituted ferrites were overburnt at 1090℃and 1100℃,and the electromagnetic properties deteriorated.However,the electromagnetic properties of Gd-Nd co-substituted ferrites were stable at all sintering temperatures.
High permittivityHigh powerGarnet ferriteElectromagnetic propertySintering temperature
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