Polarization relaxation mechanism of Ba_(0.6)Sr_(0.4)TiO_3/Ni_(0.8)Zn_(0.2)Fe_2O_4 composite with giant dielectric constant and high permeability

摘要

Ba_(0.6)Sr_(0.4)TiO_3/Ni_(0.8)Zn_(0.2)Fe_2O_4 (BST/NZO) composites were synthesized via the conventional solid-state reaction method. The phase composition and surface morphology of the composites were investigated using x-ray diffractometry and scanning electron microscope, respectively. The dielectric and magnetic properties of the composites were studied. The results show that the BST/ NZO composites have giant dielectric constants and very high permeabilities. For the 10%BST/ 90%NZO composite, the dielectric constant and permeability in low frequency range are about 150 000 and 29, respectively. The giant dielectric behavior of the BST/NZO composites is mainly attributed to the Maxwell-Wagner polarization.