Effect of boron substitution on the properties of NiZnCu ferrite for multilayer chip inductors

The initial permeability of the toroidal core sample with boron substituted NiZnCu ferrite (Ni(0.36)Zn(0.44)Cu(2.2)Fe(1.96-x)B(x)O(4) (X = 0.0, 0.2, 0.4, 0.6, and 0.8)) which was annealed at 900 degrees C for 2 h decreased from 162.4 to 123.2 as boron concentration x is increased from 0.2 to 0.8. The quality factor and density of 0.2 mol% boron substituted NiZnCu ferrites sintered at 900 degrees C for 2 h was about 240.0 and 4.84 g/cm(3), respectively. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature. It was shown that the boron substituted NiZnCu ferrite systems were promising as a high quality factor material in the fabrication of multilayer chip inductors (MLCIs). (C) 2011 Elsevier B.V. All rights reserved.