Analogous study in low magnetic field between Cu-Ge and Cu-Si ferrites

Two series of mixed copper ferrites, Cu(1+x)Ge(x)Fe(2-2x)O(4) and Cu(1+x)Si(x)Fe(2-2x)O(4), have been analogously investigated for x=0.0,0.05,0.1,0.15,0.2,0.25 and 0.3. The two systems were prepared using the standard ceramic techniques. X-ray diffraction analysis indicates that both systems formed in a single phase cubic spinel structure. The lattice parameter has a constant value (0.838 nm +/- 0.001) for the two series. The grain diameter was estimated from the scanning electron microscope micrographs for the two series. Some magnetic properties were measured at room temperature. The magnetization M was measured in the range of magnetizing field upto 5500 Am(-1). The relative permeability (mu(r)) was calculated from the B-H relation. The B-H loops were measured at constant magnetizing current (I=2.5 A which is equivalent to 900 Am(-1)). Also, the hystersis area and the magnetic parameters B(r), B(s), mR (B(r)/B(s)) and apparent energy loss (E) were estimated from the B-H loops; mu(r), B(r), B(s) and E are composition dependent. (C) 2009 Elsevier B. V. All rights reserved.