Enhanced gyromagnetic properties of Cu-substituted LiZnTi ferrites for LTCC applications

In this work, we prepared a type of LiZnTiCu ferrite with a large grain size and enhanced magnetic properties at -900 degrees C by substituting Cu2+ ions and doping LBSCA glass. Rietveld refinement of XRD patterns indicates that the Fe3+ ions in B sites are partially replaced by the Cu2+ ions, which causes the monotone increase of lattice constant. SEM results show that the interaction of CuO nanoparticles and LBSCA glass causes two changes in the grain growth of the LiZnTiCu ferrites. The grain growth is suppressed when the amount of CuO nanoparticles is less than a threshold value (x = 0.05 for 900 degrees C; x = 0.20 for 875 degrees C). However, when enough CuO nanoparticles are added, the ferrites possess a large and compact microstructure. The variation of magnetic hysteresis (M-H) loops confirms that Ms follows the Ne ' el's collinear spinel model with the increasing number of CuO nanoparticles (x <= 0.25). Finally, a type of LiZnTiCu ferrite (x = 0.15) with uniform large grains (average size >10 mu m) and good magnetic parameters (4 pi Ms = 3457.59 G, Hc = 224.4 A/m and Bs = 236.4 mT) is obtained at -900 degrees C.

Automated summary

In this study, a type of LiZnTiCu ferrite with a large grain size and enhanced magnetic properties was successfully prepared by substituting Cu2+ ions and doping LBSCA glass. The interaction between CuO nanoparticles and LBSCA glass was found to affect the grain growth of the ferrites. The magnetic properties of the ferrites also changed with the increasing number of CuO nanoparticles.