Dielectric and magnetic properties of 0.4PZT+0.6NiCuZn-ferrite composites modified with P2O5–Co2O3

• Published in: Journal of applied physics 2010-05, Vol.107 (9)
• Main Authors: Jia, Lijun, Zhang, Huaiwu, Li, Tao, Liu, Yingli, Wen, Qiye, Shen, Jian
• Format: Article
• Language: English
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.3360197

P 2 O 5 and Co2O3 have been introduced to 0.4PZT+0.6NiCuZn-ferrite composites in order to improve their electromagnetic properties, particularly for the suppression of electromagnetic interference. The nonlinear fitting of the results of permeability dispersion has revealed the relationships between domain wall resonance, spin rotation relaxation mechanisms, microstructure, and local induced anisotropy. The P2O5 additive can enhance the bulk density and static permeability due to its instantaneous liquid phase at low temperature. The existence of local induced anisotropy caused by ordering of Co ions results in a decrease in static permeability and an increase in the Q-factor. Meanwhile, the addition of Co2O3 can improve the dielectric constant and the loss tangent (tan δe) by increasing the oxygen vacancy concentration. The further decrease in tan δe of the samples codoped with P2O5 and Co2O3 is mainly attributed to P5+ in the grain boundary which can increase cation vacancies in the grain boundary region.