Ferroelectric Properties and Magnetoelectric Effect in (1−x)Ni_0.93Co_0.02Cu_0.05Fe₂O₄/xPZT Particulate Composites

Abstract

A series of (1-x)Ni_0.93Co_0.02Cu_0.05Fe₂O₄/xPZT (NCCF/PZT) particulate composites have been prepared by the high energy ball milling and normal ceramic sintering techniques. The constituent phases of the composites and the grain sizes were investigated by X-ray diffraction (XRD). The frequency spectrum of relative dielectric constant (ϵ_r ) was analyzed in the range of 40 Hz to 1 MHz at room temperature. The temperature dependence of ϵ_r was studied at three frequencies (1 kHz, 10 kHz, 100 kHz). It is experimentally found that ϵ_r and piezoelectric constant (d ₃₃) get bigger when the x increases, and the Curie temperature decreases with increasing ferrite content. The dielectric constant is stable at higher frequencies. The electric hysteresis loops show weak ferroelectric property. The magnetoelectric (ME) coefficient was studied at various frequencies and the maximum ME voltage coefficient was 56.17 mv/mc.Oe for 0.8PZT+0.2NCCF composite ceramic.

Keywords:

• Energy ball-milling
• dielectric
• ferroelectric
• magnetoelectric
• composites

Acknowledgments

This work was financially supported by the Ministry of Sciences and Technology of China through 973-project (Grant NO. 2009CB623306) and National Natural Science Foundation of China—NSAF (Grant No: 10976022).