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Studies of the dielectric and ferroelectric properties of PZT: NZF magnetoelectric composites
Chandra Prakash,J.K. Juneja,K.K. Raina,Chandra Prakash 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
Piezoelectric-magnetostrictive (magnetoelectric) composites using piezoelectric lead zirconate titanate (PZT) ceramic and magnetostrictive Ni-Zn ferrite (NZF) with compositional formulae (1-x) PbZr0.65Ti0.35O3-x Ni0.8Zn0.2Fe2O4 with x = 0 to 0.15 in steps of 0.05, were prepared by a conventional solid state route. The presence of individual phases was confirmed using X-ray diffraction. Dielectric properties were studied as a function of temperature and frequency presuming that the interactions between the piezoelectric and magnetostrictive phases may result in various anomalies in the dielectric properties of these composites. To study the ferroelectric properties, P-E hysteresis loops were recorded.
Multiferroic properties of composites of PLZT and substituted CoFe2O4
Dipti,Parveen Kumar,J. K. Juneja,Sangeeta Singh,K.K. Raina,Chandra Prakash 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4
The magnetoelectric composite with composition xCo0.8Ni0.2Fe2O4 + (1-x) Pb0.9925La0.005Zr0.55Ti0.45O3, x = 0.00, 0.05, 0.10, 0.15 and 1.00 were prepared by solid state reaction method. The structural, microstructural, dielectric, ferroelectric and magnetic properties were studied. The X-ray diffraction and Reitveld refinement of samples confirm the formation of mixed phases of tetragonal and cubic spinel structure in composite. The microstructure of composites shows the coexistence both types of grains corresponding to their phases. Frequency dependent dielectric studies at room temperature depict the decrease in dielectric constant (ε) and increase in tangent loss (tanδ) in composites with increase in ferrite content. P-E Hysteresis loop and M-H hysteresis loop confirms the ferroelectric and ferromagnetic nature of composites. Existence of P-E (ferroelectric) and MH (magnetic) at room temperature confirms the multiferroicity in the composites.