Ferroelectric–Ferromagnetic Composites Based on PZT Type Powder and Ferrite Powder (original) (raw)
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Ferroelectric-Ferromagnetic Ceramic Composites Based on PZT with Added Ferrite
International Journal of Applied Ceramic Technology, 2014
The study presents a ferroelectric-ferromagnetic composite based on a doped PZT-type and ferrite powders. Ferroelectric powder (in amount of 90 wt-%) was based on multicomponent PZT-type materials, while nickel-zinc ferrite Ni 1-x Zn x Fe 2 O 4 (in amount of 10 wt-%) served as the magnetic component of the composite. The syntheses of the ferroelectric-ferromagnetic composite's components were performed using solid-phase sintering, while final densification of the synthesized powder was achieved using free sintering. X-ray analysis of the composite confirmed the presence of strong maxima originating from particular PZTtype material phases, as well as weak peaks from the Ni 0.64 Zn 0.36 Fe 2 O 4 ferrite , without foreign phases. The microstructure of the fracture of the ferroelectric-ferromagnetic composites shows that the ferrite grains on the surface of the ferroelectric component are distributed heterogeneously. Magnetic studies have characterized composite as a soft ferromagnetic material. The study indicated the influence of the magnetic subsystem on the electrical properties. In the two-phase PBZTMC-NZF ceramic composite, the magnetic component causes the decrease in electric permittivity and increased value of the dielectric losses.
Ceramics International, 2018
Comparative study of different PZT-based composite materials ((x)PbZr 0.52 Ti 0.48 O 3 + (1-x)CoFe 2 O 4 and (x)PbZr 0.52 Ti 0.48 O 3 +(1-x)Ni 0.7 Zn 0.3 Fe 2 O 4 (x=0.8 and 0.9)) is presented in the frame of structural, dielectric, ferroelectric and magnetic properties. PZT and NZF/CF powders were synthesized by auto combustion technique. The composites were synthesized by mixing the appropriate amount of individual phases using conventional sintering. XRD data indicated the formation of well crystallized structure of PZT and NZF/CF, without the presence of undesirable phases. SEM micrographs revealed a uniform grain distribution of both, ferroelectric and ferromagnetic phases. Non-saturated hysteresis loops are evident in all samples due to the existence of non-ferroelectric ferrite phase. All the samples exhibit typical ferromagnetic hysteresis loop, indicating the presence of the order magnetic structure. Dielectric investigations revealed that ferrites are the main source of charge carriers, which must be of electronic origin. The activation energy of effective electrical resistivity is heavily influenced by the ferroelectric phase.
2021
In this paper, ferroelectric–ferrimagnetic ceramic composites based on multicomponent PZT-type (PbZr1−xTixO3-type) material and ferrite material with different percentages in composite compositions were obtained and studied. The ferroelectric component of the composite was a perovskite ceramic material with the chemical formula Pb0.97Bi0.02(Zr0.51Ti0.49)0.98(Nb2/3Mn1/3)0.02O3 (P), whereas the magnetic component was nickel-zinc ferrite with the chemical formula Ni0.5Zn0.5Fe2O4 (F). The process of sintering the composite compounds was carried out by the free sintering method. Six ferroelectric-ferrimagnetic ceramic P-F composite compounds were designed and obtained with different percentages of its components, i.e., 90/10 (P90-F10), 85/15 (P85-F15), 80/20 (P80-F20), 60/40 (P60-F40), 40/60 (P40-F60), and 20/80 (P20-F80). X-ray diffraction patterns, microstructural, ferroelectric, dielectric, magnetic properties, and DC electrical conductivity of the composite materials were investigate...
Ferroelectric-Ferromagnetic Composites of Based
2013
Ferroelectric-ferromagnetic composites based on ferroelectromagnetic PbFe1/2Nb1/2O3 powder and ferrite powder (zinc-nickel ferrite-NiZnFe and zinc-manganese ferrite-MnZnFe) were obtained in the presented study. The volume fraction of ferroelectromagnetic powder in the composite PFN-MnZnFe was equal to 90%, while the ferrite powder fraction was 10%. Synthesis of the components of the ferroelectric-ferromagnetic composite was done by the powder calcination method. Final densification was done by the pressureless sintering method. On the obtained ferroelectric-ferromagnetic composites, XRD investigations were performed as well as investigations of the microstructure, EDS, dielectric, magnetic, internal friction and electrical hysteresis loop. The results of these investigations have shown that the combination of ferroelectromagnetic PFN with magnetic ferrite caused an increase in the value of the dielectric permittivity of the composite. Therefore, the addition of the ferrite (Ni1-xZnxFe2O4, Mn1-xZnxFe2O4) as an additional component improves the magnetic properties of the PFN-ferrite composite. Taking into account the fact that the electric conductivity of zinc-manganese ferrite (MnZnFe) is higher than the zinc-nickel ferrite (NiZnFe), it seems to be a better material for obtaining composites based on ferrite and PFN powders.
Materials
This paper presents the research results of multiferroic ceramic composites obtained with three sintering methods, i.e., free sintering FS (pressureless), hot pressing HP, and spark plasma sintering SPS. The multiferroic composite was obtained by combining a ferroelectric material of the PZT-type (90%) and zinc-nickel ferrite (10%). Research has shown that the combination of a magnetic material and ferroelectric materials maintains the multiferroic good ferroelectric and magnetic properties of the composites for all sintering methods. A sample sintered with the HP hot pressing method exhibits the best parameters. In the HP method, the composite sample has high permittivity, equal to 910 (at room temperature) and 7850 (at the phase transition temperature), residual polarization 2.80 µC/cm2, a coercive field of 0.95 kV/mm, and the magnetization of 5.3 and 4.95 Am2/kg at −268 °C and RT, respectively. Optimal technological process conditions are ensured by the HP method, improving the s...
Microstructure and Properties of the Ferroelectric-Ferromagnetic PLZT-Ferrite Composites
Symmetry
The paper presents the technology of ferroelectric-ferromagnetic ceramic composites obtained from PLZT powder (the chemical formula Pb 0.98 La 0.02 (Zr 0.90 Ti 0.10) 0.995 O 3) and ferrite powder (Ni 0.64 Zn 0.36 Fe 2 O 4), as well as the results of X-ray powder-diffraction data (XRD) measurement, microstructure, dielectric, ferroelectric, and magnetic properties of the composite samples. The ferroelectric-ferromagnetic composite (P-F) was obtained by mixing and the synthesis of 90% of PLZT and 10% of ferrite powders. The XRD test of the P-F composite shows a two-phase structure derived from the PLZT component (strong peaks) and the ferrite component (weak peaks). The symmetry of PLZT was identified as a rhombohedral ferroelectric phase, while the ferrite was identified as a spinel structure. Scanning electron microscope (SEM) microstructure analysis of the P-F ceramic composites showed that fine grains of the PLZT component surrounded large ferrite grains. At room temperature P-F composites exhibit both ferroelectric and ferromagnetic properties. The P-F composite samples have lower values of the maximum dielectric permittivity at the Curie temperature and a higher dielectric loss compared to the PLZT ceramics, however, the exhibit overall good multiferroic properties.
Ferroelectric Properties of Microwave Processed PZT-NiZn Ferrite Composites
Integrated Ferroelectrics, 2010
Being materials with a large number of interesting properties, ferroelectric-ferrite based composites have recently been developed. People are showing a great interest in these materials due to some unique properties like magnetoelectric effect in addition to the ferroelectric, dielectric and magnetic properties. After a review of literature it is found that the variation in different properties of PZT ceramics is found to depend on the amount of ferrite content. In this paper, we are reporting the variation in ferroelectric properties of PbZr0.65Ti0.35O3 (PZT) by varying Ni-Zn ferrite (NZF) content. The studied system having compositional formula (1-x) PZT–x NZF (0 ≤ x ≤ 0.025, in steps of 0.005), was prepared by solid state route using microwave sintering. Remanant polarization was found to be monotonically decreasing with increasing ferrite content as observed from the recorded P-E hysteresis loops for all the samples at 20 Hz. Microwave sintering results in significant improvements in properties as compared to conventionally sintered samples.
Ferroelectric-ferromagnetic composites of based on Pb(Fe1/2Nb1/2)O3
2013
Ferroelectric-ferromagnetic composites based on ferroelectromagnetic PbFe1/2Nb1/2O3 powder and ferrite powder (zinc-nickel ferrite-NiZnFe and zinc-manganese ferrite-MnZnFe) were obtained in the presented study. The volume fraction of ferroelectromagnetic powder in the composite PFN-MnZnFe was equal to 90%, while the ferrite powder fraction was 10%. Synthesis of the components of the ferroelectric-ferromagnetic composite was done by the powder calcination method. Final densification was done by the pressureless sintering method. On the obtained ferroelectric-ferromagnetic composites, XRD investigations were performed as well as investigations of the microstructure, EDS, dielectric, magnetic, internal friction and electrical hysteresis loop. The results of these investigations have shown that the combination of ferroelectromagnetic PFN with magnetic ferrite caused an increase in the value of the dielectric permittivity of the composite. Therefore, the addition of the ferrite (Ni1-xZnx...
Investigation of Phase Formation and Electrical Properties of Fe-Doped PZT Ceramics
2021
In this paper, some compositions described by the general formula Pb(ZrxTi1-x)0.99Fe0.01O3 have been considered and investigated. The compositions considered have been obtained by solid state reaction technique, where x corresponds to 0.42, 0.52 and 0.58. Sintering has been performed for 2 hours at temperatures between 1100oC and 1250oC. The influence of the sintering temperature on the microstructure and on the hysteresis loops of Fe3+ doped Pb(ZrxTi1-x)O3 system has been investigated. The crystallographic phase and microstucture of the sintered compositions have been studied in detail using X-ray diffraction analysis (XRD) and Scanning Electron Microscopy (SEM). The experimental results obtained by XRD have revealed that all the sintered samples have a perovskite structure. In order to correlate the behavior of the sintered materials to their microscopic structure, the domain structures have been defined by SEM. The dielectric properties, as relative dielectric permittivity (εr) a...
Multiferroic properties of Ni ferrite—PLZT composites
Physica B: Condensed Matter, 2010
The ferroelectric, magnetic and magnetoelectric properties of (x) NiFe 2 O 4 [NFO] +(1 À x) Pb 0.93 La 0.07 (Zr 0.60 Ti 0.40)O 3 [PLZT] composites, where (x =0, 0.15, 0.30, 0.45, and 1) synthesized using double sintering ceramic method were studied. Structural analysis of these composites using X-ray diffraction (XRD) techniques confirms presence of both the phases in the composite without any impurity or intermediate phase. The scanning electron microscopy (SEM) images recorded in backscattered mode was used to study the microstructure and investigate connectivity scheme in composites. Observation of well saturated ferroelectric hysteresis loops for PLZT phase and their composites, and magnetic hysteresis loops for NFO and composites samples confirms the ferroelectric and magnetic nature of the samples. The magnetoelectric (ME) coefficient (dE/dH) was noted as a function of dc magnetic field for two different orientations viz. transverse and longitudinal and different content of magnetostrictive-piezoelectric phases. Maximum value of static ME voltage coefficient obtained for transverse orientation was 8.9 mV/cm * Oe in 15% NFO +85%PLZT bulk composites.