In situ sol–gel co-synthesis under controlled pH and microwave sintering of PZT/CoFe 2 O 4 magnetoelectric composite ceramics

Fernandez, C. P.; Zabotto, F. L.; Garcia, D.; Kiminami, R. H. G. A.

doi:10.1016/j.ceramint.2015.10.115

Cited by 31 publications

(8 citation statements)

References 27 publications

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“…TG curves exhibit two major losses: The first one was approximately 3% and located between 30 and 250°C, which may be due to the decomposition of the gel and elimination of water content from the prepared sample, and the second was approximately 8% and occurring between 250 and 475°C due to the major decomposition reaction of citric acid carboxyl groups and the autocatalytic reaction between nitrate, chloride, and citrate system. Presence of one exothermic peak in DSC curve at 450°C indicates the beginning of crystallization of the perovskite phase …”

Section: Resultsmentioning

confidence: 99%

“…Presence of one exothermic peak in DSC curve at 450°C indicates the beginning of crystallization of the perovskite phase. 24,25 3.5 | Electrical analysis for all samples at frequency 10 kHz. From these results, it is revealed that e increases with temperature up to the Curie temperature (T C ) at which point the phase transition takes place between ferroelectric and paraelectric phases and then it decreases.…”

Section: Thermal Analysesmentioning

confidence: 99%

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Dielectric and piezoelectric performance of gadolinium‐doped lead lanthanum zirconate titanate

Mansour

Eid

El-Latif

et al. 2017

Int J Applied Ceramic Tech

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In this article, polycrystalline samples of Gd3+ ion‐modified lead lanthanum zirconate titanate PLGZT: (Pb0.94‐xGdxLa0.06)(Zr0.52Ti0.48)O3; x = 0, 2, 4, 6, and 8% have been prepared by the sol‐gel autocombustion strategy. The structural properties of the prepared samples were analyzed by X‐ray diffraction profile (XRD), Fourier transform infrared spectra (FT‐IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The samples were assigned to pure PZT perovskite tetragonal structure. Ag electrodes were made on both sides of the disks for measurements of electrical and dielectric properties at different temperatures ranging from 30 to 500°C at various frequencies. The maximum dielectric constant, Curie temperature (TC), dielectric loss at TC, and the piezoelectric charge coefficient d33 ranges of the investigated samples were found to be 1850 to 2420, 350 to 399°C, 0.023 to 0.026, and 299 to 532 pC/N, respectively. Higher coefficients were reached for the 4 % Gd substitution. Finally, the obtained results indicate that these materials can be good candidates for ultrasonic transducers.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysesmentioning

confidence: 99%

Dielectric and piezoelectric performance of gadolinium‐doped lead lanthanum zirconate titanate

Mansour

Eid

El-Latif

et al. 2017

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…The investigations of their physical and chemical properties incorporate several areas of physics, from magnetism to optics through chemistry and mechanics [11,12] competitive in the market of soft magnetic materials [13][14][15]. The field of application of ferrites may even be expanded to magnetoelectric devices when combining them with a piezoelectric materials, e.g., as nanocomposite, core/shell or laminated composite [16][17][18][19]. Spinel ferrite form crystals with cubic symmetry similar to those of MgAl 2 O 4 natural mineral spinel.…”

Section: Introductionmentioning

confidence: 98%

Structural and magnetic properties of Co0.7Ni0.3Fe2O4 nanoparticles synthesized by sol–gel method

et al. 2016

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In this paper, we present the structural and magnetic properties of Co 0.7 Ni 0.3 Fe 2 O 4 nanoparticles. The nanoparticles are prepared by the sol-gel method; structural analysis by X-ray diffraction shows that the nanoparticles are pure phase with the spinel structure. Transmission electron microscopy analysis reveals the local microstructure of the particles and their size range of 6-8 nm, with isometric shape. The magnetic properties obtained with magnetic properties measurement system demonstrate the soft magnetic character of the nanoparticles.

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“…However, for particulate composites where spinel grains are dispersed within the perovskite matrix (0-3 connectivity), the electric resistivity of the material is reduced due to the non-negligible conductivity of the magnetic phase. As a result, non-saturated hysteresis loops are evident in all particulate ME composites [19,30,38,39]. Actually, uncontrolled partial poling is likely behind the large variability in ME responses.…”

Section: Introductionmentioning

confidence: 99%

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

et al. 2020

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In this work, we investigated the processing-microstructure-property relationships for magnetoelectric (ME) particulate composites consisting of hard ferromagnetic CoFe2O4 (CFO) particles dispersed in a Nb-doped PbZrxTi1-xO3 (PZT) soft ferroelectric matrix. Several preparation steps, namely PZT powder calcination, PZT-CFO mixture milling and composite sintering were tailored and a range of microstructures was obtained. These included open and closed porosities up to full densification, PZT matrices with decreasing grain size across the submicron range down to the nanoscale and well dispersed CFO particles with bimodal size distributions consisting of submicron and micron sized components with varying weights. All samples could be poled under a fixed DC electric field of 4 kV/mm and the dielectric, piezoelectric and elastic coefficients were obtained and are discussed in relation to the microstructure. Remarkably, materials with nanostructured PZT matrices and open porosity showed piezoelectric charge coefficients comparable with fully dense composites with coarsened microstructure and larger voltage coefficients. Besides, the piezoelectric response of dense materials increased with the size of the CFO particles. This suggests a role of the conductive magnetic inclusions in promoting poling. Magnetoelectric coefficients were obtained and are discussed in relation to densification, piezoelectric matrix microstructure and particle size of the magnetic component. The largest magnetoelectric coefficient α33 of 1.37 mV cm−1 Oe−1 was obtained for submicron sized CFO particles, when closed porosity was reached, even if PZT grain size remained in the nanoscale.

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In situ sol–gel co-synthesis under controlled pH and microwave sintering of PZT/CoFe 2 O 4 magnetoelectric composite ceramics

Cited by 31 publications

References 27 publications

Dielectric and piezoelectric performance of gadolinium‐doped lead lanthanum zirconate titanate

Dielectric and piezoelectric performance of gadolinium‐doped lead lanthanum zirconate titanate

Structural and magnetic properties of Co0.7Ni0.3Fe2O4 nanoparticles synthesized by sol–gel method

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

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