scholarly journals Electrophysical Properties of PMN-PT-Ferrite Ceramic Composites

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3281 ◽  
Author(s):  
Bochenek ◽  
Niemiec ◽  
Skulski ◽  
Brzezińska
Keyword(s):  
Dielectric Properties ◽  
Ceramic Composite ◽  
Sol Gel ◽  
Ceramic Composites ◽  
Ceramic Technology ◽  
Ferrite Powder ◽  
Electromechanical Properties ◽  
Magnetic Subsystem ◽  
Zn Ferrite ◽  
Composite Samples

Ferroelectromagnetic composites based on (1−x)PMN-(x)PT (PMN-PT) powder and Ni-Zn ferrite powder were obtained and are described in this work. As a ferroelectric component, we used (1−x)PMN-(x)PT solid solution (with x = 0.25, 0.28, 0.31, 0.34, 0.37, 0.40), synthesized using the sol-gel method. As a magnetic component, we used nickel-zinc ferrite, obtained using classic ceramic technology. The six compositions of PMN-PT used have rhombohedral symmetry, tetragonal one and mixture of these phases (morphotropic phase area), depending on x. The final ceramic composite samples were obtained using the classic methods involving the calcination route and pressureless final sintering (densification). The properties of the obtained ceramic composite samples were investigated, including microstructure SEM (scanning electron microscope), dielectric properties, electromechanical properties, and DC (Direct Current) electrical conductivity. Results showed that the microstructures of the PP-F composite samples characterized by larger grains were better crystallized, compared with the microstructures of the PMN-PT ceramic samples. The magnetic properties do not depend on the ferroelectric component of the composite samples, while the insertion of ferrite into the PMN-PT compound reduces the values of remnant and spontaneous polarization, as well as the coercive field. The dielectric measurements also indicated that the magnetic subsystem influences the dielectric properties. The present results show that the PP-F ceramic composite has good dielectric, magnetic, and piezoelectric properties, which predisposes this type of material to specific applications in microelectronics and micromechatronics.

Technology and Main Properties of PMN-PT-Ferrite Multiferroic Ceramic Composite Materials

2016 ◽  
Vol 98 ◽  
pp. 3-8
Author(s):  
Ryszard Skulski ◽  
Dariusz Bochenek ◽  
Przemysław Niemiec ◽  
Dagmara Brzezinska ◽  
Artur Chrobak
Keyword(s):  
Ceramic Composite ◽  
Sol Gel ◽  
Composite Ceramic ◽  
Ceramic Technology ◽  
Ferrite Powder ◽  
Classic Method ◽  
Zn Ferrite ◽  
Morphotropic Region ◽  
Multiferroic Ceramic ◽  
Composite Samples

In the presented work composite ferroelectric/ferrimagnetic ceramics have been obtained and described. The investigated material is based on PMN-PT powders and Ni-Zn ferrite powder. The Powders of ferroelectric component (i.e. (1–x)PMN-(x)PT with x from 0.25 to 0.40 with step 0.03 were synthesized using the sol-gel method. The magnetic component i.e. nickel-zinc ferrite was obtained from oxides using the classic method of obtaining ceramics. The compositions of PMN–PT used by us have rhombohedral or tetragonal symmetries, or belong to morphotropic region. The final ceramic composite samples were obtained using the classic method of ceramic technology with calcination route and final pressureless densification using free sintering. In this paper, XRD, EDS dielectric and magnetic properties have been investigated and described for the obtained composite ceramic samples.

Synthesis and characterization of anatase TiO2 nanolayer coating on Ni–Cu–Zn ferrite powders for magnetic photocatalyst

2010 ◽  
Vol 25 (1) ◽  
pp. 134-140 ◽  
Author(s):  
Yen-Pei Fu ◽  
Wen-Ku Chang ◽  
Hsin-Chao Wang ◽  
Chung-Wen Liu ◽  
Cheng-Hsiung Lin
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Degradation Efficiency ◽  
Ferrite Powder ◽  
Order Kinetic ◽  
Magnetic Photocatalyst ◽  
The Core ◽  
Zn Ferrite

In the current research, we successfully prepared TiO2/Ni–Cu–Zn ferrite composite powder for magnetic photocatalyst. The core Ni–Cu–Zn ferrite powder was synthesized using the steel pickling liquor and the waste solution of electroplating as the starting materials. The shell TiO2 nanocrystal was prepared by sol-gel hydrolysis precipitation of titanium isopropoxide [Ti(OC3H7)4] on the Ni–Cu–Zn ferrite powder followed by heat treatment. From transmission electron microscopy (TEM) image, the thickness of the titania shell was found to be approximately 5 nm. The core of Ni–Cu–Zn ferrite is spherical or elliptical shape, and the particle size of the core is in the range of 70–110 nm. The magnetic Ni–Cu–Zn ferrite nanopowder is uniformly encapsulated in a titania layer forming core-shell structure of TiO2/Ni–Cu–Zn ferrite powder. The degradation efficiency for methylene blue (MB) increases with magnetic photocatalyst (TiO2/Ni–Cu–Zn ferrite powder) content. When the magnetic photocatalyst content is 0.40 g in 150 mL of MB, the photocatalytic activity reached the largest value. With a further increase in the content of magnetic photocatalyst, the degradation efficiency slightly decreased. This occurs because the ultraviolet (UV) illumination is covered by catalysts, which were suspended in the methylene blue solution and resulted in the inhibition in the photocatalytic reaction. The photocatalytic degradation result for the relationship between MB concentration and illumination revealed a pseudo first-order kinetic model of the degradation with the limiting rate constant of 1.717 mg/L·min and equilibrium adsorption constant 0.0627 L/mg. Furthermore, the Langmuir–Hinshelwood model can be used to describe the degradation reaction, which suggests that the rate-determining step is surface reaction rather than adsorption is in photocatalytic degradation.

Influence of Oxygen Annealing on Electromagnetic Properties of Low Temperature Fired Ferrite/Ceramic Composite Materials

2013 ◽  
Vol 721 ◽  
pp. 215-218
Author(s):  
Wei Wei Ling ◽  
Wen Ying Ma ◽  
Cheng Xin Xu ◽  
Zhu Chen
Keyword(s):  
Composite Materials ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Ceramic Composite ◽  
Frequency Characteristics ◽  
Electromagnetic Properties ◽  
Oxygen Annealing ◽  
Zn Ferrite ◽  
Mass Ratios ◽  
Ceramic Composite Materials

Ni-Cu-Zn ferrite (NCZF) /BaTiO3 (BT) composites with different mass ratios of BT/NCZF (x) were prepared at 900°C with suitable fluxing agents. The sintered samples were then annealed in oxygen to reduce the amount of Fe2+ ions. Influence of annealing on electromagnetic properties and frequency characteristics of the samples has been investigated. The Snoek product can be somewhat improved by annealing in samples with x=10wt%, 20wt%, and 30wt%. The dielectric properties can be obviously improved in samples with x=10wt% and 30wt% after annealing in O2.

scholarly journals Electrophysical properties of the multiferroic PFN–ferrite composites obtained by spark plasma sintering and classical technology

2020 ◽  
Vol 126 (11) ◽  
Author(s):  
Przemysław Niemiec ◽  
Joanna A. Bartkowska ◽  
Dagmara Brzezińska ◽  
Grzegorz Dercz ◽  
Zbigniew Stokłosa
Keyword(s):  
Spark Plasma Sintering ◽  
Ferroelectric Properties ◽  
Ceramic Composites ◽  
Ferrite Powder ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ferrite Composites ◽  
Sintering Method ◽  
Composite Samples

AbstractThe multiferroic (ferroelectric–ferromagnetic) composites (PFN–ferrite) based on ferroelectromagnetic PbFe1/2Nb1/2O3 powder and ferrite powder (zinc–nickel ferrite, NiZnFeO4) were obtained in the presented study. The ceramic PFN–ferrite composites consisted of 90% powder PFN material and 10% powder NiZnFeO4 ferrite. The ceramic powders were synthesized by the classical technological method using powder calcination, while densification of the composite powders (sintering) was carried by two different methods: (1) free sintering method (FS) and (2) spark plasma sintering (SPS). The composite PFN–ferrite samples were thermally tested, including DC electrical conductivity and dielectric properties. Besides, XRD, SEM, EDS (energy-dispersive spectrometry) and ferroelectric properties (hysteresis loop) of the composite samples were tested at room temperature. At the work, a comparison was made for the results measured for PFN–ferrite composite samples obtained by two methods. The X-ray examination of multiferroic ceramic composites confirmed the occurrence of the strong diffraction peaks derived from ferroelectric (PFN) matrix of composite as well as weak peaks induced by the ferrite component. At the same time, the studies showed the absence of other undesired phases. The results presented in this work revealed that the ceramic composite obtained by two different technological sintering methods (free sintering method and spark plasma sintering technique) can be the promising materials for functional applications, for example, in sensors for magnetic and electric fields.

Porous Nitride Ceramic Composites with Low-Dielectric Properties

2012 ◽  
Vol 512-515 ◽  
pp. 849-853
Author(s):  
Rong Liao ◽  
Chong Hai Wang ◽  
Jian Liu ◽  
Hong Sheng Wang ◽  
Qi Hong Wei
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Small Addition ◽  
Sem Micrographs ◽  
Low Dielectric

The influences of the mullite hollow balls content on selected properties of Si3N4-BN matrix ceramics were investigated.The experiment showed that the apparent densities and the porosity of the nitride ceramic composites decreased as the mullite hollow balls contents increased.The strength of the porous nitride ceramic composite was greatly improved, and the dielectric constant decreased with a small addition of the mullite hollow balls. SEM micrographs showed that the mullite hollow balls became one flesh with the nitride ceramic composites.Many large pores appeared in the whole materials. The properties of the nitride ceramic composites were effectively improved.

scholarly journals BORON CARBIDE BASED CERAMIC COMPOSITES HOT PRESSED WITH ALUMINIUM ADDITIVE

2020 ◽  
Vol 26 (2) ◽  
pp. 67-69
Author(s):  
Pavol Švec ◽  
Zuzana Gábrišová ◽  
Alena Brusilová ◽  
Ľubomír Čaplovič
Keyword(s):  
Ceramic Composite ◽  
Secondary Phase ◽  
Ceramic Composites ◽  
Additive Concentration ◽  
Sintering Additives ◽  
Average Value ◽  
Sintering Additive ◽  
Vacuum Atmosphere ◽  
Composite Samples

Ceramic composite materials consisting of B4C matrix and Al8B4C7 secondary phase were prepared by in situ reactive sintering of the initial powder mixture B4C-Al with concentration from 5 to 25 wt.% Al sintering additives. The composite samples were hot pressed at the temperature of 1850 °C, pressure of 35 MPa, for 15 min in a vacuum atmosphere. The portion of Al8B4C7 secondary phase increased from 3.3 to 22.1 wt.% when increasing the concentration of Al sintering additive from 5 to 25 wt.% Al. Significant improving of densification and mechanical properties was measured at increasing of Al sintering additive concentration from 5 to 10 wt.% Al. The highest average hardness of 28.74 GPa was achieved when adding 15 wt.% Al sintering additive. The fracture toughness increased with concentration of Al sintering additive in whole concentration range with the highest average value of 5.92 MPa.m1/2 at 25 wt.% Al sintering additives.

Fabrication of the SiOC/HfO2 Ceramic Composites by the Sol-Gel Method

2012 ◽  
Vol 512-515 ◽  
pp. 912-915
Author(s):  
Dai Shou ◽  
Ding Shan Ruan ◽  
Feng Hou
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Ir Spectra ◽  
Ceramic Composite ◽  
Raw Materials ◽  
Sol Gel ◽  
Ceramic Composites ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

In this paper, Hf element was introduced into the Si-O-C network by the sol-gel method using the dimethyldiethoxysiloxane (DMDES, (CH3)2Si(OC2H5)2) and hafnium tetra(n-butoxide) (HfOR, Hf(OC4H9)4) as raw materials. The SiOC/HfO2 ceramic composite was obtained by pyrolyzing Si-Hf-O-C gel at 1000 °C in argon. FT-IR spectra revealed the presence of Si-O-Hf peaks at 932 cm-1. The weight loss of the as-prepared SiOC/HfO2 was about 0.2 wt.% under argon atmorsphere up to 1550 °C, which was much lower than the hafnia-free SiOC composites and exhibited a remarkable improved thermal stability.

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