High frequency properties of high voltage barium titanate-ferrite multiferroic metamaterial composites

Noel, Kelli M.; Pearson, Aric M.; Curry, R. D.; O’Connor, Kevin

doi:10.1109/tdei.2016.7736859

Cited by 10 publications

(4 citation statements)

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“…In addition, BaTiO 3 and Al 2 O 3 composites and devices have recently been reported as novel metamaterials [ 34 , 35 , 36 , 37 , 38 ], which can be applied in optical cloaking [ 39 ] and biochemical sensing [ 36 , 40 , 41 , 42 , 43 , 44 ] and detection [ 41 , 42 ], protein analysis [ 45 ], food quality analysis, and telecommunication [ 46 ], etc. They can also be used in tumor treatment, and radar cross-section reduction [ 46 , 47 ] as a therapeutic tool or a polarization conversion device due to their unique dielectric and electromagnetic properties [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Yao

Zhou

et al. 2018

Materials

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Multifunctional polymer composites with both high dielectric constants and high thermal conductivity are urgently needed by high-temperature electronic devices and modern microelectromechanical systems. However, high heat-conduction capability or dielectric properties of polymer composites all depend on high-content loading of different functional thermal-conductive or high-dielectric ceramic fillers (every filler volume fraction ≥ 50%, i.e., ffiller ≥ 50%), and an overload of various fillers (fthermal-conductive filler + fhigh-dielectric filler > 50%) will decrease the processability and mechanical properties of the composite. Herein, series of alumina/barium titanate/polypropylene (Al2O3/BT/PP) composites with high dielectric- and high thermal-conductivity properties are prepared with no more than 50% volume fraction of total ceramic fillers loading, i.e., ffillers ≤ 50%. Results showed the thermal conductivity of the Al2O3/BT/PP composite is up to 0.90 W/m·K with only 10% thermal-conductive Al2O3 filler, which is 4.5 times higher than the corresponding Al2O3/PP composites. Moreover, higher dielectric strength (Eb) is also found at the same loading, which is 1.6 times higher than PP, and the Al2O3/BT/PP composite also exhibited high dielectric constant (εr = 18 at 1000 Hz) and low dielectric loss (tan δ ≤ 0.030). These excellent performances originate from the synergistic mechanism between BaTiO3 macroparticles and Al2O3 nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Yao

Zhou

et al. 2018

Materials

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“…Ceramics’ most alluring magnetic property is its minimal loss with higher permeability in the high‐frequency region. [ 59 ] Complex permeability, which is determined by the dynamic reactions of magnetic domains to the applied field, includes details about the inertial position, organization, and mutual interaction of the domain walls. [ 60 ] Consequently, the information with different frequencies received from complex permeability is crucial for knowing the mechanism of dynamic features and the effectiveness of these ceramics in high‐frequency‐operating devices used in our daily lives.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Mahmud

Ahamed

Khan

2023

Physica Status Solidi (a)

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Considering the multifunctional performance, the (Ba0.7Sr0.3)0.98Ca0.02Ti1−xCoxO3 (x = 0.00–0.2) ceramics are successfully synthesized using the traditional solid‐phase reaction method. The effect of cobalt doping on the samples’ structural, morphological, magnetic, electrical, and optical characteristics is elucidated. Raman spectroscopy and X‐ray diffraction data confirm the dopants’ integration into the cubic perovskite microstructure. At room temperature, the magnetization–magnetic field intensity hysteresis loops from vibrating sample magnetometer reveal the samples’ ferromagnetic character, with a maximum magnetization of 0.091 emu g−1 achieved for x = 15%. The real part of the initial permeability demonstrates that the replacement of Co2+ causes a shift in resonance toward higher frequencies above 85 MHz, indicating the potential of the synthesized ceramics for high‐frequency magnetic applications. The variation in dielectric characteristics from 100 Hz to 10 MHz is explained using electron hopping on octahedral sites and Maxwell–Wagner's model. The increase of AC conductivity in the high‐frequency region is consistent with the strengthening of the grain effect on the conduction mechanism, which supports the small‐range polaron‐hopping theory. The complex electric modulus's peak (M′′) shifts toward a higher‐frequency region with cobalt content, suggesting a reduction in the relaxation rate. The optical bandgap is observed to decrease from 3.08 to 2.96 eV with cobalt content.

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“…The permittivity and permeability of barium titanate-ferrite was examined for application in a nonlinear capacitor exhibiting nonlinearity under high voltage pulses. The metamaterial and insulation of magnetic particles with a dielectric layer were tested [120]. Another study constructed a stripline gyromagnetic NLTL from yttrium iron garnet ferrite.…”

Section: B Experimental Contributionsmentioning

confidence: 99%

A Review of Nonlinear Transmission Line System Design

2020

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Nonlinear transmission lines (NLTLs) have been increasingly studied to produce high power microwaves (HPM) at higher repetition rates than conventional HPM devices without requiring the same auxiliary systems. The ability to array NLTLs to produce higher power and achieve beam steering provides an additional capability. This review summarizes the various NLTL topologies designed to achieve these design objectives. Specifically, we summarize modeling and experimental studies for three primary topologies: the lumped element NLTL, the split ring resonator, and the traditional transmission line geometry using nonlinear materials. The lumped element NLTL and the traditional transmission line constructed with nonlinear materials lend themselves to higher power applications, while the split ring resonator is better suited for applications involving antennas. We provide a detailed summary of past studies for these topologies and conclude by exploring ongoing work and future opportunities for technological development.

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High frequency properties of high voltage barium titanate-ferrite multiferroic metamaterial composites

Cited by 10 publications

References 10 publications

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

A Review of Nonlinear Transmission Line System Design

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High frequency properties of high voltage barium titanate-ferrite multiferroic metamaterial composites

Cited by 10 publications

References 10 publications

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba0.7Sr0.3)0.98Ca0.02Ti1−XCoxO3 Ceramics for Device Applications

A Review of Nonlinear Transmission Line System Design

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Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications