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Journal articles on the topic 'Low-frequency permittivity'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Chern, Gung, H. Mathias, L. R. Testardi, L. Seger, and J. Schlenoff. "Low-frequency dielectric permittivity of C60." Journal of Superconductivity 8, no. 2 (1995): 207–10. http://dx.doi.org/10.1007/bf00732372.

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2

Sedelnikova, Olga V., Kseniya I. Baskakova, Artem V. Gusel’nikov, Pavel E. Plyusnin, Lyubov G. Bulusheva, and Alexander V. Okotrub. "Percolative Composites with Carbon Nanohorns: Low-Frequency and Ultra-High Frequency Response." Materials 12, no. 11 (2019): 1848. http://dx.doi.org/10.3390/ma12111848.

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We systematically studied the electromagnetic properties of carbon nanohorns (CNHs) and polystyrene composites filled with CNHs in static regime, low frequency and microwave regions. CNHs were synthesized using the direct current arc-discharge method using solid graphite rods and graphite rods filled by melamine mixed with graphite powder. Transmission electron microscopy and thermo-gravimetric analysis showed that CNH agglomerates are the main product, while the addition of melamine promotes the formation of graphite balls. Graphitic contamination causes the internal leakage of inter-agglomer

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3

Sun, Kai, Ao Ma, Pengtao Yang, et al. "Flexible Copper Nanowire/Polyvinylidene Fluoride Membranous Composites with a Frequency-Independent Negative Permittivity." Polymers 15, no. 23 (2023): 4486. http://dx.doi.org/10.3390/polym15234486.

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With the increasing popularity of wearable devices, flexible electronics with a negative permittivity property have been widely applied to wearable devices, sensors, and energy storage. In particular, a low-frequency dispersion negative permittivity in a wide frequency range can effectively contribute to the stable working performance of devices. In this work, polyvinylidene fluoride (PVDF) was selected as the flexible matrix, and copper nanowires (CuNWs) were used as the conductive functional filler to prepare a flexible CuNWs/PVDF composite film with a low-frequency dispersion negative permi

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4

Emerson, D. W., and H. K. Welsh. "Low‐frequency permittivities of skarns and associated rocks." GEOPHYSICS 53, no. 9 (1988): 1233–40. http://dx.doi.org/10.1190/1.1442564.

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The lossy dielectric properties of dry heterogeneous skarns and associated rocks vary significantly when the real (ε′) and quadrature (ε″) permittivity responses are measured between 1 Hz and 160 kHz. Ores containing iron oxides and/or sulfides show very large permittivity values and high loss tangents with some dc conductivity. Unmineralized skarns manifest large ε′ and moderate ε″ values. Country rock, limestones, and granitoids show relatively low permittivities. The dielectric responses are ascribed generally to Maxwell‐Wagner mechanisms. No clear, convincing correlations are apparent betw

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5

D’Alvia, Livio. "Low-Frequency Measurement of Moistened Wood-Based Materials." Metrology 5, no. 1 (2025): 1. https://doi.org/10.3390/metrology5010001.

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This article examines how water content is a crucial parameter for the preservation of wooden artworks and buildings, focusing on non-invasive ways of measuring water content through capacitive methods. A personalized, low-cost probe to measure the dielectric properties of oak and poplar wood at various water content levels and frequencies is described. The accuracy of the probe is confirmed by testing it with reference materials like air, PTFE, PLA, glass and Bakelite, demonstrating an accuracy error below 2%. Next, the probe is used to evaluate the relationship between water content and perm

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6

Prabhakar, Om Prakash, Dhananjay Sahu, and Raj Kumar Sahu. "Triboelectric nanogenerator to harness energy from low-frequency and low-amplitude vibrating sources." Transactions on Energy Systems and Engineering Applications 6, no. 1 (2025): 1–16. https://doi.org/10.32397/tesea.vol6.n1.669.

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Dielectric Elastomer Generator (DEG) stands out as a promising electromechanical device to harness energy from non-conventional sources owing to its ability to convert mechanical energy into electrical power. DEG with no rotating part demonstrates a high performance-to-weight ratio with ease in fabrication and compactness that sets it apart from traditional energy harvesting techniques. Triboelectric nanogenerators (TENGs) belong to a self-powered class of DEG that capitalizes on low-frequency and amplitude mechanical sources. Existing models for predicting the performance of TENGs often assum

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7

Shivashankar, H., Kevin Amith Mathias, Pavankumar R. Sondar, M. H. Shrishail, and S. M. Kulkarni. "Study on low-frequency dielectric behavior of the carbon black/polymer nanocomposite." Journal of Materials Science: Materials in Electronics 32, no. 24 (2021): 28674–86. http://dx.doi.org/10.1007/s10854-021-07242-1.

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AbstractRecently, polymer-based dielectric materials have become one of the key materials to play an essential role in clean energy production, energy transformation, and energy storage applications. The end usage is the energy storage capability because it is a trade-off between dielectric permittivity, dielectric loss, and dissipation factor. Hence, it is of prime importance to study the dielectric properties of polymer materials by adding filler material at a low-frequency range. In the present study, polydimethylsiloxane/carbon black nanocomposites are prepared using the solution cast meth

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8

Chen, Min, Kai Sun, Xuai Wang, and Yanmin Wang. "Communication—Tunable Negative Permittivity of Cobalt and Epoxy Composites at 3 kHz ∼ 1 MHz Frequency Regions." ECS Journal of Solid State Science and Technology 10, no. 12 (2021): 123007. http://dx.doi.org/10.1149/2162-8777/ac3e45.

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Negative permittivity in percolation composites has drawn much attention owing to their potential application. This study set out to explore whether tunable negative permittivity can be realized in metal composites at 3 kHz ∼ 1 MHz frequency regions. When the content of cobalt is 80 wt%, the permittivity turns to negative in the test band. These findings show that the Co conductive network has formed and provides large numbers of free electrons. Meanwhile, the percolation composites with negative permittivity show inductive characteristic. This research supports the idea that tunable low-frequ

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9

Brito, Pedro C., Magdalena Mechetti, and Carlos M. Gotter. "Low Frequency Permittivity and Conductivity of Essential Lemon Oil." Journal of Essential Oil Research 19, no. 3 (2007): 202–5. http://dx.doi.org/10.1080/10412905.2007.9699260.

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10

Boltaev, A. P., F. A. Pudonin, and I. A. Sherstnev. "Low-frequency giant effective permittivity of island metal films." Physics of the Solid State 57, no. 10 (2015): 2099–105. http://dx.doi.org/10.1134/s1063783415100066.

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11

Zhu, Hui, Chong Gao, En Li, Chengyong Yu, Xinjie Xu, and Junwen Pan. "Permittivity measurement of the substrate by using the corrected differential phase method and quick-press test fixture." Review of Scientific Instruments 93, no. 9 (2022): 094709. http://dx.doi.org/10.1063/5.0087780.

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Permittivity is critical for analyzing electromagnetic propagation in the substrate. The differential phase method is desirable to measure the permittivity of the substrate. The actual measurement is usually required to be started at a low frequency to avoid the S21-phase ambiguity problem. To get rid of this problem, the unwrapped S21-phase is calculated accurately at any measurement frequency range. In the classical method of calculating the real permittivity from the effective permittivity, the calculation error increases gradually with increasing frequency, especially in an ultra-wide freq

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12

Bu, Ling, Xiaoming Wu, Xiaohong Wang, and Litian Liu. "Liquid encapsulated electrostatic energy harvester for low-frequency vibrations." Journal of Intelligent Material Systems and Structures 24, no. 1 (2012): 61–69. http://dx.doi.org/10.1177/1045389x12459590.

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This article presents the modeling, fabrication, and testing of liquid encapsulated energy harvester using polyvinylidene fluoride electrets. Unlike harvesters reported in previous literature, this liquid encapsulated energy harvester uses flowing liquid rather than conventional resonating structures to induce variable capacitance and is more suitable for low-frequency applications. Prototypes injected with three types of liquid ( N-methyl-2-pyrrolidone, N, N-dimethylformamide, and glycerin) are tested in horizontal vibration and rotary motion mode, respectively. The results show that N, N-dim

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13

Abdullah A. Hussain, Forat Yasir AlJaberi, and Feras N. Hasoon. "The Conductivity of AC, Loss Tangent, and Relative Permittivity for Composites of PVC Paste/Graphite Electrode Waste." Iraqi Journal of Chemical and Petroleum Engineering 23, no. 1 (2022): 9–14. http://dx.doi.org/10.31699/ijcpe.2022.1.2.

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The behavior of AC conductivity (σac), loss tangent (tan δ), and relative permittivity (ε′) for composites of PVC-P/graphite electrode waste (GEW) was investigated, and a qualitative explanation was provided as a function of PVC-P weight fractions (0, 5, 10, 15, 20, and 25) wt. percent, temperature (30-90) °C, and frequency (100Hz-2MHz). The behaviors of the composites' ac. conductivity and impedance as a frequency function and temperature have been examined. The permittivity was shown to rise with increasing temperature (Tg). The relative permittivity increased as the GEW filler concentration

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14

Javanbakht, Taraneh. "Comparative Analysis of Dielectric Properties of Polyvinyl Alcohol and Polyethylene." Journal of Engineering Sciences 11, no. 1 (2024): C8—С15. http://dx.doi.org/10.21272/jes.2024.11(1).c2.

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The article presents a new comparative analysis of the dielectric properties of polyvinyl alcohol (PVA) and polyethylene (PE) at different temperatures and their other physical properties. The characteristic peaks were observed in the FTIR spectra of the polymers. The amounts of carbon and oxygen on PVA’s surface differed from PE. It was hypothesized that these properties could be affected by the increase in temperature and difference in the chemical structures of the polymers. We investigated the dielectric properties of these polymers between 20 °C and 100 °C. Our results revealed that the d

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15

Stewart, Duff C., Walter L. Anderson, Thomas P. Grover, and Victor F. Labson. "Shallow subsurface mapping by electromagnetic sounding in the 300 kHz to 30 MHz range: Model studies and prototype system assessment." GEOPHYSICS 59, no. 8 (1994): 1201–10. http://dx.doi.org/10.1190/1.1443678.

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A new instrument designed for frequency‐domain sounding in the depth range 0–10 m uses short coil spacings of 5 m or less and a frequency range of 300 kHz to 30 MHz. In this frequency range, both conduction currents (controlled by electrical conductivity) and displacement currents (controlled by dielectric permittivity) are important. Several surface electromagnetic survey systems commonly used (generally with frequencies less than 60 kHz) are unsuitable for detailed investigation of the upper 5 m of the earth or, as with ground‐penetrating radar, are most effective in relatively resistive env

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16

Ding, Baogang, Yunpeng Qu, Kai Sun, and Runhua Fan. "Tailorable epsilon-negative and epsilon-near-zero behavior of TiC/CCTO metacomposites: Low-frequency plasma oscillation." Functional Materials Letters 14, no. 02 (2021): 2150015. http://dx.doi.org/10.1142/s1793604721500156.

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Epsilon-negative ([Formula: see text] < 0) and epsilon-near-zero (ENZ) property was demonstrated in titanium carbide/copper calcium titanate (TiC/CCTO) metacomposites. Benefiting from the moderate concentration of free electrons in TiC filler and its adjustable three-dimensional (3D) networks, weakly negative permittivity ([Formula: see text]200 at 20 MHz) was achieved. Not only that, tailoring the negative permittivity of metacomposites from [Formula: see text]200 to [Formula: see text]2060, [Formula: see text]4200, [Formula: see text]14000 and [Formula: see text]70000 at 20 MHz was realiz

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17

Chen, Le, Zhao Zhan Gu, and Ming Xue Zhang. "Microwave Absorbing Property of Thin Coating in the Broadband Low-Frequency Range." Materials Science Forum 916 (March 2018): 33–37. http://dx.doi.org/10.4028/www.scientific.net/msf.916.33.

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Coatings with flake carbonyl-iron powder as absorber and polyurethane resin as matrix were prepared. The complex permittivity, complex permeability and microwave-absorbing properties were investigated in the frequency range of 2–18 GHz. Both the complex permittivity and permeability of the flaky carbonyl-iron were increased compared to the spherical powders. The minimum reflection loss decreased and the matching frequency shifted to the lower frequency region with increase in the coating thickness. The band width can reach nearly 16GHz as the RL was below than-4 dB with thickness only 1.4 mm.

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18

Hlaváčová, Z. "Low frequency electric properties utilization in agriculture and food treatment." Research in Agricultural Engineering 49, No. 4 (2012): 125–36. http://dx.doi.org/10.17221/4963-rae.

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Determination of electrical properties is utilized in a wide range of disciplines and industries. A brief compendium of agricultural materials and food electrical properties exploitation is presented in this paper. The measurement of electrical conductivity or resistivity can be utilized at investigation of cell membrane properties on microscopic level. Moreover the electrical conductivity have utilization at the salinity of soils and irrigation water determination. Biological material properties are determined from their leachates too. The conductivity measurement are applied for determinatio

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19

Yanushkevich, Viktar F., Dzmitry A. Dauhiala, Aliaksandr L. Adamovich, Siarhei N. Abramenka, and Siarhei V. Kalintsau. "Interaction of two-frequency electromagnetic waves with anisotropic media over hydrocarbon accumulation." Journal of Physics: Conference Series 2373, no. 5 (2022): 052016. http://dx.doi.org/10.1088/1742-6596/2373/5/052016.

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Abstract The article analyzes the interaction of two-frequency electromagnetic waves with anisotropic media over hydrocarbon accumulation. The behavior of the real component έ3 of the dielectric permittivity tensor is investigated. The choice of signal characteristics is based on the use of different electromagnetic wave emission sources with amplitude and frequency ratio coefficients in the modes of powerful low-frequency and high-frequency signals. The dielectric permittivity tensor component έ3 as a function of dielectric permittivity and frequency of sounding signals was analyzed. Sounding

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20

Suganthi, R., S. Padmaja, and S. Jhancy Mary. "Magnetic, Thermal and Electrical Transport Properties of o-Substituted Polyanilines Encapsulated with Fe2O3 Nanoparticles." Asian Journal of Chemistry 32, no. 2 (2019): 265–70. http://dx.doi.org/10.14233/ajchem.2020.22306.

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Poly(2-nitroaniline), poly(2-nitroaniline)-Fe2O3 and poly(2-methylaniline)-Fe2O3 nanocomposites synthesized by in situ chemical oxidative polymerization technique were characterized by XRD, thermal (TGA and DTA) and FTIR & UV-visible spectroscopic techniques. The thermal stability was confirmed by the integral procedural decomposition temperature (IPDT) and oxidation index (OI) calculations. The electrical conductivity and dielectric properties were also investigated. At low frequency region, the dielectric constant decreases with increase in frequency due to electrical relaxation process.

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21

Haq, Tanveerul, Cunjun Ruan, Xingyun Zhang, Shahid Ullah, Ayesha Kosar Fahad, and Wenlong He. "Extremely Sensitive Microwave Sensor for Evaluation of Dielectric Characteristics of Low-Permittivity Materials." Sensors 20, no. 7 (2020): 1916. http://dx.doi.org/10.3390/s20071916.

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In this paper, an extremely sensitive microwave sensor is designed based on a complementary symmetric S shaped resonator (CSSSR) to evaluate dielectric characteristics of low-permittivity material. CSSSR is an artificial structure with strong and enhanced electromagnetic fields, which provides high sensitivity and a new degree of freedom in sensing. Electromagnetic simulation elucidates the effect of real relative permittivity, real relative permeability, dielectric and magnetic loss tangents of the material under test (MUT) on the resonance frequency and notch depth of the sensor. Experiments

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22

Patrick S., Reese, and Akhlesh Lakhtakia. "Low-Frequency Electromagnetic Properties of an Alternating Stack of Thin Uniaxial Dielectric Laminae and Uniaxial Magnetic Laminae." Zeitschrift für Naturforschung A 46, no. 5 (1991): 384–88. http://dx.doi.org/10.1515/zna-1991-0502.

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Abstract Analysis is carried out for an alternating arrangement of laminae which have either uniaxial permittivity or uniaxial permeability dyadics. The unit cell is constructed of two laminae such that the ones with the uniaxial permittivity dyadic alternate with the ones with the uniaxial permeability dyadic through the stack. It is assumed that both dyadics have the same optic axis. The 4-vector method is utilized to construct a characteristic matrix for the two-lamina unit cell. After assuming that each lamina is electrically thin, the properties of an equivalent medium are obtained: both

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23

Ploeg, J. P. M. van der, and M. Mandel. "A low frequency relative permittivity meter for electrically conducting liquids." Measurement Science and Technology 2, no. 4 (1991): 389–95. http://dx.doi.org/10.1088/0957-0233/2/4/019.

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24

Yu, Fei, Jun Wang, Jiafu Wang, et al. "Reflective frequency selective surface based on low-permittivity dielectric metamaterials." Applied Physics Letters 107, no. 21 (2015): 211906. http://dx.doi.org/10.1063/1.4936382.

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25

Nettelblad, B., and G. A. Niklasson. "On the low frequency permittivity of liquid-filled porous media." Solid State Communications 90, no. 3 (1994): 201–4. http://dx.doi.org/10.1016/0038-1098(94)90341-7.

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26

Tsangaris, G. M., and G. C. Psarras. "Permittivity and Loss of Composites of Epoxy Resin and Kevlar Fibres." Advanced Composites Letters 4, no. 4 (1995): 096369359500400. http://dx.doi.org/10.1177/096369359500400405.

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The dielectric behaviour of composites with epoxy resin and kevlar fibres is investigated in a wide range of frequency and temperature. Dielectric permittivity is increasing with filler content and temperature, being always higher in the low frequency range. Dielectric permittivity and loss of the composites is mostly affected by interfacial polarization arising from inhomogeneities at interfaces introduced by the filler.

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27

Li, Yuyan, Huan Ye, Yunpeng Qu, Zongxiang Wang, and Kai Sun. "Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies." ECS Journal of Solid State Science and Technology 11, no. 1 (2022): 013011. http://dx.doi.org/10.1149/2162-8777/ac4bac.

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Three-dimensional (3D) carbon networks composed of graphene (GR) and carbon nanotube (CNT) were constructed in copper calcium titanate (CCTO) in order to realize negative permittivity behavior. The results show that negative permittivity can be obtained at kHz frequencies above percolation threshold when 3D carbon networks are successfully constructed. Negative permittivity originates from the low-frequency plasmonic state which is explained by Drude model. The magnitude of negative permittivity was tuned between 105 and 106 which significantly correlates with concentration of free carriers. M

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28

Mohammad, Syamim Mohammad Basri, Akmal Abdul Rauf Lailatul, Hafizi Ahmad Mohd, Azlinda Ahmad Noor, Z. Arief Yanuar, and Ahmad Noorden Zulkarnain. "Measurement of Dielectric Properties of Low-Density Polyethylene Nanocomposites Using "Sub-Hertz" Dielectric Spectroscopy." TELKOMNIKA Telecommunication, Computing, Electronics and Control 15, no. 2 (2017): 971–76. https://doi.org/10.12928/TELKOMNIKA.v15i2.6153.

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Recently, many studies have been conducted on the dielectric properties of Low-Density Polyethylene (LDPE) nanocomposites and produced different results. However, the composition of LDPE polymer and boron nitride (BN) as nanofiller has neither been well understood nor producing a convenient result. Similarly, the dielectric spectroscopy measured at “sub–hertz” frequency has been of little interest among researchers since it is often influenced by “conduction-like” effect. This research identified the dielectric properties of LDPE nanocomposites filled with hexagon

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29

Żukowski, Paweł, Piotr Gałaszkiewicz, Vitali Bondariev та ін. "Comparative Measurements and Analysis of the Electrical Properties of Nanocomposites TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0)". Materials 15, № 22 (2022): 7908. http://dx.doi.org/10.3390/ma15227908.

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In this paper, the frequency-temperature dependence of the conductivity and dielectric permittivity of nc-TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0) nanocomposites produced by dual-source magnetron sputtering was determined. The films produced are biphasic layers with an excess of amorphous carbon relative to the stoichiometric composition of TixZr1−xC. The matrix was amorphous carbon, and the dispersed phase was carbide nanoparticles. AC measurements were performed in the frequency range of 50 Hz–5 MHz at temperatures from 20 K to 373 K. It was found that both conductivity and permittivity relationships

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30

Cheng, Chuan Bing, Run Hua Fan, Lei Qian, et al. "Multi-Walled Carbon Nanotube-Alumina Nanocomposites with Dielectric Resonance-Induced Negative Permittivity Behavior." Materials Science Forum 898 (June 2017): 1764–69. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1764.

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The multi-walled carbon nanotube/alumina (MWCNTs/Al2O3) nanocomposites embedded with the shortened MWCNTs were prepared by pressureless sintering. The microstructure, conductive behavior and complex permittivity spectra of the composites were investigated. It was found that MWCNTs, which were shortened to low aspect ratio by the controllable acid and ultrasonic treatment, uniformly dispersed in the Al2O3 matrix. A unique dielectric resonance-induced negative permittivity behavior was observed in the composites with high MWCNTs content. The negative magnitude of permittivity was small (~-50) in

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31

Szwagierczak, Dorota, Beata Synkiewicz-Musialska, Jan Kulawik, and Norbert Pałka. "Sintering, Microstructure, and Dielectric Properties of Copper Borates for High Frequency LTCC Applications." Materials 14, no. 14 (2021): 4017. http://dx.doi.org/10.3390/ma14144017.

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New ceramic materials based on two copper borates, CuB2O4 and Cu3B2O6, were prepared via solid state synthesis and sintering, and characterized as promising candidates for low dielectric permittivity substrates for very high frequency circuits. The sintering behavior, composition, microstructure, and dielectric properties of the ceramics were investigated using a heating microscope, X-ray diffractometry, scanning electron microscopy, energy dispersive spectroscopy, and terahertz time domain spectroscopy. The studies revealed a low dielectric permittivity of 5.1–6.7 and low dielectric loss in t

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32

Delfouf, R., N. Bouzit, N. Bourouba, et al. "Dielectric Characterization and Modeling of Composite Materials Based on Epoxy Resin/Black Iron Oxide/Titanates in Several Frequency Ranges." ECS Journal of Solid State Science and Technology 11, no. 7 (2022): 073006. http://dx.doi.org/10.1149/2162-8777/ac7f55.

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The purpose of this article is to study the dielectric dispersion of two different ternary composites made of epoxy resin (RE), black iron oxide (Fe3O4) with one of the two titanates (calcium titanate (CaTiO3) or strontium (SrTiO3)) on several frequency bands. Additionally, the effect of the two titanates and the (Fe3O4) on the permittivity and conductivity of these ternary composites is investigated. These composite materials were characterized using time domain spectroscopy (TDS). The inclusion of the two titanates increased the real permittivity and conductivity of the two composites, shift

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33

Nayak, Hari Chandra, Shivendra Singh Parmar, Rajendra Prasad Kumhar, and Shailendra Rajput. "Modulation in Electric Conduction of PVK and Ferrocene-Doped PVK Thin Films." Electronic Materials 3, no. 1 (2022): 53–62. http://dx.doi.org/10.3390/electronicmat3010005.

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In this article, the dielectric properties of poly (9-vinylcarbazole) (PVK) and ferrocene-doped PVK thin films are studied. The thin films were grown by the isothermal solution casting technique. Dielectric properties of grown films were studied as function of ferrocene concentration, frequency, and temperature. The relative permittivity (ε′) is increased with increasing ferrocene percentage (~1%) due to the free charge carriers. The relative permittivity decreases for higher ferrocene percentage (~2%). However, the relative permittivity of PVK and ferrocene-doped PVK samples remains almost co

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34

Wawrzała, P., and R. Skulski. "The Dispersion of Strong Field Dielectric Permittivity in (1-x)PMN-(x)PT Ceramics." Archives of Metallurgy and Materials 56, no. 4 (2011): 1199–203. http://dx.doi.org/10.2478/v10172-011-0135-4.

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The Dispersion of Strong Field Dielectric Permittivity in (1-x)PMN-(x)PT CeramicsWe propose the method of analysis of the dielectric permittivity measured in very strong electric fields. The method is based on the numeric calculations of derivative fromP - Ehysteresis loop. Such investigations have been performed for PMN-PT ceramics at various temperatures and frequencies. As a result we analyze the low frequency dispersion of the strong field dielectric permittivity.

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35

Nad', F., P. Monceau, and K. Bechgaard. "Low-frequency permittivity of spin-density wave in (TMTSF)2PF6 at low temperatures." Solid State Communications 95, no. 10 (1995): 655–60. http://dx.doi.org/10.1016/0038-1098(95)00360-6.

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36

Vural, Mert, Benjamin Crowgey, Leo C. Kempel, and Peter Kofinas. "Nanostructured flexible magneto-dielectrics for radio frequency applications." J. Mater. Chem. C 2, no. 4 (2014): 756–63. http://dx.doi.org/10.1039/c3tc32113d.

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37

Liu, Lai Jun, and Hui Qing Fan. "Microstructure and Electrical Properties of Calcium Copper Titanate Ceramics." Materials Science Forum 561-565 (October 2007): 551–55. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.551.

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The effect of stoichiometry, i.e. Ca/Cu ratios (CaCu3xTi4O12, x = 0.8, 0.9, 1.0, 1.1 and 1.2) on the microstructure and electrical properties was investigated. The grain sizes of CaCu3xTi4O12 composition increased sharply with the increase of copper, from ~1 μm with x = 0.8 to ~50 μm with x = 1.2. The real part of dielectric permittivity changed dramatically, the pellet with x = 1.0 had the highest dielectric permittivity ~160, 000 at 1 kHz. Furthermore, the dielectric permittivity of all pellets was impressively large values (between 10, 000 to 1, 000,000 at 100 Hz) and was nearly constant ov

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38

Domenzain, Diego, John Bradford, and Jodi Mead. "Joint inversion of full-waveform ground-penetrating radar and electrical resistivity data — Part 2: Enhancing low frequencies with the envelope transform and cross gradients." GEOPHYSICS 85, no. 6 (2020): H115—H132. http://dx.doi.org/10.1190/geo2019-0755.1.

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Recovering material properties of the subsurface using ground-penetrating radar (GPR) data of finite bandwidth with missing low frequencies and in the presence of strong attenuation is a challenging problem. We have adopted three nonlinear inverse methods for recovering electrical conductivity and permittivity of the subsurface by joining GPR multioffset and electrical resistivity (ER) data acquired at the surface. All of the methods use ER data to constrain the low spatial frequency of the conductivity solution. The first method uses the envelope of the GPR data to exploit low-frequency conte

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Bobrov, P. P., T. A. Belyaeva, E. S. Kroshka, and O. V. Rodionova. "RELATIONSHIP OF LOW-FREQUENCY DIELECTRIC PERMITTIVITY WITH THE CONDUCTIVITY OF LOW-SALTED SAND SAMPLES." RADIO COMMUNICATION TECHNOLOGY, no. 46 (September 30, 2020): 85–94. http://dx.doi.org/10.33286/2075-8693-2020-46-85-94.

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The results of experimental measurements of the complex dielectric permittivity (CDP) of sand and powders of quartz granules saturated with a saline solution with a conductivity from 0 to 0.77 S/m are presented. The measurements were carried out at the frequencies from 1 kHz to 5 GHz. It is shown that in the frequency range from 10 kHz to 100 MHz, the dielectric characteristics can be modeled by three relaxation processes. The parameters of these processes are described by the Debye and Cole-Cole formulas. For two low-frequency processes, regression equations that relate the parameters of the

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Qu, Yunpeng, Guohua Fan, and Yao Liu. "Tunable negative permittivity in Ti3SiC2 MAX phase/Polymethyl methacrylate metacomposites at radio-frequency region." Functional Materials Letters 12, no. 01 (2019): 1850101. http://dx.doi.org/10.1142/s1793604718501011.

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Metacomposites with negative permittivity have triggered tremendous fundamental and practical attention in recent years. In this paper, Ti3SiC2 MAX phase/Polymethyl methacrylate (PMMA) metacomposites with different Ti3SiC2 content were prepared. Weakly negative permittivity value (between [Formula: see text] and 0) was observed near percolation (Ti3SiC2 content of 60[Formula: see text]wt.%), attributing to moderate carrier concentration in Ti3SiC2 networks, and negative permittivity was tuned by tailoring conductive Ti3SiC2 networks. AC conductivity spectra and negative permittivity spectra of

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41

Malyshkina O.V., Guseva O.S., Mitchenko A. S., and Kislova I. L. "Effect of SrTiO3, KTaO-=SUB=-3-=/SUB=-, and LiTaO-=SUB=-3-=/SUB=- modifier on the dielectric properties of Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=- ceramics." Physics of the Solid State 64, no. 7 (2022): 813. http://dx.doi.org/10.21883/pss.2022.07.54585.313.

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Using the method of solid-phase synthesis, we obtained ceramic samples with a structure like tetragonal tungsten bronzes, pure Ca0.3Ba0.7Nb2O6 (CBN30) and with modifying additives SrTiO3, KTaO3, or LiTaO3. The dispersion of the permittivity in the frequency range from 1 Hz to 10 MHz, the temperature dependences of the permittivity (in the given frequency range) and the pyroelectric coefficient are studied. It is shown that if the introduction of the LiTaO3 impurity into the composition of CBN30 destabilizes the dielectric characteristics at frequencies above 100 kHz, then the SrTiO3 impurity i

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González Riaño, Oscar Julian, Brayan Andres Vega Valencia, and César Alexander Chacón Cardona. "Permittivity experimental determination as a frequency function." Tecnura 24, no. 64 (2020): 34–47. http://dx.doi.org/10.14483/22487638.16533.

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Objective: To determine the behavior of dielectric permittivity of class II ceramic capacitor in function of frequency up to 10MHz. Context: in telecommunications and high frequency circuits is necessary to take into account the diminishing of permittivity on dielectrics of ceramic capacitors with the frequency growth, two quantitative methods are proposed to determine this behavior. Method: First, the impedance meter bridge FLUKE PM5306 was used in the frequency range from 10^2 Hz to 10^5 Hz; and second, a novel low-cost electronic circuit for the frequency range between 10^4 Hz t

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Zukowski, Pawel, Przemyslaw Rogalski, Konrad Kierczynski, and Tomasz N. Koltunowicz. "Precise Measurements of the Temperature Influence on the Complex Permittivity of Power Transformers Moistened Paper-Oil Insulation." Energies 14, no. 18 (2021): 5802. http://dx.doi.org/10.3390/en14185802.

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The reference characteristics of complex permittivity of the transformers insulation solid component were determined for use in the precise diagnostics of the power transformers insulation state. The solid component is a composite of cellulose, insulating oil and water nanoparticles. Measurements were made in the frequency range from 10−4 Hz to 5000 Hz at temperatures from 293.15 to 333.15 K. Uncertainty of temperature measurements was less than ±0.01 K. Pressboard impregnated with insulating oil with a water content of (5.0 ± 0.2) by weight moistened in a manner maximally similar to the moist

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Makarov, V. V., and A. B. Sherman. "Low-frequency dispersion of the negative dielectric permittivity in C70 films." Physics of the Solid State 44, no. 11 (2002): 2200–2203. http://dx.doi.org/10.1134/1.1521479.

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Fuks, L. F., M. Cheney, D. Isaacson, D. G. Gisser, and J. C. Newell. "Detection and imaging of electric conductivity and permittivity at low frequency." IEEE Transactions on Biomedical Engineering 38, no. 11 (1991): 1106–10. http://dx.doi.org/10.1109/10.99074.

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Jha, Kumud Ranjan, and G. Singh. "Effect of low dielectric permittivity on microstrip antenna at terahertz frequency." Optik 124, no. 22 (2013): 5777–80. http://dx.doi.org/10.1016/j.ijleo.2013.04.061.

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Qiu, Rong, Yuanyuan Ni, Jun Li, et al. "Ni nanocrystals tuning low-frequency colossal permittivity of epitaxial BaTiO3 matrix." Journal of Alloys and Compounds 801 (September 2019): 460–64. http://dx.doi.org/10.1016/j.jallcom.2019.06.154.

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Nad', F., P. Monceau, and J. M. Fabre. "Low frequency dielectric permittivity of quasi-one-dimensional conductor (TMTTF) Br." European Physical Journal B 3, no. 3 (1998): 301–6. http://dx.doi.org/10.1007/s100510050316.

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Ouhassan, Youssef, Seddik Bri, Boubakraoui el, and Mohamed Habibi. "Dielectric properties of ceramic composite materials based on alumina reinforced by titanium carbide." FME Transactions 48, no. 4 (2020): 908–13. http://dx.doi.org/10.5937/fme2004908o.

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The aim of this research work is to study the dielectric and microwave properties of the three ceramic composites Al2O3-TiC, Al2O3-0.3TiC and Al2O3-0.7TiC. The results obtained show that the effective permittivity increases with the increase in the filling rate of titanium carbide TiC inclusions and their contrasts. As for the classical mixing laws, they make it possible to estimate permittivity for low volume fractions and low contrasts. The values of the real part of the complex permittivity decrease with frequency increase in the two bands X and Ku, while the imaginary part is approximately

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Fuscaldo, Walter, Francesco Maita, Luca Maiolo, Romeo Beccherelli, and Dimitrios C. Zografopoulos. "Broadband Dielectric Characterization of High-Permittivity Rogers Substrates via Terahertz Time-Domain Spectroscopy in Reflection Mode." Applied Sciences 12, no. 16 (2022): 8259. http://dx.doi.org/10.3390/app12168259.

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We report the dielectric characterization of three commercially available, high-permittivity Rogers laminates in the sub-terahertz range, by means of terahertz time-domain spectroscopy measurements in reflection mode. A transmission-line model is developed to obtain the reflectance spectra as a function of the frequency-dispersive complex relative permittivity of the substrates. The latter is fitted through optimization to a single Lorentzian term, which is shown to accurately reproduce the measured reflectance spectra. The substrates RO3010 and RT/duroid 6010.2LM exhibit significant frequency

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