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Статті в журналах з теми "Electrical conductivity mechanism"

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Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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1

Paraskeva, C., A. Kazakopoulos, K. Chrissafis, and O. Kalogirou. "Study of LiMgVO4 electrical conductivity mechanism." Journal of Alloys and Compounds 489, no. 2 (January 2010): 714–18. http://dx.doi.org/10.1016/j.jallcom.2009.09.159.

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2

Orita, Masahiro, Hiroaki Tanji, Masataka Mizuno, Hirohiko Adachi, and Isao Tanaka. "Mechanism of electrical conductivity of transparentInGaZnO4." Physical Review B 61, no. 3 (January 15, 2000): 1811–16. http://dx.doi.org/10.1103/physrevb.61.1811.

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3

Ehinger, K., S. Summerfield, and S. Roth. "Electrical conductivity of polyacetylene: nonsolitonic mechanism." Colloid & Polymer Science 263, no. 9 (September 1985): 714–19. http://dx.doi.org/10.1007/bf01422852.

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4

Ragimov, S. S., A. A. Saddinova, and A. I. Aliyeva. "Mechanism of Electrical Conductivity and Thermal Conductivity in AgSbSe2." Russian Physics Journal 62, no. 6 (October 2019): 1077–81. http://dx.doi.org/10.1007/s11182-019-01817-6.

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5

Gebru, Mulugeta Habte. "Electrical and thermal conductivity of heavily doped n-type silicon." European Physical Journal Applied Physics 90, no. 1 (April 2020): 10102. http://dx.doi.org/10.1051/epjap/2020190332.

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In this paper electrical and thermal conductivity coefficients of heavily doped n-Silicon have been derived based on parabolic and modified density of states having band tails. The derivation uses Boltzmann transport equation with relaxation time arising from ionized impurity scattering mechanism as a dominant scattering mechanism compared to the phonon scattering mechanism where the calculations are made at room temperature. Note that semi-classical and quantum mechanics treatments are employed during discussion of scattering mechanisms and calculation of transport coefficients for parabolic and modified density of states having band tails considerations. There is significant variation of electrical and thermal conductivity as well as Weidman-Franz ratio as much as 30%, 101.86%, and 0.66% respectively.

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6

Ragimov, S. S., A. A. Saddinova, and A. I. Aliyeva. "The mechanism of electrical conductivity and thermal conductivity of AgSbSe2." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 6 (June 1, 2019): 139–43. http://dx.doi.org/10.17223/00213411/62/6/139.

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7

Jaccard, C. "MECHANISM OF THE ELECTRICAL CONDUCTIVITY IN ICE." Annals of the New York Academy of Sciences 125, no. 2 (December 16, 2006): 390–400. http://dx.doi.org/10.1111/j.1749-6632.1965.tb45405.x.

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8

Belousov, A. I., and E. M. Bushueva. "Mechanism of electrical conductivity of jet fuels." Chemistry and Technology of Fuels and Oils 21, no. 7 (July 1985): 375–80. http://dx.doi.org/10.1007/bf00723848.

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9

Ahmadov, G. M., H. B. Ibrahimov, and M. A. Jafarov. "Influence of external factors on the electrical conductivity of Bi2Te2.5Se0.5." Chalcogenide Letters 19, no. 1 (January 2022): 55–60. http://dx.doi.org/10.15251/cl.2022.191.55.

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The mechanism of intrinsic and impurity electrical conductivity of semiconductors based on Bi2Te2.5Se0.5 has been elucidated. The nature and reasons for the dependence of electrical conductivity on various external influences are considered. In this case, the temperature dependence of electrical conductivity, light absorption and photoconductivity of Bi2Te2.5Se0.5 were used as external influences. And also the influence of the electric field was studied and it was found that in this case the value of the critical energy is 107V/m.

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10

Казанин, М. М., В. В. Каминский та М. А. Гревцев. "Эффект Пула-Френкеля в поликристаллическом сульфиде европия". Физика и техника полупроводников 53, № 7 (2019): 887. http://dx.doi.org/10.21883/ftp.2019.07.47862.9075.

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AbstractThe field and temperature dependences of the electrical conductivity of europium sulfide are studied in the temperature range 160–430 K. It is found that the electrical conductivity increases in strong electric fields of up to 2 × 10^4 V/cm by the Poole–Frenkel mechanism.

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11

Abdel-Wahab, F., A. Merazga, and A. A. Montaser. "Electrical Conductivity Mechanism in Unconventional Lead Vanadate Glasses." Journal of Low Temperature Physics 186, no. 5-6 (December 9, 2016): 372–84. http://dx.doi.org/10.1007/s10909-016-1724-4.

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12

Alvarez, Santiago, Juan Novoa, and Fernando Mota. "The mechanism of electrical conductivity along polyhalide chains." Chemical Physics Letters 132, no. 6 (December 1986): 531–34. http://dx.doi.org/10.1016/0009-2614(86)87118-4.

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13

Ries, H. R., W. L. Harries, S. A. T. Long, and E. R. Long. "Mechanism of electrical conductivity in an irradiated polyimide." Journal of Physics and Chemistry of Solids 50, no. 7 (January 1989): 735–38. http://dx.doi.org/10.1016/0022-3697(89)90013-9.

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14

Xie, Juan, Menghe Miao, and Yongtang Jia. "Mechanism of Electrical Conductivity in Metallic Fiber-Based Yarns." Autex Research Journal 20, no. 1 (March 1, 2020): 63–68. http://dx.doi.org/10.2478/aut-2019-0008.

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AbstractWe explore the conductive mechanism of yarns made from metallic fibers and/or traditional textile fibers. It has been proposed for the first time, to our knowledge, that probe span length plays a great role in the conductivity of metallic fiber-based yarns, which is determined by the probability and number of conductive fibers appearing on a cross section and their connecting on two neighboring sections in a yarn’s longitudinal direction. The results demonstrate that yarn conductivity is negatively influenced to a large extent by its length when metallic fibers are blended with other nonconductive materials, which is beyond the scope of conductivity theory for metal conductors. In addition, wicking and wetting performances, which interfere with fiber distribution and conductive paths between fibers, have been shown to have a negative influence on the conductivity of metallic fiber-based yarns with various structures and composed of different fiber materials. Such dependence of the conductivity on the probe span length, as well as on the moisture from air and human body, should get attention during investigation of the conductivity of metallic fiber-based composites in use, especially in cases in which conductive yarns are fabricated into flexible circuit boards, antennas, textile electrodes, and sensors.

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15

Feng, Ya Ning, Rong Yang, Li Ling Ge, Bai Ling Jiang, Masaki Tanemura, and Lei Miao. "Research on Mechanism of Electrical Transport of Carbon Aerogels." Advanced Materials Research 160-162 (November 2010): 1378–82. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1378.

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To have a fundamental understanding on the principle of carbon aerogels when it is used as electrode materials in power battery, the effects of density and structural properties on the electrical conductivity of carbon aerogels was investigated in this paper. Carbon aerogels with different density were prepared via adjusting the chemical conditions of the primary solution. The morphology of carbon aerogels were observed by field emission scanning electron microscopy (FE-SEM). Experimental results show that the electrical conductivity of carbon aerogels is ranged from 10-6 Ω/cm to 10 Ω/cm, and that not only the density but also the carbon particle size and porosity of carbon aerogels effect the transport property greatly. With the increasing of the density the electrical conductivity of carbon aerogels increases. This indicates that larger particle size and lower porosity of the nano-structure lead to higher conductivity.

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16

Gudkov, S. I., A. V. Solnyshkin, D. A. Kiselev, and A. N. Belov. "Electrical conductivity of lithium tantalate thin film." Cerâmica 66, no. 379 (September 2020): 291–96. http://dx.doi.org/10.1590/0366-69132020663792885.

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Abstract The electrical conductivity of lithium tantalate thin film on the silicon substrate was studied. The film structure was prepared by RF magnetron sputtering. In general, the current-voltage characteristics were asymmetric and similar to that of a diode. The current-voltage characteristics had several sections associated with various transport mechanisms of current carriers. The main conductivity mechanism was related to the space-charge-limited current. The current-voltage characteristics showed that there was a mismatch between the forward and backward runs. One of the reasons for such behavior is a space charge accumulation due to charge carriers which were injected from the electrode and did not relax.

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17

Onlaor, Korakot, S. Khantham, B. Tunhoo, T. Thiwawong, and J. Nukeaw. "Charge Transfer Mechanism in Organic Memory Device." Advanced Materials Research 93-94 (January 2010): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.235.

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In this paper, the conduction mechanism in organic bistable memory device was investigated by both experimental and theoretical method. The current voltage (J-V) characteristics showed the electrical bistable properties between an initial low-conductivity state and a high-conductivity state upon application of an external electric field at room temperature. The current transition exhibited a very narrow voltage range that causes an abrupt increase of current. The on-state and the off-state were proposed by space-charge-limited current and thermionic emission model, respectively. That supported by the experimental data to explained the charge transfer mechanism in organic memory device.

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18

Нифтиев, Н. Н., Ф. М. Мамедов та М. Б. Мурадов. "Электропроводность монокристаллов MnGaInSе-=SUB=-4-=/SUB=- на переменном токе". Письма в журнал технической физики 46, № 11 (2020): 19. http://dx.doi.org/10.21883/pjtf.2020.11.49493.18241.

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The results of studying the frequency and temperature dependences of the electrical conductivity of MnGaInSe4 single crystals on alternating electric current are presented. It was found that in the temperature range of 295.5–360 K at frequencies of 2•104–106 Hz, the regularity σ ∼ fS (0.1≤ s≤1.0) holds for electrical conductivity. It is shown that in the MnGaInSe4 single crystal the frequency dependence of electrical conductivity can be explained using the multiplet model, and the conductivity in these single crystals is characterized by a band-hop mechanism. Based on the dependences log σ ∼ 103/T, the activation energies are determined.

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19

CHANDRA, K. P., R. N. GUPTA, and K. PRASAD. "ELECTRIC MODULUS AND DIELECTRIC STUDIES OF ALIZARIN DOPED ANTHRAQUINONE." International Journal of Modern Physics B 22, no. 14 (June 10, 2008): 2321–31. http://dx.doi.org/10.1142/s0217979208039411.

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The electrical properties of alizarin doped anthraquinone were investigated using a complex impedance spectroscopy technique. Dielectric study revealed a phase transition from the semiconducting to the conducting state at 53°C. The dielectric relaxation was found to be of non-Debye type. Evidence of temperature-dependent electrical relaxation phenomena as well as a positive temperature coefficient of conductivity character were observed in the sample. The frequency dependence of AC conductivity data followed a power law. Electric modulus as well as AC conductivity analyses indicated the possibility of a hopping mechanism for electrical conduction in the system. The activation energy and minimum hopping distance were estimated from the AC conductivity data.

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20

Lee, Shi-Woo, Ji-Haeng Yu, and Sang-Kuk Woo. "Dual Phase Conductive CO2Membranes: Mechanism, Microstructure, and Electrical Conductivity." Journal of the Korean Ceramic Society 44, no. 8 (August 31, 2007): 424–29. http://dx.doi.org/10.4191/kcers.2007.44.8.424.

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21

Amnerkar, R. H., R. N. Ghodpage, N. D. Narkhede, and S. H. Dhawankar. "STUDY OF ELECTRICAL CONDUCTIVITY AND CONDUCTION MECHANISM OF CuNiTiO4." Material Science Research India 3, no. 2 (December 20, 2006): 195–96. http://dx.doi.org/10.13005/msri/030216.

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22

Kamoun, S., F. Hlel, and M. Gargouri. "Electrical properties and conductivity mechanism of LiCuFe2(VO4)3." Ionics 20, no. 8 (February 4, 2014): 1103–10. http://dx.doi.org/10.1007/s11581-014-1075-6.

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23

Hona, Ram Krishna, Gurjot S. Dhaliwal, and Rajesh Thapa. "Investigation of Grain, Grain Boundary, and Interface Contributions on the Impedance of Ca2FeO5." Applied Sciences 12, no. 6 (March 13, 2022): 2930. http://dx.doi.org/10.3390/app12062930.

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Conductivity properties such as the impedance contributions of grain, grain boundary, and electrode–material interface of brownmillerite-type Ca2Fe2O5 are studied using alternate current (AC) impedance at different temperatures over a wide range of frequencies. The compound was synthesized at 1000 °C by a solid-state reaction. Powder X-ray diffraction confirmed the pure and single-phase formation. The correlation of the electrical properties with the microstructure of the compound was studied by an AC impedance spectroscopic technique at different temperatures (25–300 °C), which demonstrated the contribution of both the grain (bulk) and grain boundary to the impedance. The frequency-dependent electrical conductivity was used to study the conductivity mechanism. The electric impedance and the frequency at different temperatures supported the suggested conduction mechanism.

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24

Krontiras, Christoforos A., Michael N. Pisanias, John A. Mikroyannidis, and Stavroula N. Georga. "Electrical Conductivity of Pyrolysed Polyamides Derived from 1,4-Bis(2-Cyano-2-Carboxyvinyl)Benzene and Various Aromatic Diamines." High Performance Polymers 9, no. 2 (June 1997): 189–203. http://dx.doi.org/10.1088/0954-0083/9/2/010.

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The electrical conductivity of three homopolyamides, synthesized from aromatic diamines and identified as PAM, PAP and PAS, was investigated as a function of temperature in the range 100–700 K, following pyrolysis for 24 h in an atmosphere of N2 at temperatures of 550, 700, 800 and 850 °C. X-ray profiles were recorded for the three polymers before and following pyrolysis. The non-heat-treated polymers are amorphous whereas a certain degree of crystallinity is observed following pyrolysis. The observed conductivity covered a range from 10−9 to 10 S cm−1 depending on the polymer and the pyrolysis temperature. The results suggest that the conductivity is thermally activated and is due to two mechanisms, the intra-chain conductivity and the inter-chain conductivity. The activation energy for the intra-chain mechanism varies from 0.36 to 0.01 eV and for the inter-chain mechanism the activation energy varies from 2.76 to 0.08 eV, depending on the pyrolysis temperature for both mechanisms.

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25

Prasad, N. V., G. Prasad, T. Bhimasankaram, S. V. Suryanarayana, and G. S. Kumar. "Synthesis and Electrical Properties of SmBi5Fe2Ti3O18." Modern Physics Letters B 12, no. 10 (April 30, 1998): 371–81. http://dx.doi.org/10.1142/s0217984998000469.

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SmBi 5 Fe 2 Ti 3 O 18, a five layered bismuth oxide compound is synthesized using a solid-state double sintering method. DC conductivity, impedance, and AC conductivity are studied in the temperature range 30–500°C and frequency range 1 kHz–1 MHz. Complex impedance plots are used to separate grain and grain boundary contributions to electrical impedance. Activation energy for DC conductivity was found to be around 1.0 eV. The results are analyzed to understand the conductivity mechanism.

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26

Wei, Xin Lao, and Yu Long LI. "A Measuring Method of Liquid Food Conductivity Based on Pulse Response Measurement Method." Advanced Materials Research 981 (July 2014): 628–31. http://dx.doi.org/10.4028/www.scientific.net/amr.981.628.

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The food conductivity is one of impact factors on pulsed electric field sterilization. Abnormal breakdown of high conductivity liquid is also one of the bottlenecks in pulsed electric field sterilization technology. The conductivity of liquid food should be accurate calculated for searching the mechanism of abnormal breakdown deeply. An accurate measuring method of conductivity of liquid food is proposed based on pulse response method. Conductivity can be calculated by data recorded from oscilloscope with electrical pulse treating on the conductance cell. This method can decrease the impact of stray capacitance and polarization phenomenon on measured results.

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27

Kim, Sang-il, and Hyun-Sik Kim. "Calculated Electric Transport Properties of Thermoelectric Semiconductors Under Different Carrier Scattering Mechanisms." Korean Journal of Metals and Materials 59, no. 2 (February 5, 2021): 127–34. http://dx.doi.org/10.3365/kjmm.2021.59.2.127.

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The widespread application of thermoelectric devices in cooling and waste heat recovery systems will be achieved when materials achieve high thermoelectric performance. However, improving thermoelectric performance is not straightforward because the Seebeck coefficient and electrical conductivity of the materials have opposite trends with varying carrier concentration. Here, we demonstrate that carrier scattering mechanism engineering can improve the power factor, which is the Seebeck coefficient squared multiplied by electrical conductivity, by significantly improving the electrical conductivity with a decreased Seebeck coefficient. The effect of engineering the carrier scattering mechanism was evaluated by comparing the band parameters (density-of-states effective mass, non-degenerate mobility) of Te-doped and Te, transition metal co-doped <i>n</i>-type Mg2Sb3 fitted via the single parabolic band model under different carrier scattering mechanisms. Previously, it was reported that co-doping transition metal with Te only changed the carrier scattering mechanism from ionized impurity scattering to mixed scattering between ionized impurities and acoustic phonons, compared to Te-doped samples. The approximately three times enhancement in the power factor of Te, transition metal co-doped samples reported in the literature have all been attributed to a change in the scattering mechanism. However, here it is demonstrated that Te, transition metal co-doping also increased the density-of-states effective mass. Here, the impact of the scattering mechanism change on the electric transport properties of <i>n</i>-type Mg2Sb3 without an effective mass increase was studied. Even without the effective mass increase, carrier scattering mechanism engineering improved the power factor, and its effect was maximized by appropriate carrier concentration tuning.

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28

Nasri, S., A. Oueslati, I. Chaabane, and M. Gargouri. "AC conductivity, electric modulus analysis and electrical conduction mechanism of RbFeP2O7 ceramic compound." Ceramics International 42, no. 12 (September 2016): 14041–48. http://dx.doi.org/10.1016/j.ceramint.2016.06.011.

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29

Zeller, Florian, Nirdesh Ojha, Claas Müller, and Holger Reinecke. "Electrical Discharge Milling of Silicon Carbide with Different Electrical Conductivity." Key Engineering Materials 611-612 (May 2014): 677–84. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.677.

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Silicon Carbide is a ceramic material with extraordinary properties. Not only does it excel in mechanical properties, such as very high hardness and flexural strength, but also shows excellent thermal properties with a low thermal expansion and operating temperatures above 1000°C. These properties predestine silicon carbide for applications in harsh environments. Structuring silicon carbide in the sintered state with conventional methods is not feasible due to its hardness. A non-conventional process to structure materials independent of their mechanical properties is electrical discharge machining (EDM). A certain conductivity is however required for this process. To fulfill this requirement, the method of an assisting electrode (AE) is used. During the process, an intrinsic AE is generated from the cracked dielectric oil and deposited on the ceramic surface. The process can therefore continue even after the applied AE has been penetrated. For a deeper understanding of the present removal mechanism EDM of non-conducting ceramics, especially in the area of micro EDM, an investigation of the influence of conductivity is necessary. Therefore three silicon carbide ceramics with different electrical conductivity (S-SiC: 1 10-7S/cm; LR-SiC: 10 S/cm; HO-SiC: 5 10-9S/cm) have been microstructured and analysed. It is found that the conductivity of the silicon carbide materials has no influence on the machinability, all samples can be microstructured. The microsections of the machined samples show that the near-surface structure of the SiC materials is not negatively influenced by the EDM process. The analysis of the surface revealed indications that for S-SiC and for HO-SiC, thermal spalling is the present removal mechanism. The LR-SiC surface shows melting structures. The material removal rate of LR-SiC is 8 × 10-3mm3/min, whereas the material removal rate of the S-SiC and the HO-SiC ranges at 3 × 10-3mm3/min. The high MRR of the LR-SiC indicates a removal mechanism analog to Silicon infiltrated Silicon carbide (SiSiC), with removal of a conductive phase.

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30

Deepika and Hukum Singh. "Electrical conduction mechanism in films of Se80−xTe20Bix (0 ≤ x ≤ 12) glassy alloys." Canadian Journal of Physics 97, no. 2 (February 2019): 222–26. http://dx.doi.org/10.1139/cjp-2017-0973.

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Анотація:

This paper reports the study of DC electrical conductivity of films of Se80−xTe20Bix (0 ≤ x ≤ 12) glasses prepared using physical vapor deposition method. The films were structurally characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM results indicate the formation of nanorods within the films. The electrical conductivity of the samples was studied using Keithley electrometer in the temperature range 303–373 K. The results show that conduction in these samples takes place via thermally assisted tunnelling and variable range hopping of charge carriers corresponding to higher and lower temperature ranges, respectively. Further, it was found that the conductivity increases with increase in Bi concentration in Se–Te system. This has been explained on the basis of chemically ordered network model. It was also found that nanorod formation improves the electrical conductivity of Se–Te–Bi system compared to bulk Se–Te–Bi system.

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31

Grebenkina, V. G., D. E. Dyshel, M. D. Smolin, and V. N. Fedorov. "Electrical properties and mechanism of electrical conductivity of ruthenium dioxide-base thick films." Soviet Powder Metallurgy and Metal Ceramics 29, no. 5 (May 1990): 396–99. http://dx.doi.org/10.1007/bf00844963.

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32

Suchanicz, J., K. Kluczewska-Chmielarz, D. Sitko, and G. Jagło. "Electrical transport in lead-free Na0.5Bi0.5TiO3 ceramics." Journal of Advanced Ceramics 10, no. 1 (January 18, 2021): 152–65. http://dx.doi.org/10.1007/s40145-020-0430-5.

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Анотація:

AbstractLead-free Na0.5Bi0.5TiO3 (NBT) ceramics were prepared via a conventional oxide-mixed sintering route and their electrical transport properties were investigated. Direct current (DC, σDC) and alternating current (AC, σAC) electrical conductivity values, polarization current (first measurements) and depolarization current, current–voltage (I–U) characteristics (first measurements), and the Seebeck coefficient (α) were determined under various conditions. The mechanism of depolarization and the electrical conductivity phenomena observed for the investigated samples were found to be typical. For low voltages, the I–U characteristics were in good agreement with Ohm’s law; for higher voltages, the observed dependences were I–U2, I–U4, and then I–U6. The low-frequency σAC followed the formula σAC–ωs (ω is the angular frequency and s is the frequency exponent). The exponent s was equal to 0.18–0.77 and 0.73–0.99 in the low- and high-frequency regions, respectively, and decreased with temperature increasing. It was shown that conduction mechanisms involved the hopping of charge carriers at low temperatures, small polarons at intermediate temperatures, and oxygen vacancies at high temperatures. Based on AC conductivity data, the density of states at the Fermi-level, and the minimum hopping length were estimated. Electrical conduction was found to undergo p–n–p transitions with increasing temperature. These transitions occurred at depolarization temperature Td, 280 ℃, and temperature of the maximum of electric permittivity Tm is as typical of NBT materials.

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33

Potses, Tatiana, Vladimir Novikov, Kirill Sergeev, and Sergey Leonovich. "Electrical conductivity of cement mortar with the addition of graphene." MATEC Web of Conferences 350 (2021): 00007. http://dx.doi.org/10.1051/matecconf/202135000007.

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Анотація:

With the development of technological innovations in the field of construction, increasing the efficiency of energy-saving materials used, more and more attention is paid to electrically conductive materials. Electrical conductivity studies were carried out on samples of concrete with graphene addition to obtain the current–voltage characteristics of the material. In order to identify the mechanism of the effects of different concentrations of graphene on electrical conductivity, a series of samples with different concentrations of graphene was made. As a result of the research, it was found that the dependence: the resistivity of the materialthe concentration is percolation, the concentration of graphene in the amount of 8% of the mass of cement is the percolation threshold.

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34

Baudour, J. L., H. Elbadraoui, F. Bouree, A. Rousset, R. Legros, and B. Gillot. "Cation valence distribution and electrical conductivity mechanism in nickel manganites." Acta Crystallographica Section A Foundations of Crystallography 49, s1 (August 21, 1993): c294. http://dx.doi.org/10.1107/s0108767378091795.

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35

Mofakham, S., M. Mazaheri та M. Akhavan. "Two-dimensional mechanism of electrical conductivity in Gd1−xCexBa2Cu3O7−δ". Journal of Physics: Condensed Matter 20, № 34 (6 серпня 2008): 345221. http://dx.doi.org/10.1088/0953-8984/20/34/345221.

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36

Liu, Caixia, Can Wu, Chao Hao, Ping Liu, Xiaohui Guo, Yugang Zhang, and Ying Huang. "Electrical conductivity transformation mechanism of GNPs/CB/SR nanocomposite foams." Journal of Applied Polymer Science 135, no. 11 (November 16, 2017): 45996. http://dx.doi.org/10.1002/app.45996.

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37

Lazarenko, A., L. Vovchenko, Y. Prylutskyy, L. Matzuy, U. Ritter, and P. Scharff. "Mechanism of thermal and electrical conductivity in polymer-nanocarbon composites." Materialwissenschaft und Werkstofftechnik 40, no. 4 (April 2009): 268–72. http://dx.doi.org/10.1002/mawe.200900439.

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38

Di Noto, Vito, Keti Vezzù, Gioele Pagot, and Enrico Negro. "(Keynote) Electrical Response and Conductivity Mechanism in Ion-Exchange Membranes." ECS Meeting Abstracts MA2020-01, no. 51 (May 1, 2020): 2823. http://dx.doi.org/10.1149/ma2020-01512823mtgabs.

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39

Lan, Rui, Rie Endo, Masashi Kuwahara, Yoshinao Kobayashi, and Masahiro Susa. "Electrical and Thermal Conductivity and Conduction Mechanism of Ge2Sb2Te5 Alloy." Journal of Electronic Materials 47, no. 6 (November 21, 2017): 3184–88. http://dx.doi.org/10.1007/s11664-017-5932-8.

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40

Radoń, Adrian, Mariola Kądziołka-Gaweł, Dariusz Łukowiec, Piotr Gębara, Katarzyna Cesarz-Andraczke, Aleksandra Kolano-Burian, Patryk Włodarczyk, Marcin Polak, and Rafał Babilas. "Influence of Magnetite Nanoparticles Shape and Spontaneous Surface Oxidation on the Electron Transport Mechanism." Materials 14, no. 18 (September 12, 2021): 5241. http://dx.doi.org/10.3390/ma14185241.

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Анотація:

The spontaneous oxidation of a magnetite surface and shape design are major aspects of synthesizing various nanostructures with unique magnetic and electrical properties, catalytic activity, and biocompatibility. In this article, the roles of different organic modifiers on the shape and formation of an oxidized layer composed of maghemite were discussed and described in the context of magnetic and electrical properties. It was confirmed that Fe3O4 nanoparticles synthesized in the presence of triphenylphosphine could be characterized by cuboidal shape, a relatively low average particle size (9.6 ± 2.0 nm), and high saturation magnetization equal to 55.2 emu/g. Furthermore, it has been confirmed that low-frequency conductivity and dielectric properties are related to surface disordering and oxidation. The electric energy storage possibility increased for nanoparticles with a disordered and oxidized surface, whereas the dielectric losses in these particles were strongly related to their size. The cuboidal magnetite nanoparticles synthesized in the presence of triphenylphosphine had an ultrahigh electrical conductivity (1.02 × 10−4 S/cm at 10 Hz) in comparison to the spherical ones. At higher temperatures, the maghemite content altered the behavior of electrons. The electrical conductivity can be described by correlated barrier hopping or overlapping large polaron tunneling. Interestingly, the activation energies of electrons transport by the surface were similar for all the analyzed nanoparticles in low- and high-temperature ranges.

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41

PRASAD, N. V., G. PRASAD, and G. S. KUMAR. "ELECTRICAL PROPERTIES OF RARE EARTH SUBSTITUTED Bi6Fe2Ti3O18 COMPOUND." International Journal of Modern Physics B 16, no. 16 (June 30, 2002): 2231–46. http://dx.doi.org/10.1142/s0217979202010324.

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Анотація:

The Ac conductivity measurements of polycrystalline materials of rare earth substituted Bi 6 Fe 2 Ti 3O18 compound at different frequencies (1 kHz–1 MHz) and temperatures (30–550°C) are reported. The dc conductivity, ionic hoping rate as well as carrier densities have been extracted from the ac conductivity data. The results show that hoping mechanism dominates at lower temperature. The results are discussed.

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42

Aziz, Shujahadeen B., and Zul Hazrin Z. Abidin. "Electrical Conduction Mechanism in Solid Polymer Electrolytes: New Concepts to Arrhenius Equation." Journal of Soft Matter 2013 (July 24, 2013): 1–8. http://dx.doi.org/10.1155/2013/323868.

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Solid polymer electrolytes based on chitosan NaCF3SO3 have been prepared by the solution cast technique. X-ray diffraction shows that the crystalline phase of the pure chitosan membrane has been partially disrupted. The fourier transform infrared (FTIR) results reveal the complexation between the chitosan polymer and the sodium triflate (NaTf) salt. The dielectric constant and DC conductivity follow the same trend with NaTf salt concentration. The increase in dielectric constant at different temperatures indicates an increase in DC conductivity. The ion conduction mechanism follows the Arrhenius behavior. The dependence of DC conductivity on both temperature and dielectric constant (σdc(T,ε′)=σ0e−Ea/KBT) is also demonstrated.

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43

Timokhin, Viktor M. "Studying Breakdown and Electrical Hardening of Crystal Materials with Proton Conductivity." Key Engineering Materials 909 (February 4, 2022): 3–12. http://dx.doi.org/10.4028/p-en1raa.

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The breakdown mechanism of a number of crystal materials with hydrogen bonds is investigated. The contribution of the proton component is considered and it is shown that the formation of an avalanche-streamer discharge is characteristic of multilayer electrical insulation materials. As a result of the breakdown, a discharge channel is formed, along which the protons that form the reverse proton conductivity will move in the opposite direction. In the process of directed translational diffusion of protons, the formation and decay of H3O+ and OH-ions occur, which move in opposite directions, resulting in the formation of a reverse positive streamer from the anode to the cathode. For layered samples of phlogopite, muscovite, and magnesium hydrosilicate, it is shown that for thin samples, a volume charge is formed as a result of a multi-avalanche-streamer discharge that significantly exceeds the volume charge that occurs in thick samples, which is determined by the value of high temperature maximum of the spectrum of thermally stimulated depolarization currents. The field of the volume charge reduces the external electric field, as a result of which the breakdown field strength in thin samples increases. That is, the material is electrically strengthened. Based on the results of the research, a non-destructive method of electrical hardening of electrical insulation materials was developed, which was confirmed by the patent.

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44

Khiar, A. S. A., S. R. Majid, N. H. Idris, M. F. Hassan, R. Puteh, and A. K. Arof. "Ionic Hopping Transport in Chitosan-Based Polymer Electrolytes." Materials Science Forum 517 (June 2006): 237–41. http://dx.doi.org/10.4028/www.scientific.net/msf.517.237.

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Measurement of the ionic conductivity for the CA-NH4CF3SO3-DMC system was carried out at frequencies of 50 Hz to1 MHz and also at temperatures of 298 K to 313 K. The plot of log σ versus 1000/T shows a linear behavior suggesting that the samples obey the Arrhenius relationship. The electrical relaxation of the system was analyzed using the complex electric modulus M* of the sample with the highest ionic conductivity at various temperatures. The analysis of electrical modulus and dissipation factor (tan δ) shows that charge transport occurs through a hopping mechanism.

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45

Wendler, Leonardo, Kethlinn Ramos та Dulcina Souza. "Influence of ZnO addition on microstructure and proton electrical conductivity of BaZr0.8Y0.2O3-δ ceramics". Processing and Application of Ceramics 15, № 2 (2021): 202–9. http://dx.doi.org/10.2298/pac2102202w.

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Sintering aids are widely used to promote densification and grain growth for electrolytes based on yttriumdoped barium zirconate. However, there are some discrepancies in the literature about the influence of these sintering aids on the microstructure development. Some authors consider that ZnO remains on grain boundaries, forming an amorphous phase that promotes sintering, and others proposed that ZnO forms a solid solution with barium zirconate. Even considering different mechanisms, it was proposed that ZnO addition compromised protonic conductivity. In this work BaZr0.8Y0.2O3-? (BZY20) was prepared by conventional oxide mixture (solid state sintering), adding ZnO as sintering aid. We proposed a mechanism for the ZnO actuation on the microstructure development, by the formation of a liquid phase during sintering and formation of a vitreous phase throughout grain boundaries during cooling. This could be the reason for poor protonic conductivity in comparison to the undoped BZY20 electrolytes. The proposed mechanism was established through the scanning electron microscopy analyses and electrical conductivity measurements under several different atmospheres by impedance spectroscopy. High density samples were obtained by using ZnO, but with compromised electrical conductivity compared to the undoped samples.

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46

Yan, Yan-Ying, Qing-An Zhang, Er-Chun Li, and Ya-Feng Zhang. "Ions in Wine and Their Relation to Electrical Conductivity Under Ultrasound Irradiation." Journal of AOAC INTERNATIONAL 100, no. 5 (September 1, 2017): 1516–23. http://dx.doi.org/10.5740/jaoacint.17-0024.

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Abstract Change in electrical conductivity is considered apotential indicator for the on-line monitoring of wine aging accelerated by ultrasound, as determined inour previous study; however, the exact mechanism of change is currently unclear. In this study, the ion content and the total ionic strength were analyzed by ion-exchange chromatography to investigate the change mechanism of the electrical conductivity of wineunder ultrasound irradiation. The results indicate that the changes in wine electrical conductivity during ultrasound treatment correlate with the changes in the cations (Na+, K+, Ca2+, Mg2+, and NH4+) and in the anions from the organic acids (malic acid, citric acid, tartaric acid, oxalic acid, and formic acid) and inorganic acids (Cl−, SO42−, and PO43−), especially for the ionic strength of the wine. Overall, electrical conductivity may be used to reflect the chemical reactions related to wine aging to a certain extent becausethe reactions can be initiated by the conversion of cations and by the degradation or auxiliary functionof organic acids.

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47

Fu, Ren Chun, Jun Du, Hui Huang, and Zhong Cheng Guo. "The Electrical Conductivity Stability of Polyaniline Doped with Three Different Acids." Advanced Materials Research 774-776 (September 2013): 803–6. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.803.

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The doping acid will obviously effect on the properties of polyaniline. In order to investigate the industrial acids influence the electrical conductivity stability of polyaniline, the hydrochloric acid (HCl), sulfuric acid (SA) and methanesulfonic acid (MSA) in industrial degree were chosen as doping acids to synthesize polyaniline. The stability of electrical conductivity was measured by in situ temperature. The mechanism of temperature dependence of electrical conductivity was discussed. The results revealed that the stability of polyaniline doped by hydrochloric acid (HCl) was better than that of polyaniline doped by other acids. The variable-range hopping (VRH) model could explain the temperature dependence of electrical conductivity of polyaniline.

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48

Jung, Woo-Hwan. "Dielectric Relaxation and Hopping Conduction in La2NiO4+δ". Journal of Materials 2013 (20 лютого 2013): 1–6. http://dx.doi.org/10.1155/2013/169528.

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Анотація:

An ac conductivity as well as dielectric relaxation property of La2NiO4.1 is reported in the temperature range of 77 K–130 K and in the frequency range of 20 Hz–1 MHz. Complex impedance plane plots show that the relaxation (conduction) mechanism in this material is purely a bulk effect arising from the semiconductive grain. The relaxation mechanism has been discussed in the frame of electric modulus spectra. The scaling behavior of the modulus suggests that the relaxation mechanism describes the same mechanism at various temperatures. The logarithmic angular frequency dependence of the loss peak is found to obey the Arrhenius law with the activation energy of ~0.09 eV. The frequency-dependent electrical data are also analyzed in the frame of ac conductivity formalism. The ac conductivity has been found to follow a power-law behavior at a limited temperature and frequency region where Anderson localization plays a significant role in the transport mechanism for La2NiO4.1.

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49

Alosabi, A. Q., A. A. Al-Muntaser, M. M. El-Nahass, and A. H. Oraby. "Electrical conduction mechanism and dielectric relaxation of bulk disodium phthalocyanine." Physica Scripta 97, no. 5 (April 1, 2022): 055804. http://dx.doi.org/10.1088/1402-4896/ac5ff8.

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Анотація:

Abstract AC conductivity and dielectric characteristics of disodium phthalocyanine (Na2Pc) in a pellet form were investigated in a frequency range from 45 Hz to 3.12 MHz and a temperature range from 303 to 423 K. The charge carrier transport mechanism was determined according to the correlated barrier hopping model (CBH). Also, the electrical parameters were estimated in light of this model. The thermal activation energy of AC conductivity decreases with increasing frequency. The behavior dependence of dielectric loss and dielectric constant on temperature and frequency was discussed. The behavior of dielectric loss was explained based on the Giuntini model. The maximum value of barrier height, W M , was obtained to equal 0.38 eV . The results showed that the type of relaxation mechanism is a non-Debye one. The activation energy is calculated for dielectric relaxation to be 0.36 eV .

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50

Scipioni, Roberto, Lars Stixrude, and Michael P. Desjarlais. "Electrical conductivity of SiO2 at extreme conditions and planetary dynamos." Proceedings of the National Academy of Sciences 114, no. 34 (August 7, 2017): 9009–13. http://dx.doi.org/10.1073/pnas.1704762114.

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Ab intio molecular dynamics simulations show that the electrical conductivity of liquid SiO2 is semimetallic at the conditions of the deep molten mantle of early Earth and super-Earths, raising the possibility of silicate dynamos in these bodies. Whereas the electrical conductivity increases uniformly with increasing temperature, it depends nonmonotonically on compression. At very high pressure, the electrical conductivity decreases on compression, opposite to the behavior of many materials. We show that this behavior is caused by a novel compression mechanism: the development of broken charge ordering, and its influence on the electronic band gap.

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