A molecular interpretation of Maxwell–Wagner–Sillars processes

McKenzie, Ruel; Zurawsky, Walter; Mijović, Jovan

doi:10.1016/j.jnoncrysol.2014.09.035

Cited by 31 publications

(19 citation statements)

References 44 publications

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“…MaxwellWagner model is suitable in this case since the interfacial polarization was observed and hence the relaxation peaks can also be seen in the Fig. 4 [11]. By increasing the temperature from 100 to 700°C the magnitude of the dielectric constant increased and the relaxation peaks were observed to be shifted at higher frequencies at higher temperatures.…”

Section: Electrical Analysismentioning

confidence: 87%

“…5 [10]. This relaxation phenomenon can also be related to the insulating or high resistive nature of the dielectric material and it may not be observed for the conductive materials [11].…”

Section: Electrical Analysismentioning

confidence: 98%

“…Dielectric material due to the presence of dielectric interfaces is rendered as non-homogeneous system [11,12]. Presence of dielectric interfaces in dielectric materials and their consequent high resistivity makes them heterogeneous.…”

Section: Electrical Analysismentioning

confidence: 99%

“…XRD patterns for SrFe 12-x Cr x O 19 (x = 0.0, 0.1, 0.2, 0.3)Table 1XRD calculated parameters including structure, crystallite size for major peaks (D), lattice constants (a and c) and volume of unit cell (General interpretation of effect of polarization on dielectric constant as a function of frequency[11] …”

mentioning

confidence: 99%

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Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Anis-ur-Rehman

Zahra

Kanwal

et al. 2015

J Mater Sci: Mater Electron

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Chromium (Cr) doped strontium hexaferrites with nominal composition SrFe 12-x Cr x O 19 (x = 0.0, 0.1, 0.2, 0.3) were prepared using co-precipitation method. Thermal analysis of the samples was carried out using thermogravimetric analysis and differential scanning calorimetry to study the thermal stability as well as the transitions within the samples with variation in temperature. Structural analysis of the samples was carried out using X-ray diffraction (XRD). XRD revealed that all the samples possess hexagonal structure with space group P63/ mmc. AC electrical properties including dielectric constant (e 9), dielectric loss tangent (tan d) and ac electrical conductivity (r ac ) were studied as a function of frequency (1 kHz-3 MHz) at temperatures 100-700°C. The dielectric losses tend to decrease with increasing Cr content. AC conductivity could be very well explained by Jonscher power law. These materials have applications in high frequency devices with reduced energy losses.

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Section: Electrical Analysismentioning

confidence: 87%

“…5 [10]. This relaxation phenomenon can also be related to the insulating or high resistive nature of the dielectric material and it may not be observed for the conductive materials [11].…”

Section: Electrical Analysismentioning

confidence: 98%

Section: Electrical Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Anis-ur-Rehman

Zahra

Kanwal

et al. 2015

J Mater Sci: Mater Electron

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“…One of the solutions that we will suggest to explore using deposition by spray-gun is to fabricate stacked alternating layers of dielectric and graphene. Thank to that, we want to exploit the Maxwell-Wagner-Sillars (MWS) phenomenon [53][54][55], i.e. polarization effects at the interface between the conductive materials (graphene sheets) and dielectric materials (e.g.…”

Section: Carbon-based Non-volatile Memories By Spray-gun Depositionmentioning

confidence: 99%

Deposition of graphene and related nanomaterials by dynamic spray-gun method: a new route to implement nanomaterials in real applications

Bondavalli

Pribat

Legagneux³

et al. 2019

J. Phys. Mater.

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The dynamic spray-gun deposition method was developed in 2006 to fabricate field effect transistors based on random arrays of carbon nanotubes (CNTs) field effect transistors for gas sensing applications. Thanks to this deposition method, we were able to fabricate hundreds of operational devices in a reproducible way that were integrated in electronic chips. Following this first implementation, we decided to widen the application of the deposition technique to the field of Energy and specifically to the fabrication of supercapacitors. In this context, we demonstrated in 2012 the fabrication of nanostructured electrodes for supercapacitors, using mixtures of graphene/graphite and CNTs increasing the device capacitance and the power delivered of a factor 2.5 compared to CNT based electrochemical-double-layer-capacitors. Indeed, with high quality graphene we could reach a value of around 100 W Kg −1 . This value is extremely promising also considering that it has been obtained with an industrially suitable technique. This dynamic spray-gun deposition has been also exploited for the fabrication of resistance based random access memories, making use of thin layers of graphene oxide and of oxidized carbon nanofibers. In the first case, 5000 cycles of 'write' and 'read' phases were demonstrated. These results pave the way for the fabrication of very low cost memories that can be embedded in smart-cards, patches for health monitoring (e.g. diabetes), ID cards, RFID tags and more generally smart packaging. Finally we are also working on the utilization of this technique for the fabrication of layers for electro-magnetic interference shielding application. Thanks to a new machine with four nozzles, developed within the frame of the Graphene Flagship project, we are able to deposit four different nanomaterials at the same time or alternatively on a large surface (30 cm×30 cm) creating specific nano-structuration and therefore ad hoc architectures allowing the smart absorption of specific frequencies (e.g. X-band). All these applications demonstrate the extreme versatility of this technique that constitutes a real breakthrough for exploiting the nanomaterials characteristics in real devices, using an industrial suitable fabrication method that can be implemented using roll-to-roll technique.

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Relaxation dynamic and electrical mobility for poly(methyl methacrylate)‐polyaniline composites

Moussa

Ghoneim

Rehim

et al. 2017

J of Applied Polymer Sci

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Composites of emeraldine form of polyaniline (PAni) and poly(methyl methacrylate) (PMMA) are prepared by emulsion polymerization method in definite ratios. The chemical structure of the samples and their morphologies have been investigated by different techniques including FTIR, UV-vis, XRD, SEM, and TGA. Enhancement in thermal stability of the obtained composites by PAni additions has been confirmed. Alpha analyzer, in frequency range 0.1 Hz to 20 MHz, was employed to investigate the molecular dynamics of the prepared samples and the accompanied electrical conductivity at temperatures ranging from 223 to 423 K. Conductivity investigations showed that mobility has the more dominant effect on the charge transportation. The dynamic peak at lower temperatures of the PMMA has high activation energy (83.8 kJ/mol). While, Maxwill-Wagner-Siller process due to the interfacial polarization in the composites has only 7.5 kJ/mol activation energy. This is a clear indication of the ease of the investigated dynamic.

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A molecular interpretation of Maxwell–Wagner–Sillars processes

Cited by 31 publications

References 44 publications

Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Deposition of graphene and related nanomaterials by dynamic spray-gun method: a new route to implement nanomaterials in real applications

Relaxation dynamic and electrical mobility for poly(methyl methacrylate)‐polyaniline composites

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