Influence of Ag, Cd or Pb Addition on Electrical and Dielectric Properties of Bulk Glassy Se-Ge

El-Metwally, E.G.; Shakra, A.M.

doi:10.1007/s11664-018-6353-z

Cited by 15 publications

(5 citation statements)

References 36 publications

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“…This behavior is in harmony with the observed decrease in W m with LTO vol% and indicates that the addition of LTO NPs introduces more localized states to the matrix. These findings are consistent with that obtained before in amorphous semiconductor materials 26,65 …”

Section: Resultssupporting

confidence: 93%

“…An automatic programmable RLC meter (FLUKE PM6306) was used to measure the capacitance C P , the resistance R P in parallel, and loss tangent (tan δ ) directly in the frequency range of (100 Hz‐1 MHz) and in the temperature range of (303‐413 K). The ac conductivity σ ac ( ω ), dielectric constant ε ′( ω ), and dielectric loss ε ″( ω ) were calculated for all investigated compositions according to 26 :

ε^{'} ((), ω) = \frac{C_{P} t}{ε_{o} A}

ε^{''} ((), ω) = ε^{'} ((), ω) \tan δ

where t is the sample thickness, A its cross‐section area, and ε o is the free space permittivity.…”

Section: Methodsmentioning

confidence: 99%

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Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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Polymer nanocomposites consisting of materials such as ionic polymers and nano‐ceramic fillers are widely used in high‐power lithium‐polymer batteries because of their high ionic conductivity, good mechanical strength, electrothermal stability, and better compatibility with electrodes. Nanocomposite films of polyvinylidene fluoride (PVDF)/lithium titanium oxide Li4Ti5O12 (LTO) with different volume fractions of LTO nanoparticles (NPs) are prepared via casting method. The DSC thermograms revealed a slight decrease in the melting temperature Tm and a noticeable reduction in the degree of crystallinity with increasing the volume fraction of LTO. This decrease is confirmed by the increment in the relative fraction of β‐phase in the PVDF matrix calculated from both XRD and FTIR. SEM images indicated the growth of porous globular structures in the presence of LTO NPs. Besides, the hydrophilicity of PVDF is improved by incorporating LTO NPs. The dielectric constant ε′(ω), loss ε″(ω), ac conductivity σac(ω), complex impedance Z*(ω), and Nyquist plots of PVDF/LTO nanocomposites are investigated in the temperature range from 303 to 413 K and frequency range from 100 Hz to 1 MHz. The σac(ω) and frequency exponent s are found to obey the correlated barrier hopping model. Values of the frequency exponent s and the charge carriers binding energy Wm for the studied nanocomposite films decrease with rising temperature and LTO addition. Furthermore, dielectric constant ε′(ω), loss ε″(ω), and ac electrical conductivity σac(ω) of films are found to be strongly frequency and temperature dependent. The localized states density N(EF) at the Fermi level increase with increasing temperature and LTO NPs volume fraction, resulting in the Wm decrease and the enhancement of the ac electrical conductivity σac(ω). The impedance spectrum and Nyquist plots provide an insight into the influence of LTO vol% in the resistive and capacitive characteristics of PVDF/LTO films. These results recommend the choice of LTO NPs as dopants to enhance the electrical properties of the PVDF matrix to be used in high‐power lithium‐ion batteries and electronic devices.

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Section: Resultssupporting

confidence: 93%

ε^{'} ((), ω) = \frac{C_{P} t}{ε_{o} A}

ε^{''} ((), ω) = ε^{'} ((), ω) \tan δ

where t is the sample thickness, A its cross‐section area, and ε o is the free space permittivity.…”

Section: Methodsmentioning

confidence: 99%

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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“…The presence of the multiple oxidative states is also a key requirement for satisfying catalytic functionality of such metallic doped semiconductor. These results are consistent with the experimentally observed localized states near the Fermi level which are enhanced after metallic doping 41,60 .…”

Section: Modulated Oxidative States Of Cationic Dopants With Strainsupporting

confidence: 92%

Substitutional doped GeSe: tunable oxidative states with strain engineering

Shu

Cai

2020

J. Mater. Chem. C

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“…At lower temperatures the dielectric constant increases slowly and then increases more with increasing temperature. The same results was obtained for all the studied compositions and similar to results obtained before [40,35,36,32].…”

Section: -The Dependence Of Ac Conductivity On Temperaturesupporting

confidence: 89%

Estimation of The Electrical and Dielectric Properties For Se98Te2 and Se96Te2X2 (X = Zn and Cd) Amorphous Films.

Shakra

Fadel

Kalila³

2021

Preprint

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Bulk glassy Se98Te2 and Se96Te2X2 (X = Zn and Cd) were prepared by melting quenching method. Thin films of various thicknesses (200 – 670 nm) were obtained by the thermal evaporation method. The structure of the prepared compositions was investigated by X-ray and EDX analysis. We studied the effect of Zn and Cd addition on the electric and dielectric properties of Se98Te2 thin films. Our measurements were studied in the temperature range (298-323K) below the glass transition temperature and frequency range (100 Hz-1 MHz). DC conductivity showed a single conduction mechanism by hopping of charge carriers at the band edges for the studied system. The dependence of Ac conductivity on frequency is linear with frequency exponent s lies very close to unit and is independent of temperature. This can be explained by the correlated barrier hopping (CBH) model. The dielectric constant ε1 and dielectric loss ε2 noticed to decrease with frequency and increase with temperature. The maximum barrier height Wm was calculated according to Guinitin.

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Influence of Ag, Cd or Pb Addition on Electrical and Dielectric Properties of Bulk Glassy Se-Ge

Cited by 15 publications

References 36 publications

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Substitutional doped GeSe: tunable oxidative states with strain engineering

Estimation of The Electrical and Dielectric Properties For Se98Te2 and Se96Te2X2 (X = Zn and Cd) Amorphous Films.

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Influence of Ag, Cd or Pb Addition on Electrical and Dielectric Properties of Bulk Glassy Se-Ge

Cited by 15 publications

References 36 publications

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Substitutional doped GeSe: tunable oxidative states with strain engineering

Estimation of The Electrical and Dielectric Properties For Se98Te2 and Se96Te2X2 (X = Zn and Cd) Amorphous Films.

Contact Info

Product

Resources

About

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries