Negative dielectric loss phenomenon in porous sol–gel glasses

Axelrod, E.; Puzenko, Alexander; Haruvy, Y.; Reisfeld, R.; Feldman, Yuri

doi:10.1016/j.jnoncrysol.2006.07.008

Cited by 33 publications

(26 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results show that the space charge separation and interfacial polarization are the sole cause of drastic variation in dielectric properties of PU + CdS embedded samples. Our results are quite compatible to those reported by Axelrod et al43 in porous sol–gel glasses and others 44,45…”

Section: Resultssupporting

confidence: 94%

Structural and Dielectric Properties of CdS Nanoparticle Embedded Polyurethane Nanocomposite Samples

et al. 2012

View full text Add to dashboard Cite

The polymer nanocomposite samples have been prepared by solution embedding of CdS nanoparticles in polyurethane (PU). The structural properties have been studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM images represent the dispersion of CdS nanoparticles in a polymer matrix. The permittivity of nanocomposite samples increases with temperature due to formation of new dipoles or accumulation of charge carriers in a nanoparticle-polymer interface. The increase in permittivity with temperature can be attributed to the heat-assisted dipole moment. Furthermore, it has been observed that permittivity is the function of nanoparticle concentration, temperature, and frequency. The high concentration of nanoparticles lowers permittivity with frequency. The positive and negative tangential loss has been observed in PU-CdS nanocomposite samples. The

show abstract

Section: Resultssupporting

confidence: 94%

Structural and Dielectric Properties of CdS Nanoparticle Embedded Polyurethane Nanocomposite Samples

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Positive dielectric loss corresponds to the normal relaxation processes that are associated with process of absorption and emission of energy. Axelrod et al showed in their work [22] that a negative loss phenomenon is related to the fact that more energy must be released than absorbed. According to, the principle of energy conservation, the total energy in the ceramic sample must be conserved.…”

Section: Resultsmentioning

confidence: 99%

“…This metastable state may be eliminated under certain conditions such us temperature and frequency. The specified temperature and frequency may cause avalanche recombination of charges, which results in the effect of energy emission [22]. Figure 6 shows the Arrhenius plot i.e.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and dielectric properties of BF–PFN ceramics with negative dielectric loss

Bartkowska

Bochenek

2018

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Multiferroics with negative value of dielectric constant are very promising materials because of their modern applicability. These materials can be used as materials for the construction of electromagnetic radiation shields. The subject of the research is multiferroic BiFeO 3-PbFe 1/2 Nb 1/2 O 3 (BF-PFN) ceramics. For all multiferroic materials the following studies are conducted: SEM, EDS and the temperature dependence of dielectric constant ε′(T). Above a certain temperature (different for different chemical compositions) the value of dielectric constant reaches negative values. Such the behavior of the dielectric constant may indicate that the polarization inside the material has a reverse direction to the external electric field. That is, the electric field inside the material counteracts the applied external electric field. The obtaining materials also show negative dielectric losses. The Axelrod model is used to explain the mechanism that causes negative dielectric loss.

show abstract

“…Отрицательные диэлектрические потери наблюдались в случае стекол с мелкой пористостью, полученных с помощью регулярных и быстрых золь-гель-маршрутов [13]. Их исследование методом диэлектрической спектроскопии проводилось в диапазоне частот от 20 Гц до 1 МГц при температурах от -100 до +300°C.…”

Section: Introductionunclassified

Нано- И Микроструктуры С Равными Нулю Омическими Потерями В Спонтанно Поляризованном Состоянии

Rogov¹,

Харламов²

2019

Rossijskie nanotehnologii

View full text Add to dashboard Cite

Получены структуры с равным нулю омическим сопротивлением для постоянного и синусоидального электрического тока. Так же как и в случае сверхпроводимости, этот эффект обусловлен обменно-корреляционным взаимодействием электронов, однако его причина иная и состоит в поляризации структуры электрическим полем, а не в поляризации решетки куперовскими парами.

show abstract

Negative dielectric loss phenomenon in porous sol–gel glasses

Cited by 33 publications

References 12 publications

Structural and Dielectric Properties of CdS Nanoparticle Embedded Polyurethane Nanocomposite Samples

Structural and Dielectric Properties of CdS Nanoparticle Embedded Polyurethane Nanocomposite Samples

Microstructure and dielectric properties of BF–PFN ceramics with negative dielectric loss

Нано- И Микроструктуры С Равными Нулю Омическими Потерями В Спонтанно Поляризованном Состоянии

Contact Info

Product

Resources

About