Structure and electrical properties of Co0.5CdxFe2.5−xO4 ferrites

Farea, A.M.M.; Kumar, Shalendra; Batoo, Khalid Mujasam; Yousef, Ali; Lee, Chan Gyu; Alimuddin, Alimuddin

doi:10.1016/j.jallcom.2007.09.126

Cited by 222 publications

(63 citation statements)

References 28 publications

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“…393 K -413 K, s decreases as temperature increases indicating prevalence of correlated barrier hopping. 26,27 This observation of two different conduction phenomena is possible as described by Rezlescu et al 33 Figure 5(c) shows Arrhenius curve for NiS 2 nanoparticles at 100 Hz. Activation energy E a = 0.54 eV was obtained from the slope of this curve.…”

Section: -7mentioning

confidence: 53%

“…These charge carriers take part in conduction in addition to charge carriers produced from valence exchange between different metal ions. 26 The ac conductivity obtained for NiS 2 nanoparticles is 1-2 order of magnitude greater than that of Bi 2 S 3 nanorods 25 and CdS nanoparticles 29 at all temperatures and frequencies. Relatively higher ac conductivity of NiS 2 nanoparticles may be better for electronic device applications.…”

Section: -7mentioning

confidence: 87%

“…This implies an increase in conduction, improvement in dielectric properties and liberation of space charge. 26 Figure 4(b) shows that Z ′′ initially decreases with an increase in frequency. Then it increases, reaches a maximum value and decreases again.…”

Section: Aip Advances 6 055120 (2016)mentioning

confidence: 96%

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Determination of density of states, conduction mechanisms and dielectric properties of nickel disulfide nanoparticles

Jamil

Batool²,

Sher

et al. 2016

AIP Advances

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Temperature and frequency dependent ac electrical measurements were used to explore density of states, conduction mechanisms and dielectric properties of nickel disulfide (NiS2) nanoparticles. The NiS2 nanoparticles were prepared by conventional one step solid state reaction method at 250 °C. X-ray diffraction (XRD) confirmed cubic phase of prepared nanoparticles. Scanning electron microscope (SEM) images revealed presence of irregular shaped nanoparticles as small as 50 nm. The ac electrical measurements were carried out from 300 K to 413 K. Two depressed semicircular arcs from 20 Hz to 2 MHz showed presence of bulk and grain boundary phases in NiS2 nanoparticles at all temperatures. Small polaron hopping conduction from 300 K to 393 K and correlated barrier hopping conduction mechanism at temperatures higher than 393 K was observed. High value of density of states (of the order of 1024 eV−1cm−3) was calculated from ac conductivity. At low frequencies high values (of the order of 104-107) of real part of dielectric constant (ε′) were observed at different temperatures. These observations suggest that NiS2 nanoparticles may find applications in electronic devices.

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Section: -7mentioning

confidence: 53%

Section: -7mentioning

confidence: 87%

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Determination of density of states, conduction mechanisms and dielectric properties of nickel disulfide nanoparticles

Jamil

Batool²,

Sher

et al. 2016

AIP Advances

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“…The complex dielectric permittivity is represented by ε * = ε − iε , where ε is the real part of the dielectric permittivity that describes the stored energy, while ε is the imaginary part of dielectric permittivity related to the dissipation energy (or loss of energy) within the medium [51]. Figure 8(a) shows that the dielectric constant (ε ) decreases continuously at lower frequencies and remains constant at higher frequencies giving rise to a plateau.…”

Section: Dielectric Analysismentioning

confidence: 99%

Mn3O4 Nanoparticles: Synthesis, Characterization, and Dielectric Properties

Dhaouadi¹,

Ghodbane²,

Hosni

et al. 2012

ISRN Spectroscopy

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Mn 3 O 4 nanoparticles were prepared by a simple chemical route using cetyltetramethylammonium bromide (CTAB) as a template agent. Mn 3 O 4 nanocrystals present an octahedral shape, and their crystallite size varies between 20 and 80 nm. They were characterized by XRD, SEM, DTA/TG, and IR spectroscopy. XRD studies confirm the presence of a highly crystalline Mn 3 O 4 phase. The Rietveld refinement of the X-ray diffraction data confirms that Mn 3 O 4 nanoparticles crystallize in the tetragonal system with space group I41/amd. DTA/TG and XRD measurements demonstrate the phase transition toward a spinel structure between 25 and 700 • C. The electrical conductivity increases between 80 and 300 • C, suggesting a semiconducting behaviour of Mn 3 O 4 . Both dielectric dispersion (ε ) and dielectric loss (ε ) were investigated from 80 and 300 • C in the frequency range of 10 Hz-13 MHz. The dielectric properties showed typical dielectric dispersion based on the Maxwell-Wagner model.

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“…The complex permittivity (ԑ*) is defined by the following expression: ԑ* = ԑ'-iԑ'' where (ԑ') is the real part which represents the absorption phenomenon, and (ԑ'') is the imaginary partrelating to dissipation of energy phenomenon [80]. ԑ' and ԑ'' are determined from the following relations:…”

Section: Study Of Electrical Permittivitymentioning

confidence: 99%