AC conductivity and dielectric measurements of bulk magnesium phthalocyanine (MgPc)

Atta, A.A.

doi:10.1016/j.jallcom.2009.01.124

Cited by 47 publications

(10 citation statements)

References 22 publications

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“…It was found that at the first stages of heating temperatures, complex (6) has the highest value of r ac compared to SQL and other complexes at T = 328 K. The temperature dependence of r ac can follow the well known Arrhenius relation [40,41]:…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 98%

“…The ac conductivity, r ac , can be calculated in terms of e i , according to the relation [40,41]: The values of r ac as a function of temperature for SQL and its complexes are investigated in the frequency range of 0.1-100 kHz and in the temperature range of 298-583 K and 303-673 K, respectively, and in the frequency range of 0.1-100 kHz. It was found that at the first stages of heating temperatures, complex (6) has the highest value of r ac compared to SQL and other complexes at T = 328 K. The temperature dependence of r ac can follow the well known Arrhenius relation [40,41]:…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

“…To investigate the operating conduction mechanism in a material, the dependence of r ac on frequency can be analyzed according to the relation [40,41]:…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

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Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO 2 (II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (r ac ) and conduction mechanism of SQL and its complexes (1-6) are investigated in the frequency range of 0.1-100 kHz and temperature range 298-583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023-0.0798 eV for DE 1 and 0.0897-1.296 eV for DE 2 . The ac conductivity, r ac , is related to the frequency as r ac a x S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3-5), and the values of the maximum barrier height (W m ) are calculated for SQL and its complexes (1) and (3-5). The quantum-mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

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Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 98%

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

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Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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“…The values of r ac as a function of temperature and frequency for PANAA (Z 0 ) copolymer and PANAANi composite (Z 2 ) were investigated in the temperature range 300-583 K, and in frequency range 0.1-100 kHz. The temperature dependence of r ac could be followed Arrhenius relation [53,[55][56][57]:…”

Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 99%

Effect of Doping with Nickel Ions on the Electrical Properties of Poly(aniline-co-o-anthranilic acid) and Doped Copolymer as Precursor of NiO Nanoparticles

Zoromba

El-Ghamaz

Alghool

2015

J Inorg Organomet Polym

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Poly(aniline-co-o-anthranilic acid) (PANAA) and its nickel composite (PANAA-Ni) are successfully prepared based on oxidative chemical polymerization via two comparative in situ and ex situ polymerization methods. PANAA copolymer contains aniline, and o-anthranilic acid moieties, were doped with different concentrations of nickel ions. The ratios of aniline, o-anthranilic acid, and nickel chloride were (1:1:0.5) and (1:1:1), respectively. The effect of nickel moiety on the properties of polyconjugated polymers, and their spectral characteristics (UVVis absorption spectra, FTIR, thermal stability) were recorded. TGA analysis confirmed that the poly(aniline-coo-anthranilic acid)/nickel (PANAA-Ni) composites, which were prepared by in situ or ex situ polymerization method, are more thermally stable than the pure PANAA copolymer. The XRD revealed that the pure and PANAA-Ni (prepared by ex situ polymerization method) is completely amorphous structure, while the PANAA-Ni composite (prepared by in situ polymerization method) is a mixture of crystalline and amorphous phases. The temperature dependence of dielectric constants (e r and e i ) as well as AC conductivity (r ac ) were investigated in the temperature range of 300-383 K and test frequency range of 0.1-100 kHz. All the tested samples showed semiconductor behavior. The values of thermal activation energies DE1 and DE2 for PANAA copolymer are calculated, and found to be in the range of 0.03-0.1 eV and 0.58-1.88 eV, respectively. We calculated DE1 and DE2 for PANAA-Ni composite, and we found their values in the range of 0.14-0.27 eV and 0.41-0.58 eV, respectively. Moreover, Nanocrystalline nickel oxide NiO powder was prepared by thermal decomposition route of (PANAA-Ni) composites, which was prepared by in situ polymerization method. The size of the obtained nickel oxide nanoparticle was determined by transmission electron microscope .

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“…The obtained value of W M is equal to 170 meV. Generally, the experimental value of W M is equal or less than band gap energy (E g ) of the material which reflects the influence of the sample structure, such as grain size and orientation, defect distribution, phase content, Urbach tailing phenomenon and charge density [60,61]. At low frequencies, the conductance G is frequency independent and equal to the value G dc .…”

Section: Electrical Propertiesmentioning

confidence: 96%

Some physical investigations on In2S3:Sn sprayed thin film

Kraini

Bouguila

Bettaibi

et al. 2016

J Mater Sci: Mater Electron

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Tin doped In 2 S 3 film was grown by chemical spray pyrolysis method using compressed air as a carrier gas. Structural, morphological, optical and electrical properties of film have been investigated. X-ray diffraction shows well crystallized film according to cubic b-In 2 S 3 phase. The FESEM photograph reveals that the film is dense without pinholes. The average surface roughness and the root-mean square roughness are about 18 and 14 nm, respectively. Optical transmission is more than 60 % in visible region and 85 % in infrared one. Direct band gap energy of 2.62 eV has been found. The impedance plane plot shows semicircle arcs and an electrical equivalent circuit has been proposed to explain the impedance results. We have performed ac and dc conductivity studies inspired from Jonscher and correlated barrier-hopping models. These studies helped establishing significant correlation between temperature and activation energy. From the impedance spectroscopy analysis, we investigated the frequency relaxation phenomenon and the equivalent circuit of such thin film.

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AC conductivity and dielectric measurements of bulk magnesium phthalocyanine (MgPc)

Cited by 47 publications

References 22 publications

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Effect of Doping with Nickel Ions on the Electrical Properties of Poly(aniline-co-o-anthranilic acid) and Doped Copolymer as Precursor of NiO Nanoparticles

Some physical investigations on In2S3:Sn sprayed thin film

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