Dielectric investigations and ac conductivity of polyvinyl alcohol films doped with europium and terbium chloride

El‐Kader, F. H. Abd; Osman, W.; Mahmoud, Khaled H.; Basha, Mohammad Ahmad-Fouad

doi:10.1016/j.physb.2008.05.009

Cited by 49 publications

(32 citation statements)

References 27 publications

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“…5 The q-relaxation process for semi-crystalline polymer like PVA is related to chain trapping of interfaces or Maxwell-Wagner-Sillers (MWS) polarization phenomena within the sample. 8 However, in the amorphous part of PVA, q-process can be assigned to conductive impurities, injected space charges, and electrode polarization. This process originates from the motion of space charges which accumulate in the polymer close the electrodes.…”

Section: -2mentioning

confidence: 99%

“…Polyvinyl alcohol (PVA) anions are suitable bridging ligands for constructing network coordination polymers. 5,6,[8][9][10] PVA is a semi-crystalline polymer and its crystalline index depends on the synthetic process and physical aging. 8 It has gained increasing attention in the biomedical field due to bioinertness.…”

Section: Introductionmentioning

confidence: 99%

“…5,6,[8][9][10] PVA is a semi-crystalline polymer and its crystalline index depends on the synthetic process and physical aging. 8 It has gained increasing attention in the biomedical field due to bioinertness. 11,12 Polymers and polymeric composites have steadily gained growing importance in our daily life.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

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Fourier transform infrared (FTIR) spectrum dielectric constant, e 0 , loss tangent, tan(d), electric modulus, M*, and ac conductivity, r ac , of pure polyvinyl alcohol (PVA) as well as La-, Gd-, and Er-PVA doped samples have been carried out. The dielectric properties have been studied in the temperature and frequency ranges; 300-450 K and 1 kHz-4 MHz, respectively. FTIR measurements reveal that La 3þ , Gd 3þ , and Er 3þ ions form complex configuration within PVA structure. Two relaxation processes, namely, q and a were observed in pure PVA sample. The first process is due to the interfacial or Maxwell-Wagner-Sillers polarization. The second one is related to the micro-Brownian motion of the main chains. For doped PVA samples, a-relaxation process splits into a a and a c . This splitting is due to the segmental motion in the amorphous (a a ) and crystalline (a c ) phases of PVA matrix. Electric modulus analysis was discussed to understand the mechanism of the electrical transport process. The behavior of ac conductivity for all PVA samples indicates that the conduction mechanism is correlated barrier hopping. V C 2012 American Institute of Physics. [http://dx

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Section: -2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

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“…within the BPACC sample [15,16]. Then, the current flow in the second region obeys the equation [10,17]:…”

Section: I-v Characteristicsmentioning

confidence: 99%

“…The behavior of dc conductivity in regions (I and II) can be described according to Arrhenius equation [17,22]:…”

Section: Conductivitymentioning

confidence: 99%

Transient and Steady State Currents of Bisphenol A Corncobs Sample

Hanafy¹

2011

AMPC

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Transient current (I-t), current-voltage (I-V) characteristics, and dc conductivity ln(σ) for bisphenol A corncobs (BPACC) sample were investigated. At higher temperatures, I-V characteristics reveal that the dc current for the sample undergoes two regions one due to ohmic conduction and the other has been attributed to Space charge limited current (SCLC). The activation energy (E a ), the electron mobility (μ o ), effective electron mobility (μ e ), the concentration of the charge's concentrations in conduction band, trapping factor (θ) and the trap concentration (N t ) were calculated. At lower temperatures, the dc current exhibits a peculiar behavior for I-t regime and I-V characteristics. Transient current of BPACC sample exhibits approximately constant value at constant electric field and it has saturation value for I-V characteristics. The attained results suggest strongly the applicability of this material in the electrical applications.

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Spectroscopic, magnetic, and optical characterization of nanocomposite films of polyvinylpyrrolidone doped with cerium disulphate

Basha

2011

J of Applied Polymer Sci

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New nanocomposite hybrid films of a well dispersed cerium disulphate Ce(SO 4 ) 2 nanoparticles into the polyvinylpyrrolidone (PVP) matrix were prepared by a casting technique. The nanostructural nature and complex formation were investigated using the transmission electron microscopy (TEM), the nuclear magnetic resonance (NMR), and the Infrared (IR) spectroscopy. The magnetic measurements at room temperature, using a vibrating sample magnetometer (VSM), and the obtained magnetic parameters revealed that the investigated nanocomposites belong to a category of magnetically soft materials that find widespread applications in contemporary fine technologies. Optical absorption spectra were measured in the ultraviolet (UV)-visible region and the fundamental absorption edge E a , the energy gap E g and width of the tail of localized states E e were evaluated and discussed in terms of the solid band theory. The monotonic increase of these optical parameters with the dopant concentration may be attributed to probable segregation effects occurring in the amorphous host matrix.

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Dielectric investigations and ac conductivity of polyvinyl alcohol films doped with europium and terbium chloride

Cited by 49 publications

References 27 publications

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Transient and Steady State Currents of Bisphenol A Corncobs Sample

Spectroscopic, magnetic, and optical characterization of nanocomposite films of polyvinylpyrrolidone doped with cerium disulphate

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