Journal ArticleDOI
Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses
M. M. El-Desoky,I. Kashif +1 more
TLDR
In this article, the electrical properties of mixed CaO and BaO glasses were studied in the frequency range 400 Hz-200 kHz and over a temperature range 323-593 K.Abstract:
The electrical properties of xCaO-(20 - x)BaO-20Fe 2 O 3 -60P 2 O 5 glasses with x = 0, 5, 10, 15 and 20 mol% have been studied in the frequency range 400 Hz-200 kHz and over a temperature range 323-593 K. The ac conductivity as a function of temperature was divided into two domains, one where the absolute magnitude of the ac conductivity was close to the dc conductivity and another where it was larger than the dc conductivity. At the same temperature, the dc conductivity varied only slightly in glasses with different CaO and BaO content. It is concluded that the conductivity in these mixed CaO and BaO iron phosphate glasses is electronic and depends upon the Fe 2+ /(Fe 2+ + Fe 3+ ) ratio. In the high-temperature region above θ D /2 (where θ D is the Debye temperature) the Mott model of small polaron hopping (SPH) between nearest neighbours is consistent with the conductivity data, while at low temperature (below θ D ) the Greaves intermediate variable-range hopping (VRH) model is found to be appropriate. The electrical conduction of the glasses is confirmed to be non-adiabatic SPH. Mossbauer spectral analysis indicates the presence of both Fe 2+ and Fe 3+ ions.read more
Citations
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Journal ArticleDOI
Characterization and transport properties of V2O5-Fe2O3-TeO2 glasses
TL;DR: In this article, the authors investigated the conductivity of V2O5-Fe2O3-TeO2 system and found that the conductivities varied from 3.31% to 6% due to adiabatic small polaron hopping.
Journal ArticleDOI
Structural and Polaronic transport properties of semiconducting CuO–V2O5–TeO2 glasses
TL;DR: In this article, the conduction was confirmed to obey the adiabatic SPH and was mainly due to electronic transport between V ions, the dominant factor determining conductivity was the hopping carrier mobility in these glasses.
Journal ArticleDOI
Electrical conductivity studies in single and mixed alkali doped cobalt–borate glasses
TL;DR: In this paper, Li 2 O x −(CoO) 0.2 −(B 2 O 3 ) 0.8−x and (Li 2 O) x -CoO 0.6−x were prepared by melt quench technique and their non-crystallinity has been established by XRD studies.
Journal ArticleDOI
Structural and other physical properties of barium vanadate glasses
TL;DR: In this article, BaO was introduced into the V 2D layer structure of the crystalline V 2 O 5 into a more complicated 3D structure and the electrical properties were analyzed in the light of small polaron hopping model.
Journal ArticleDOI
Study of nanostructural behavior and transport properties of BaTiO3 doped vanadate glasses and glass–ceramics dispersed with ferroelectric nanocrystals
Mohammad S. Al-Assiri,M. M. El-Desoky,Ali Al-Hajry,A. Al-Shahrani,A. Al-Mogeeth,A. A. Bahgat +5 more
TL;DR: In this article, the electrical properties of BaTiO 3 -V 2 O 5 glasses and their corresponding nanocrystalline glass-ceramics were studied using scanning electron microscopy (SEM) and X-ray diffraction.
References
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Journal ArticleDOI
Dispersion and Absorption in Dielectrics I. Alternating Current Characteristics
Kenneth S. Cole,Robert H. Cole +1 more
TL;DR: In this paper, the locus of the dielectric constant in the complex plane was defined to be a circular arc with end points on the axis of reals and center below this axis.
Journal ArticleDOI
Studies of polaron motion: Part II. The “small” polaron
TL;DR: In this article, the authors considered the case in which the electronic-overlap term of the total Hamiltonian is a small perturbation, and showed that the probability of off-diagonal transitions goes up exponentially with increasing temperature.
Journal ArticleDOI
Conduction in glasses containing transition metal ions
TL;DR: In this article, a discussion of conduction in glasses containing transition metal ions is presented, and the Miller-Abrahams term and polaron hopping term tend to zero, giving a decreasing slope of the ln p versus 1/T curve.
Journal ArticleDOI
A.c. conduction in amorphous chalcogenide and pnictide semiconductors
TL;DR: In this article, a comprehensive survey is given of the experimental a.c. data for two types of amorphous semiconductor, namely chalcogenide and pnictide materials, and it is concluded that the behavior at intermediate to high temperatures is well accounted for by the correlated-barrier-hopping model, whereas the low-temperature behaviour is probably due to atomic tunnelling.