Electrical properties of some Y2O3 and/or Fe2O3-containing lithium silicate glasses and glass-ceramics

Gomaa, Mohamed M.; Darwish, H.; Salman, S.M.

doi:10.1007/s10854-007-9288-3

Cited by 27 publications

(15 citation statements)

References 20 publications

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“…Samples generally showed the same general trend for the frequency dependence of the dielectric constant in the supposed range [21,[53][54][55][56][57][58][59][60][61][62][63]. Figure 4 showed the variation of conductivity with frequency for different samples containing various proportions of Ag 2 O/Li 2 O replacements.…”

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 90%

“…However, the increase of Ag 2 O/Li 2 O replacements in the samples G 3 and G 4 led to decrease the A.C. conductivity of the samples. Sample G 1 has the lowest conductivity value [54][55][56][57][58]. Figure 6 showed the dielectric loss (Tan d) of the different samples.…”

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 99%

“…is the capacitance and resistance of the sample at high frequencies, respectively, where no space charges were accumulated. C i is the interfacial capacitance (frequency independent) and R i is the interfacial resistance [53,54]. The resistance decreases as the frequency increases, at frequencies lower than the radio frequency range, where space charges are accumulated at interfaces.…”

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 99%

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Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

Ibrahim

Darwish

Gomaa

2011

J Mater Sci: Mater Electron

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The present paper reports the influence of Ag 2 O addition at the expense of Li 2 O on the local structure of xAg 2 OÁ(30 -x)Li 2 OÁ10Fe 2 O 3 Á10SiO 2 Á50P 2 O 5 glass matrix (with x = 0, 0.5, 1, 1.5 and 2 mol %). The phosphate structural units of the network former are assessed from Fourier transform infrared (FT-IR) spectroscopy. The addition of Ag 2 O to the glass network matrix B1 mol % leads to the occurrence of a depolymerization process of the phosphate structure and consequently, to the appearance of a distortion of the PO 4 tetrahedra. When the content of Ag 2 O is increased from 1.5 up to 2 mol %, a remarkable polymerization process has been observed. The density, molar volume, microhardness and chemical durability have been investigated in order to study the effect of Ag 2 O/Li 2 O replacements on the physicochemical properties the studied glasses. The AC electrical properties are affected to a great extent with composition. These results are related to the internal structure of the glass samples. The conductivity, dielectric constant and dielectric loss of the studied glasses were studied using the frequency response in the interval 100 Hz-100 kHz and the effect of compositional changes on the measured properties was investigated. Measurements showed that the electrical responses of glass samples were different and complex for interpretation. The increase of Ag 2 O addition at the expense of Li 2 O contents (from 0 to 1 mol %) led to increase the conductivity, dielectric constant and dielectric losses of samples. The addition of more Ag 2 O at the expense of Li 2 O (from 1.5 to 2 mol %), resulting into decreasing the conductivity, the dielectric constant and dielectric losses of the studied glasses. The experimental data of the glass samples were argued to the internal structure of the glasses and the nature and role-played by weakening or increasing the rigidity of the structure of the sample. It could be concluded, therefore, that the AC electrical properties of the samples were influenced by the distribution of its constituents, connectivity, and number of free charges.

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Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 90%

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 99%

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 99%

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Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

Ibrahim

Darwish

Gomaa

2011

J Mater Sci: Mater Electron

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“…This is an important issue because the electric characteristics of these samples, beyond the glass matrix and the crystalline particles are dependent of the network modifiers ions. It is known that in glasses containing Fe ions, the electrical conduction mechanism is mainly electronic [18]. Nevertheless, the electrical conductivity in lithium ferrite may exhibit ionic conductivity, in addition to electronic conductivity [14], as it contains Li + ions [16].…”

Section: Discussionmentioning

confidence: 99%

Dielectric and structural properties of SiO2-LiFe5O8 glass–ceramics prepared by sol–gel processing

Graça

Silva

Costa

et al. 2010

Journal of Non-Crystalline Solids

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“…7 that the conductivity at higher frequencies is higher for 11BBS as compared to the other samples. The electrical conductivity and dielectric constant, in general, depends on the number of free or bond charge carriers and their mobility [23]. The hexa-coordinated Al 3?…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Synthesis and characterization of barium borosilicate glass–Al2O3 composites

Santha

Nideep

Rejisha

2011

J Mater Sci: Mater Electron

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Barium borosilicate glass with composition 30BaO-60B 2 O 3 -10SiO 2 glass was prepared by meltquenching technique. Different weight % of crystalline Al 2 O 3 was mixed with the glass powder and sintered at optimum temperature. The changes in the structure and thermal properties of the glass with alumina content were investigated by X-ray powder diffraction, FT-IR spectroscopy and differential thermal analysis. The variations in the coefficient of thermal expansion and dielectric properties with composition were also studied and correlated with the structural changes.

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Electrical properties of some Y2O3 and/or Fe2O3-containing lithium silicate glasses and glass-ceramics

Cited by 27 publications

References 20 publications

Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

Dielectric and structural properties of SiO2-LiFe5O8 glass–ceramics prepared by sol–gel processing

Synthesis and characterization of barium borosilicate glass–Al2O3 composites

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