Structural features of lead iron phosphate glasses

Reis, Signo Tadeu Dos; Faria, Dalva Lúcia Araújo de; Martinelli, J.R.; Pontuschka, W. M.; Day, Delbert E.; Partiti, C. S. M.

doi:10.1016/s0022-3093(02)01021-9

Cited by 85 publications

(70 citation statements)

References 24 publications

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“…These results suggest that there is a decrease in the concentration of free charge carriers that build up space-charge polarization [37,38]. The gradual increase of these parameters with increasing content of Ag 2 O from 0.5 to 1 mol %, suggests a greater degree of disorder in the glass network that enhances space charge polarization.…”

Section: Electrical Properties Of the Studied Samplesmentioning

confidence: 99%

“…This region may also consist of bands due to pyrophosphate groups (P 2 O 7 4-) [37]. The band at 512 cm -1 is described as a fundamental frequency of PO 4 3-species of phosphate glasses or as harmonics of P-O bending vibration [38]. The band at 485 cm -1 is attributed to deformation modes of different fragments of structure units [39] or FeO 6 .…”

Section: Ft-ir Spectroscopymentioning

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: 99%

Section: Ft-ir Spectroscopymentioning

confidence: 99%

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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“…Marasinghe et.al [30] have carried out a study on the investigation of the local iron environment in iron phosphate glasses. Martinelli et.al [31] have studied the structural features of lead iron phosphate glasses. Santic et.al [32] have investigated the dc electrical conductivity of iron phosphate glasses.…”

Section: Brief Review Of the Previous Work On The Glasses Containmentioning

confidence: 99%

Induced crystallization and structural aspects of PbO-As2O3 glass system doped with Fe2O3

Kumari¹

2014

IOSRJAP

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“…The phosphate units which form chains, rings or isolated PO 4 groups. The structure of phosphate glasses is usually described in terms of Q n groups.…”

Section: Introductionmentioning

confidence: 99%

Structural investigation of MO⋅P2O5⋅Li2O (MO = Fe2O3 or V2O5) glass systems by FTIR spectroscopy

Andronache

Racolta

2014

AIP Conference Proceedings

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Raman spectroscopic investigation of the structure of silicate glasses. I. The binary alkali silicates The Journal of Chemical Physics 63, 2421 (1975) Abstract. Glasses from the systems xMO prepared in the same conditions and characterized by IR spectroscopy. It was established the mode in which and V 2 O 5 influences the local structure of these glasses. The iron ions generally modify in a different way the local structure of these glasses then vanadium ions. The results shown that phosphate units are the main structural units of glass system and the iron and vanadium ions are located in the network. Keywords: IR, glass, PhosphateThe structure of binary phosphate glasses has been studied by IR absorption spectroscopy. The phosphate network is base on corner-sharing PO 4 units which form chains, rings or isolated PO The structure of phosphate glasses is usually described in terms of Q tetrahedra, n indicates the number of bridging oxygens atoms and depends on the degree of condensa

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Structural features of lead iron phosphate glasses

Cited by 85 publications

References 24 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

Induced crystallization and structural aspects of PbO-As2O3 glass system doped with Fe2O3

Structural investigation of MO⋅P2O5⋅Li2O (MO = Fe2O3 or V2O5) glass systems by FTIR spectroscopy

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