Structure and some physical properties of PbO–P2O5 glasses

El-Egili, K.; Doweidar, H.; Moustafa, Yasser M.; Abbas, I. M.

doi:10.1016/j.physb.2003.07.005

Cited by 139 publications

(60 citation statements)

References 17 publications

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“…The density value of Na 2 B 4 O 7 glass agrees well with that reported by Kodama [15]. The density values of the studied glasses are greater than the density value for pure B 2 O 3 (1838 kg/m 3 ) [15] and agree with a reported data elsewhere [24,33,36]. The increase in the density is related to the high dense PbO (9350 kg/m 3 ) compared to that of Na 2 B 4 O 7 [21,24,34], i.e., the increase in the density is related to the constitution of the glass rather than to the type of the structural unit, as observed earlier [37].…”

Section: Density and Molar Volumesupporting

confidence: 92%

Structural and acoustical studies of lead sodium borate glasses

Saddeek

2009

Journal of Alloys and Compounds

145

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Section: Density and Molar Volumesupporting

confidence: 92%

Structural and acoustical studies of lead sodium borate glasses

Saddeek

2009

Journal of Alloys and Compounds

145

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“…As can be seen, the IR spectra are dominated by the vibrational modes of the phosphate tetrahedral. A strong broad absorption occurring between 3,200 and 3,400 cm −1 and a weaker one in the region of 1,600-1,660 can be assigned to the stretching and bending of the OH bonds, respectively [10,12,13]. The incorporation of water in the glasses might possibly happen during the preparation of the pellets for infrared measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The absorption band at 480-508 cm −1 is assigned to harmonics of bending vibration of O=P-O linkages. The weak absorption band cited at 809-776 cm −1 is attributed to the bending vibration of P-O-P linkage [10].…”

Section: Resultsmentioning

confidence: 99%

“…Lithium oxide has been used as a constituent in phosphate glasses in order to achieve useful physical properties. Although it is not a glass-forming oxide by itself, it can be incorporated in substantial quantities into other glass-forming oxide systems such as SiO 2 , B 2 O 3 and P 2 O 5 [10]. The present work investigates the variation of the optical and electrical properties of the phosphate glasses as LiCl are introduced into the glasses, which acts as a modifier in the P 2 O 5 network glass.…”

Section: Introductionmentioning

confidence: 99%

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Optical and electrical characteristics of (LiCl) x (P2O5)1 − x glass

Talib

Daud

Loh

et al. 2008

Ionics

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Homogeneous (LiCl) x (P 2 O 5 ) 1 − x glasses were synthesised using a melt-quenching method for x=0.1-0.6 in the interval of 0.05. The amorphous structure of the samples was evident by the X-ray diffraction spectrum. The short range structures of the binary phosphate samples were examined by Fourier transform infrared spectroscopy, whilst the density of the samples was measured as supportive data for the investigations. The results of refractive indices as measured using an ellipsometer reveal the homogeneity of samples and was found to depend on the glass composition. The electrical properties of the glasses were investigated by ac impedance spectroscopy from 10 mHz to 1 MHz for temperatures ranging from room temperature to 573 K. An estimation of the bulk resistivity was obtained by taking the intercepts on the real axis at low frequencies of the complex impedance plot. The dc conductivities derived from the reciprocal of resistivity values were found to obey the Arrhenius relationship, and its activation energy shows a decreasing trend with the increase in LiCl content in the glass. Lastly, an equivalent circuits consisting of real and complex capacitors is proposed to describe the dielectric response of the glass.

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“…Finally, Q 0 is referred to isolated and less shielded phosphate tetrahedral units with three negative charges. The structure of phosphate glasses strongly depends on specific structural factor namely R which represents modifier (M) to phosphor (P) ratio in the glass composition [10] [11] [12]. The metaphosphate (Q Many of previous studies were carried out on phosphate glasses modified by alkali or alkaline earth oxides in the region of ultra, meta and pyrophosphate [2] [3] [17] [18] [19].…”

Section: Introductionmentioning

confidence: 99%

Structural Studies on Ag2O-P2O5 Glasses

El-Damrawi¹,

Hassan²,

Doweidar³

et al. 2017

NJGC

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Silver phosphate glasses of general formula xAg 2 O•(100 − x)P 2 O 5 have been investigated over compositional range from x = 40 to 62.5 mol%. The local structure around phosphorus atom has been studied via 31 P nuclear magnetic resonance. leads to formation of phosphate groups with specific resonance peaks which are mainly related to pyro and orthophosphate species. The rate of change of the chemical shift of the 31 P NMR depends on the bond type, which in turn reflects the extent of double bonding between phosphorus and oxygen atoms. Increasing concentration of Q 0 with increasing Ag 2 O content leads to decreasing quantities of bridging and double bonds. As a consequence, specific symmetric resonance peak of higher intensity and chemical shift (Q 0 ) is a feature of silver rich glasses (orthophosphate). The latter species is therefore proposed to compose of separated membered rings, which cause deshielding of phosphate units. XRD and EDP studies have shown that, amorphous phosphate network is the dominant structure of glasses containing ≤ 55 mol% Ag 2 O. Some ordered and well crystallized phases are formed at higher Ag 2 O concentration. Increasing non-bridging oxygen atoms is shown to have the main effect on crystallization behavior. Orthophosphate composition is the most crystalline one among the other compositions (ultra, meta-and pyrophosphate). Presence of orthophosphate species which typically contains highest concentration from isolated Q 0 units is the main reason for building up crystalline Ag 3 PO 4 phosphate phase.

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Structure and some physical properties of PbO–P2O5 glasses

Cited by 139 publications

References 17 publications

Structural and acoustical studies of lead sodium borate glasses

Structural and acoustical studies of lead sodium borate glasses

Optical and electrical characteristics of (LiCl) x (P2O5)1 − x glass

Structural Studies on Ag<sub>2</sub>O-P<sub>2</sub>O<sub>5</sub> Glasses

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Structure and some physical properties of PbO–P2O5 glasses

Cited by 139 publications

References 17 publications

Structural and acoustical studies of lead sodium borate glasses

Structural and acoustical studies of lead sodium borate glasses

Optical and electrical characteristics of (LiCl) x (P2O5)1 − x glass

Structural Studies on Ag&lt;sub&gt;2&lt;/sub&gt;O-P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; Glasses

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Structural Studies on Ag<sub>2</sub>O-P<sub>2</sub>O<sub>5</sub> Glasses