Infrared spectra of xCaO(1−x−z)SiO2zP2O5 glasses

Ahsan, M. Rafiqul; Mortuza, M. Golam

doi:10.1016/j.jnoncrysol.2005.05.030

Cited by 71 publications

(24 citation statements)

References 24 publications

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“…In this study, MD simulations were applied to investigate the structure and dynamical properties of the CaO-P 2 O 5 -SiO 2 slag system with varying P 2 O 5 /SiO 2 ratios at a fixed CaO content. Different from the previous work, 17,18) the binary basicity in this study was higher. The following detailed information: bond lengths, partial radial distribution functions (RDFs), coordination numbers (CNs) and the peak value of RDF were investigated mainly to explore the shortrange order while proportions of bridging oxygen (BO), nonbridging oxygen (NBO) and free oxygen (O 2¹ ), degree of polymerization ¡, polymerization constant K p , distributions of Q n and angles were investigated to explore the long-range disorder structure.…”

Section: Introductioncontrasting

confidence: 99%

“…However, most of such previous works related to phosphorus were mainly concentrated on P 2 O 5 -Na 2 O-SiO 2 glasses which was attributed to the wide applications of this system in bioactive materials. 10,11) With regard to the CaO-P 2 O 5 -SiO 2 system, Ahsan 17) studied xCaO· (1 ¹ x ¹ z)·SiO 2 ·zP 2 O 5 glass system through infrared spectra. He proposed that P 5+ occupied the network position and formed the linkage Si-O-P in the glass for higher amount of P 2 O 5 .…”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Analysis of the Microstructure of the CaO-P2O5-SiO2 Slag System with Varying P2O5/SiO2 Ratios

Fan

Diao

et al. 2015

Mater. Trans.

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The structures of the CaO-P 2 O 5 -SiO 2 slag system with varying P 2 O 5 /SiO 2 ratios at a fixed CaO content have been investigated by molecular dynamics simulation using the pairwise potential model. The results showed that the average bond lengths of Si-O and P-O were 1.610 « 0.001 ¡ and 1.531 « 0.005 ¡ in the examined range of the P 2 O 5 /SiO 2 ratio. More than 95% Si and P ions were 4-coordinated and formed tetrahedral structures. Average coordination numbers of P-O and Si-O decreased slightly while average coordination number of Ca-O revealed a rising trend with the addition of P 2 O 5 . The non-bridging oxygens (Si-O-Ca and P-O-Ca) were the overwhelming majority and further increased with the substitution of SiO 2 by P 2 O 5 , which results in the decrease of the polymerization constant K p . The numbers of Si and P groups linked to a tagged Si or P tetrahedron (Q n speciation) characterized the polymerization degree of the slag system. The Q 0 of both P and Si declined remarkably with the increase of P 2 O 5 . Correspondingly, () of Si and P increased observably, implying that the polymerization degree of the slag system was enhanced.

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Section: Introductioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of the Microstructure of the CaO-P2O5-SiO2 Slag System with Varying P2O5/SiO2 Ratios

Fan

Diao

et al. 2015

Mater. Trans.

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“…[3] and Elgayar et al [5]. Previously phosphorus was assumed to enter the glass network forming Si-O-P bonds [42].…”

Section: Density Measurementsmentioning

confidence: 99%

Influence of magnesia on the structure and properties of bioactive glasses

Watts¹,

Hill²,

O’Donnell³

et al. 2010

Journal of Non-Crystalline Solids

248

183

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“…On the other hand, the weak bands observed in the 1000-1100 cm -1 and 1200-1260 cm -1 ranges become broad and intense with increasing P 2 O 5 addition (A/P-ratio \1). The bands in the 1000-1100 cm -1 range are associated with pyrophosphate groups (Q 1 ) [35,36], while those in the 1200-1260 cm -1 range can be assigned to asymmetric stretching of PO 2 bonds of metaphosphate groups (Q 2 ) [35,37].…”

Section: Presence Of Metaphosphate and Pyrophosphate Groupsmentioning

confidence: 99%

“…Wavenumber (cm Table 3 [31,32] 1100 m as (Si-O-P) stretch [35,36] 1123 m as (Si-O), Si-O-Si groups [31,32] 1200-1260 m as (PO 2 ) stretch, Q 2 units [35,37] while 1 % of the total europium concentration could be recovered from the sample with 15 mol% P 2 O 5 addition (region B, Fig. 6).…”

Section: Recovery Of Europiummentioning

confidence: 99%

Rare-Earth Recovery from Soda Lime Silicate Glass Cullet by P2O5 Addition

Hakim

Saitoh

Takebe

2016

J. Sustain. Metall.

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Many rare-earth elements are incorporated into fine glass particles found in glass-polishing sludge and wasted without further exploitation. This study attempts to recover rare-earth element from simulated glass particles. For this purpose, a series of P 2 O 5 concentrations were added to glass cullet doped with Eu 2 O 3 , followed by melting and cooling to room temperature. Recovery of rare-earth element was conducted by leaching into water. Europium was selected as dopant into the opaque samples, and its sensitive fluorescence spectrum utilized to estimate changes in the neighborhood of Eu 3? ions upon P 2 O 5 addition. On the basis of fluorescence and infrared (IR) spectral analysis, it is estimated that significant amounts of Eu 3? ions began to coordinate with PO 4 tetrahedral units when the concentration of P 2 O 5 (P) was higher than the concentration of alkali and alkaline-earth metal oxides (A), expressed as A/P-ratio \1. In this condition, the recovery efficiency of europium element by leaching into water increased to 50-100 % relative to its initial concentration. IR spectra suggested that the increased leaching was promoted by the solubility of metaphosphate chains. This study suggests a process for recovery of rare-earth elements from glass particles found in glass-polishing sludge without use of acid treatment.

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Infrared spectra of xCaO(1−x−z)SiO2zP2O5 glasses

Cited by 71 publications

References 24 publications

Molecular Dynamics Analysis of the Microstructure of the CaO-P<sub>2</sub>O<sub>5</sub>-SiO<sub>2</sub> Slag System with Varying P<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub> Ratios

Molecular Dynamics Analysis of the Microstructure of the CaO-P<sub>2</sub>O<sub>5</sub>-SiO<sub>2</sub> Slag System with Varying P<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub> Ratios

Influence of magnesia on the structure and properties of bioactive glasses

Rare-Earth Recovery from Soda Lime Silicate Glass Cullet by P2O5 Addition

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