Chemical durability and Structural approach of the glass series (40-y) Na2O-yFe2O3-5Al2O3-55P2O5-by IR, X-ray diffraction and Mössbauer Spectroscopy

Aqdim, Said; Sayouty, E.H.; Elouad, B; Grenèche, Jean‐Marc

doi:10.1088/1757-899x/28/1/012003

Cited by 11 publications

(13 citation statements)

References 14 publications

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“…These results agree with those obtained by X-ray diffraction. Hence, these results indicate that iron phosphate glasses which have a high Fe 2 O 3 content are dominated by P 2 O 7 4− and (PO 3 ) 3 3− dimer units and contain a large number of Fe-O-P bonds which are responsible for theirexcellent chemical durability [16,[30][31]. The X-ray diffraction and IR spectra for the iron phosphate glasses depend considerably on the composition and glass structure.…”

Section: Discussionmentioning

confidence: 82%

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Aqdim¹,

Ouchetto²

2013

AMPC

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The regular melting-quenching method allowed isolating very large vitreous domains within the ternary system Li 2 O-P 2 O 5-Fe 2 O 3 at 1100˚C. The vitrification and crystallization effects are discussed in terms of phosphorus pentaoxide concentration (mol%). In the course of the present study, we analyzed chemical durability along the glass domain and many sample glasses were isolated. We noticed that our compounds demonstrated very high chemical resistance to attack, even with very highly concentrated mineral acid solutions. This behavior can be assigned to the presence of poorly crystalline phases in these glasses, which tended to increase as the Fe 2 O 3 content increased. This property is a prerequisite for many interesting industrial applications. XRD, IR spectroscopy and SEM micrographs allowed an efficient investigation of the structural changes versus composition within ternary diagrams. The results were found to be consistent with the regular structural changes of phosphate glasses.

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Section: Discussionmentioning

confidence: 82%

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Aqdim¹,

Ouchetto²

2013

AMPC

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“…This structural change enhances the formation of metaphosphate and/or rings of metaphosphate groups, with some pyrophosphate groups, confirmed by X-ray diffraction and I.R spectroscopy [15]. The X-ray diffraction patterns of S 1 and S 4 , heated to 550˚C and 650˚C, respectively, illustrate the formation of crystalline phases Zn(PO 3 ) 2 [5].…”

Section: Discussionmentioning

confidence: 64%

“…The vibration bands at around 1100 and 1000 cm −1 are characteristic of terminal PO 3 − groups [12]. In addition, the band at 884 -890 cm −1 shifts to a low wavenumber due to the asymmetric vibration ν as (P-O-P) while the band at 753 cm −1 is attributed to symmetric vibration νs (P-O-P) groups bridging oxygen atoms bonded to a phosphorus atom in a Q 2 phosphate tetetrahedron [12] [14] [15]. The spectrum of C 4 P 6 O 19 shows a strong vibration in the region around 696 -733 cm −1 [5] [10] with a CaO content ≤ 15 mol%.…”

Section: Infrared Spectramentioning

confidence: 99%

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na2O-45P2O5

Chabbou¹,

Aqdim²

2014

AMPC

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The influence of CaO on the glass forming characteristics and properties of Na2O-CaO-ZnO-P2O5 glasses has been investigated. According to the studies that we performed on phosphate based glass within system xCaO-(40-x)ZnO-15Na2O-45P2O5 (10 ≤ x ≤ 30; mol%), it was found that the increase of CaO and substitution of ZnO can give a good chemical durability. Both Cristallographies X-ray and IR spectroscopy have confirmed the structure change when the CaO content increases in the glass. This change results in the formation of metaphosphate and/or rings of metaphosphate groups at the expense of pyrophosphate. So it indicates the formation of Ca-O-P bonds in the network glass that replaces hydrated P-O-Na and P-O-P bands. The phosphate chains units can be bonded together in rings forming meta-phosphate groups. These rings likely lead to the formation of agglomerates of crystalline phases, which is the main cause of the increase in the chemical durability of the glasses when the CaO content increases. The latter may lead to wider use of these materials, especially in the biomedical field.

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“…The chemical durability of the glass series 55P 2 O 5 -2Cr 2 O 3 -(43-x) Na 2 O-xPbO (with 8 ≤ x ≤ 38 mol %) was de-termined by measuring the dissolution rate (D R ) of glasses immersed for 20 consecutive days in 100 ml of distilled water heated to 90˚C [6] [10]. The dissolution rate is defined as the loss of weight of the glass expressed in g•cm −2 •min −1 .…”

Section: Chemical Durabilitymentioning

confidence: 99%

“…The band at 500 -510 cm −1 is assigned to the deformation of the skeleton δ ske (P-O-P) [11]. The band at 730 -750 cm −1 is assigned to the symmetric stretching ν sym (P-O-P) phosphorus bridge tetrahedral [6], while the bands at 870 -900 and 975 -980 cm −1 are assigned respectively to the vibration of asymmetric ν asym (P-O-P) and ν s 3 4…”

Section: Infrared Spectramentioning

confidence: 99%

Correlation between Chemical Durability Behaviour and Structural Approach of the Vitreous Part of the System 55P2O5-2Cr2O3-(43-x) Na2O-xPbO

Beloued¹,

Chabbou²,

Aqdim³

2016

AMPC

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Various characterisation techniques were used to study the composition of the glass series 55-P 2 O 5-2Cr 2 O 3-(43-x) Na 2 O-xPbO (with 8 ≤ x ≤ 38; mole %) in terms of chemical durability, IR spectroscopy and scanning electron microscopy (SEM). The change in the dissolution rate as a function of time when the studied glasses were kept submerged in distilled water at 90˚C for 20 days showed an improvement in the chemical durability when Na 2 O content was substituted to PbO content. IR spectroscopy revealed a structural change from ultraphosphate groups to pyrophosphate, orthophosphate and probably ring metaphosphate groups. SEM revealed the existence of two phases: a vitreous phase and a crystalline phase. The presence of Cr 2 O 3 , even in small amounts, seems to play an important role in the formation of crystallites in the glass network. The improved chemical durability is attributed to the replacement of the easily hydrated Na-O-P and P-O-P bonds by covalent and resistant Pb-O-P bands. Both the increase in PbO content and in the Pb + Cr/P ratio causes an increase in the number of covalent Pb-O-P and Cr-O-P bonds, making the glass structure more rigid. The increase of the covalent Pb-O-P bands leads to a clear evolution of the structure and chemical resistance, caused by grain-boundary resistance as a result of glass crystallisation. The IR spectra indicate that the increase in PbO content favours the formation of isolated 3 4 * Corresponding author. N. Beloued et al. 150 limit, the equilibrium between the glass bath and these crystallites is no longer maintained; we notice, once, a decrease in the chemical durability.

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Chemical durability and Structural approach of the glass series (40-y) Na₂O-yFe₂O₃-5Al₂O₃-55P₂O₅-by IR, X-ray diffraction and Mössbauer Spectroscopy

Cited by 11 publications

References 14 publications

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na<sub>2</sub>O-45P<sub>2</sub>O<sub>5</sub>

Correlation between Chemical Durability Behaviour and Structural Approach of the Vitreous Part of the System 55P<sub>2</sub>O<sub>5</sub>-2Cr<sub>2</sub>O<sub>3</sub>-(43-x) Na<sub>2</sub>O-xPbO

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Chemical durability and Structural approach of the glass series (40-y) Na2O-yFe2O3-5Al2O3-55P2O5-by IR, X-ray diffraction and Mössbauer Spectroscopy

Cited by 11 publications

References 14 publications

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Elaboration and Structural Investigation of Iron (III) Phosphate Glasses

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na&lt;sub&gt;2&lt;/sub&gt;O-45P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;

Correlation between Chemical Durability Behaviour and Structural Approach of the Vitreous Part of the System 55P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;-2Cr&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-(43-x) Na&lt;sub&gt;2&lt;/sub&gt;O-xPbO

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Chemical durability and Structural approach of the glass series (40-y) Na₂O-yFe₂O₃-5Al₂O₃-55P₂O₅-by IR, X-ray diffraction and Mössbauer Spectroscopy

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na<sub>2</sub>O-45P<sub>2</sub>O<sub>5</sub>

Correlation between Chemical Durability Behaviour and Structural Approach of the Vitreous Part of the System 55P<sub>2</sub>O<sub>5</sub>-2Cr<sub>2</sub>O<sub>3</sub>-(43-x) Na<sub>2</sub>O-xPbO