Effect of the content of Al 2 O 3 on structure and properties of calcium-phosphate glasses: Two experimental case studies

Liu, Hongting; Lu, Yucheng; Qu, Yanbin; Lü, Hao; Yue, Yunlong

doi:10.1016/j.jnoncrysol.2016.07.043

Cited by 30 publications

(7 citation statements)

References 25 publications

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“…Phosphate glasses may be used for a variety of uses, including bone transplantation, hazardous waste containment, high electron conductors, laser host components, low-temperature seals, metallic seal materials, bioglasses, diametric purposes, and solid state electrolytes, among others [4][5][6][7]. ey have significant physical properties, such as a low melting temperature, high heat transfer coefficient, high ultraviolet transmission, lower glass transition temperature, minimum softening temperature, high ionic conductivity, and biocompatibility [8].…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

Kassa

Tesfaye

Bulcha

et al. 2021

Advances in Materials Science and Engineering

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The melt-quenching technique was used to produce 39CdO–10Al2O3-(51-x) P2O5: xMnO glasses (x = 0, 0.1, 0.2, 0.3, and 0.4 wt.%). Various stability factors were calculated and presented from DTA analysis. The stability of the glass network appears to increase with the increase of MnO concentration, according to the findings. IR spectral analysis of these glasses exhibited several symmetrical and asymmetrical bands due to phosphate groups. The observed change in these band intensities with the rise in MnO concentrations, ranging from 0.1 wt.% to 0.4 wt.%, shows an increase in the stability of the glass network. Optical absorption analyses of these glasses revealed an absorption band that shifted from 500 to 488 nm as the concentration of manganese oxide (MnO) increased from 0.1 wt.% to 0.4 wt.%, indicating that Mn2+ ions were gradually converted into Mn3+ ions. EPR spectra of these glasses were characterized by two signals due to Mn2+ and Mn3+ ions. Observations on these signal intensity variations revealed an increase in stability of the glass network with the increase of MnO concentration from 0.1 wt.% to 0.4 wt.%. Parameters, which describe the insulating characteristics, for example, dielectric constant, ε, dielectric loss, tan δ, and AC conductivity σac, were determined in relation to frequency (103 Hz to 105 Hz) and temperature (20°C to 400°C) and presented in the dielectric analysis of these glasses.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

Kassa

Tesfaye

Bulcha

et al. 2021

Advances in Materials Science and Engineering

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“…Previous studies have shown that Al 2 O 3 tends to act as network former in glass structure with the increased ratio of Na 2 O/SiO 2 in glass . When Al 3+ ions entered into glass network as four coordination, Al 2 O 3 consumed the nonbridging oxide and formed [AlO 4 ] tetrahedron to enhance the network structure, which has been proved by previous studies . The extra negative charge need one Na + ion to balance the valence state, leading Na + moved to Al‐silicate regions from alkalis‐enriched regions.…”

Section: Resultsmentioning

confidence: 62%

“…For the influence of Al 2 O 3 on the glass network structure, Mohini et al have observed that unlike [AlO 6 ] structural units, presence of Al in tetrahedral configuration (

[{AlO}_{4}^{-}

] structural units) decreases the extent of degradation of Al 3+ ions containing borosilicate glass . Al 2 O 3 in the glass can break the Si–O and the formation of new Si–O–Al, which can make the glass structure more compact . Besides, the Al 2 O 3 will take part in the glass structure mainly as the types of [AlO 4 ] and [AlO 6 ] .…”

Section: Introductionmentioning

confidence: 99%

“…Al 2 O 3 in the glass can break the Si–O and the formation of new Si–O–Al, which can make the glass structure more compact . Besides, the Al 2 O 3 will take part in the glass structure mainly as the types of [AlO 4 ] and [AlO 6 ] . However, the relationship between the formation of independent

{Se}_{2}^{-}

color centers or Se‐related QDs and glass structure changes induced by Al remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al₂O₃ on the formation of color centers and CdSe/Cd₁₋_xZn_xSe quantum dots in SiO₂–Na₂O–ZnO glasses

Xia

Liu

et al. 2018

J Am Ceram Soc

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Se2− color centers and CdSe/Cd1−xZnxSe quantum dots (QDs) were formed in silicate glasses, respectively, by carefully adjusting the content of Al2O3. The absorption coefficient and broad visible emission at 400‐700 nm of Se2− color centers increased firstly and then decreased upon increasing concentration of Al2O3 from 0 to 5 mol. %. With 2 mol. % Al2O3 adding, the band edge emission centered at 497 nm from CdSe QDs in glasses was observed after heat treatment. Raman spectra and TEM characterization confirmed the formation of CdSe/Cd1−xZnxSe QDs. The small amount addition of Al2O3 had a significant effect on the formation of Se2− color centers and precipitation of CdSe/Cd1−xZnxSe QDs in glasses due to its complicated effect on the network structure and optical basicity of the glasses.

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“…However, phosphate-based glass hosts notable for their high metal solubility, low-melting character, relatively low glass transition temperature, and high thermal stability are promising materials in the ield of photonics [13,15]. In these, the addition of aluminium oxide as a less acid network former results in a strengthened glass network with improved chemical durability and thermo-mechanical stability [16][17][18]. In addition, co-doping with SnO is believed Abstract The optical properties of Eu 3+ -doped aluminophosphate glass containing a high concentration of Ag 2 O and SnO co-dopants (8 mol% of each) are reported.…”

mentioning

confidence: 99%

Optical Properties of Eu3+-Doped Aluminophosphate Glass with a High Concentration of Silver and Tin

Jiménez

2016

J Inorg Organomet Polym

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last decades in search of improvements in the luminescent properties of europium given its relevance for optical device applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. Malta et al. [1] irst reported that an improved photoluminescence (PL) of Eu 3+ ions in glass containing Ag nanoparticles (NPs) occurred due to the surface plasmon resonance (SPR) of the silver particles.Other groups subsequently concluded similarly on the role of local-ield efects of plasmonic Ag particles amplifying Eu 3+ PL in glasses [2,3,5,10,11,13]. On the other hand, several other studies have added to the discussion with respect to the conditions and mechanisms by which Eu 3+ emission is enhanced by the presence of silver [4,[6][7][8][9]12]. Namely, ionic metal species have been argued to be at the origin of energy transfer processes leading to a sensitized Eu 3+ PL rather than the Ag NPs themselves. Moreover, the NPs have been reported to instead lead to an eicient PL quenching of the rare-earth ions [4, 6] through an energy transfer/deactivating efect recently referred to as the plasmonic diluent efect [14]. Hence, achieving the desired enhanced optical properties is not straightforward. Moreover, it requires signiicant research eforts towards understanding the fundamental interactions between europium ions and the diferent oxidation and aggregation states of silver.Silicate [1-3, 7, 9, 12], borate [8], tellurite [10,11], and germanate [5] glasses were often the object of investigation regarding the interaction between europium and silver species. However, phosphate-based glass hosts notable for their high metal solubility, low-melting character, relatively low glass transition temperature, and high thermal stability are promising materials in the ield of photonics [13,15]. In these, the addition of aluminium oxide as a less acid network former results in a strengthened glass network with improved chemical durability and thermo-mechanical stability [16][17][18]. In addition, co-doping with SnO is believed Abstract The optical properties of Eu 3+ -doped aluminophosphate glass containing a high concentration of Ag 2 O and SnO co-dopants (8 mol% of each) are reported. Glass preparation is carried out by melt-quenching, and a subsequent in situ monitored heat treatment (HT) is carried out for the reduction of ionic silver to Ag nanoparticles (NPs) via reducing agent tin(II). An enhanced ultraviolet broadband excitation range for Eu 3+ ions is realized for the meltquenched glass, likely due to the creation of molecule-like silver species such as Ag + -Ag + dimers. The real-time optical monitoring of the glass during isothermal HT shows the steady development of the surface plasmon resonance peak of Ag NPs near 420 nm. Concurrently exciting Eu 3+ ions in situ at 420 nm unveils the plasmonic diluent efect manifested through the quenching of Eu 3+ luminescence. The decay times of the 5 D 0 emitting state in Eu 3+ ions in the melt-quenched and NP-doped glasses are measured and discussed.

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Effect of the content of Al 2 O 3 on structure and properties of calcium-phosphate glasses: Two experimental case studies

Cited by 30 publications

References 25 publications

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

Effect of Al₂O₃ on the formation of color centers and CdSe/Cd₁₋_xZn_xSe quantum dots in SiO₂–Na₂O–ZnO glasses

Optical Properties of Eu3+-Doped Aluminophosphate Glass with a High Concentration of Silver and Tin

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Effect of the content of Al 2 O 3 on structure and properties of calcium-phosphate glasses: Two experimental case studies

Cited by 30 publications

References 25 publications

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

Effect of Al2O3 on the formation of color centers and CdSe/Cd1−xZnxSe quantum dots in SiO2–Na2O–ZnO glasses

Optical Properties of Eu3+-Doped Aluminophosphate Glass with a High Concentration of Silver and Tin

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Effect of Al₂O₃ on the formation of color centers and CdSe/Cd₁₋_xZn_xSe quantum dots in SiO₂–Na₂O–ZnO glasses