SiO2–PbF2–CdF2 glasses and glass ceramics

Silva, M.A.P; Briois, Valérie; Poulain, M.; Messaddeq, Younès; Ribeiro, Sidney J. L.

doi:10.1016/s0022-3697(02)00265-2

Cited by 50 publications

(44 citation statements)

References 24 publications

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“…Additionally the near infrared Er 3+ emission spectra change from the 4 I 13/2 → 4 I 15/2 broad transition, due to the statistical distribution of sites in the glasses, to well resolved lines characteristic of the glass ceramics. 1,2 Figure 2͑a͒ shows the EXAFS k ͑k͒ spectra obtained at the Er L 3 edge of the samples. Figure 2͑b͒ shows the corresponding Fourier transform ͉F͑r͉͒ curves of the EXAFS signals.…”

Section: Resultsmentioning

confidence: 99%

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Local order around rare earth ions during the devitrification of oxyfluoride glasses

Silva

Dantelle

Mortier

et al. 2008

The Journal of Chemical Physics

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Erbium L 3 -edge extended x-ray absorption fine structure ͑EXAFS͒ measurements were performed on rare earth doped fluorosilicate and fluoroborate glasses and glass ceramics. The well known nucleating effects of erbium ions for the crystallization of cubic lead fluoride ͑based on x-ray diffraction measurements͒ and the fact that the rare earth ions are present in the crystalline phase ͑as indicated by Er 3+ emission spectra͒ seem in contradiction with the present EXAFS analysis, which indicates a lack of medium range structural ordering around the Er 3+ ions and suggests that the lead fluoride crystallization does not occur in the nearest neighbor distance of the rare earth ion. Molecular dynamics simulations of the devitrification process of a lead fluoride glass doped with Er 3+ ions were performed, and results indicate that Er 3+ ions lower the devitrification temperature of PbF 2 , in good agreement with the experimental results. The genuine role of Er 3+ ions in the devitrification process of PbF 2 has been investigated. Although Er 3+ ions could indeed act as seeds for crystallization, as experiments suggest, molecular dynamics simulation results corroborate the experimental EXAFS observation that the devitrification does not occur at its nearest neighbor distance.

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Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] This interest can be attributed to two factors. On one hand the erbium ions seem to ease the selective devitrification of ␤-PbF 2 nanoparticles in the transparent glassy matrix, decreasing the amorphous to crystalline phase transition, giving rise to transparent glass ceramics.…”

Section: Introductionmentioning

confidence: 99%

Local order around rare earth ions during the devitrification of oxyfluoride glasses

Silva

Dantelle

Mortier

et al. 2008

The Journal of Chemical Physics

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“…13 ''Modeled'' EXAFS spectra were compared with experimental ones whose conditions for sample preparation, spectra acquisition, and data analysis were detailed in a previous work. 2 …”

Section: Molecular Dynamics Calculations and Exafs Simulationsmentioning

confidence: 99%

“…These mixed systems, composed by a well-known glass former oxide, like SiO 2 , B 2 O 3 , TeO 2 , or GeO 2 and heavy metal fluorides, can be obtained in the glassy state by the conventional melting/quenching technique, at room atmosphere. [1][2][3][4][5] In addition to the relatively simple preparation method and optical characteristics of rare earth doped samples, very interesting devitrification ͑glass crystallization͒ features are presented by these systems. For example, the MO-PbF 2 -CdF 2 systems (MOϭSiO 2 , B 2 O 3 , and GeO 2 ) are characterized by the devitrification of a cubic structure, identified as lead fluoride ␤-PbF 2 , with the possibility of obtaining transparent glass ceramics under controlled thermal treatments.…”

Section: Introductionmentioning

confidence: 99%

“…Cd 1Ϫx Pb x F 2 -type solid solutions were also identified in some devitrified samples. 2 The crystallization processes in glasses have been studied by various generations of glass researchers. The knowledge of the nucleation and crystal growth processes has always been the goal of these scientists due to its importance, in the beginning, to avoid glass crystallization and, nowadays, to control it.…”

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics simulations on devitrification: The PbF2 case

Silva

Monteil

Messaddeq

et al. 2002

The Journal of Chemical Physics

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In this work molecular dynamics simulations were performed to reproduce the kinetic and thermodynamic transformations occurring during melt crystallization, vitrification, and glass crystallization ͑devitrification͒ of PbF 2 . Two potential parameters were analyzed in order to access the possibility of modeling these properties. These interionic potentials are models developed to describe specific characteristic of PbF 2 , and thermodynamic properties were well reproduced by one of them, while the other proved well adapted to simulate the crystalline structure of this fluoride. By a modeled nonisothermal heat treatment of the glass, it was shown that the devitrification of a cubic structure in which the Pb-Pb distances are in good agreement with theory and experiment.

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Oxyfluoride Transparent Glass Ceramics

Mortier

Dantelle

2010

Functionalized Inorganic Fluorides

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SiO2–PbF2–CdF2 glasses and glass ceramics

Cited by 50 publications

References 24 publications

Local order around rare earth ions during the devitrification of oxyfluoride glasses

Local order around rare earth ions during the devitrification of oxyfluoride glasses

Molecular dynamics simulations on devitrification: The PbF2 case

Oxyfluoride Transparent Glass Ceramics

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