Development of oxyfluoroborate glass ceramics doped with Er3+ and Yb3+

Chialanza, Mauricio Rodríguez; Keuchkerian, Romina; Maia, Lauro J. Q.; Carvalho, J. F.; Suescun, Leopoldo; Faccio, Ricardo; Fornaro, L.

doi:10.1007/s10854-017-8514-x

Cited by 2 publications

(11 citation statements)

References 31 publications

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“…The stability of glass phase against crystallization (evaluated in terms of T x − T g ) follows the same trend as T g variation, as was demonstrated for barium borate over a wide range of compositions . In our case, despite the glass transition showing the expected variation for the ionic radius for x = 10% (where T g for Ca > Sr > Ba) and a decrease in its value as the concentration of PbF 2 increases for each cation, the glass stability does not show a clear dependence with the concentration of PbF 2 for all the cations studied. For example, for barium sample, T x − T g values follow the following order 10% > 30% > 20%.…”

Section: Discussionsupporting

confidence: 86%

“…As was previously mentioned, the value of T g is dependent on the presence of different cation modifiers . The stability of glass phase against crystallization (evaluated in terms of T x − T g ) follows the same trend as T g variation, as was demonstrated for barium borate over a wide range of compositions .…”

Section: Discussionsupporting

confidence: 82%

“…The substitution of CaO for CaF 2 in alumina silicate glass produces a great decrease in the T g value (from 775°C to 590°C) and was explained by the difference in its chemical bond strength between CaO and CaF 2 . On the other hand, the variation in the cation modifier for the diborate composition produces a variation in T g value, in agreement with results discussed previously . For that reason, crystallization studies were performed.…”

Section: Discussionmentioning

confidence: 83%

“…The glass was heated up to temperatures near their glass transition temperature to release stress and thereafter the glass was stored in a desiccator. As we mentioned before, as the content of PbF 2 increases, the glass tends to crystallize or segregate into two phases. For that reason, Sr sample with 30% of PbF 2 and Ca samples with 20% and 30% of PbF 2 were not used in this study.…”

Section: Methodsmentioning

confidence: 99%

“…The differences between borate and silicate glass have been extensively studied in the past . Using this body of knowledge, borate glass and glass ceramics could be converted into active materials that present fascinating properties that could be used for applications in solid‐state lighting, up‐conversion, dosimetry, between others.…”

Section: Introductionmentioning

confidence: 99%

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Structural analysis of oxyfluoride borate glass and BaF₂ crystallization from phase separation

Chialanza¹,

Schneider

Keuchkerian³

et al. 2020

J Am Ceram Soc

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Oxyfluoride glass and glass‐ceramics are being studied due to the possibility of their utilization in many applications, such as thermoluminescent dosimeters, optical fibers, fluorescent concentrators, and temperature sensors. In order to improve the properties of glass, they are often crystallized. For this crystallization to be effective, knowledge and control of the structure of the starting material is required. Much work was done on silicate glass; however, a great interest exists in obtaining these kinds of materials in other matrices such as germanates, phosphates, and borates. Here, we present a structural study of some oxyfluoride borate glass with different concentrations of PbF2 by means of Nuclear Magnetic Resonance (NMR), Raman, and Fourier Transform Infrared (FTIR) spectroscopies. We also analyzed glass‐crystallization using Differential Scanning Calorimetry (DSC). The crystallization study was complemented with the use of Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED), for the purpose of identifying possible mechanisms of crystallization. Our results indicate, from the structural point of view, that the glass present groups with one or two BO4 species, such as diborate or pentaborate. The small variation in the BO4 fraction with the increase in PbF2 concentration would be an indication of the formation of F−BO3/2 species. Oxyfluoride borate glass containing BaO as a cation modifier and 30% PbF2 represents a good starting point for obtaining glass‐ceramics with a narrow size distribution of BaF2 nanocrystals. We also propose that the possible mechanism for oxyfluoride borate glass crystallization started with a separation of phases.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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