Structure of NaF–TeO2 glasses and glass-ceramics

E.F. El Agammy; H. Doweidar; K. El-Egili; R. Ramadan; Mariusz Jaremko; Abdul-Hamid M. Emwas

doi:10.1016/j.ceramint.2020.04.161

Structure of NaF–TeO2 glasses and glass-ceramics

E.F. El Agammy, H. Doweidar, K. El-Egili, R. Ramadan, Mariusz Jaremko, Abdul-Hamid M. Emwas

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Abstract

The structure of NaF–TeO2 glasses and glass-ceramics has been studied by XRD, TEM, SEM, Raman and FTIR techniques. The results suggest that, for NaF ≤10 mol%, the entire NaF content enters the structure to convert TeO4 units into TeO3/2F and Na+[TeO3+1]– units. It has also been shown that NaF partially forms amorphous and/or crystalline phases for higher NaF content, where the relative concentration of each phase depends on the NaF content. SEM images show agglomerates of different sizes, which are discrete and spread within the structure. XRD revealed formation of crystalline Te2O3F2 for NaF ≤50 mol%, and a dominant phase of crystalline NaF for NaF >50 mol%. Raman and FTIR spectra have been analyzed to calculate the concentrations of the various structural units in glasses and glass-ceramics.

Original language	English (US)
Journal	Ceramics International
DOIs	https://doi.org/10.1016/j.ceramint.2020.04.161
State	Published - Apr 20 2020

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https://repository.kaust.edu.sa/bitstream/10754/662607/1/Structure%20of.pdf

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title = "Structure of NaF–TeO2 glasses and glass-ceramics",

abstract = "The structure of NaF–TeO2 glasses and glass-ceramics has been studied by XRD, TEM, SEM, Raman and FTIR techniques. The results suggest that, for NaF ≤10 mol%, the entire NaF content enters the structure to convert TeO4 units into TeO3/2F and Na+[TeO3+1]– units. It has also been shown that NaF partially forms amorphous and/or crystalline phases for higher NaF content, where the relative concentration of each phase depends on the NaF content. SEM images show agglomerates of different sizes, which are discrete and spread within the structure. XRD revealed formation of crystalline Te2O3F2 for NaF ≤50 mol%, and a dominant phase of crystalline NaF for NaF >50 mol%. Raman and FTIR spectra have been analyzed to calculate the concentrations of the various structural units in glasses and glass-ceramics.",

author = "{El Agammy}, E.F. and H. Doweidar and K. El-Egili and R. Ramadan and Mariusz Jaremko and Emwas, {Abdul-Hamid M.}",

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language = "English (US)",

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TY - JOUR

T1 - Structure of NaF–TeO2 glasses and glass-ceramics

AU - El Agammy, E.F.

AU - Doweidar, H.

AU - El-Egili, K.

AU - Ramadan, R.

AU - Jaremko, Mariusz

AU - Emwas, Abdul-Hamid M.

N1 - KAUST Repository Item: Exported on 2020-10-01

PY - 2020/4/20

Y1 - 2020/4/20

N2 - The structure of NaF–TeO2 glasses and glass-ceramics has been studied by XRD, TEM, SEM, Raman and FTIR techniques. The results suggest that, for NaF ≤10 mol%, the entire NaF content enters the structure to convert TeO4 units into TeO3/2F and Na+[TeO3+1]– units. It has also been shown that NaF partially forms amorphous and/or crystalline phases for higher NaF content, where the relative concentration of each phase depends on the NaF content. SEM images show agglomerates of different sizes, which are discrete and spread within the structure. XRD revealed formation of crystalline Te2O3F2 for NaF ≤50 mol%, and a dominant phase of crystalline NaF for NaF >50 mol%. Raman and FTIR spectra have been analyzed to calculate the concentrations of the various structural units in glasses and glass-ceramics.

AB - The structure of NaF–TeO2 glasses and glass-ceramics has been studied by XRD, TEM, SEM, Raman and FTIR techniques. The results suggest that, for NaF ≤10 mol%, the entire NaF content enters the structure to convert TeO4 units into TeO3/2F and Na+[TeO3+1]– units. It has also been shown that NaF partially forms amorphous and/or crystalline phases for higher NaF content, where the relative concentration of each phase depends on the NaF content. SEM images show agglomerates of different sizes, which are discrete and spread within the structure. XRD revealed formation of crystalline Te2O3F2 for NaF ≤50 mol%, and a dominant phase of crystalline NaF for NaF >50 mol%. Raman and FTIR spectra have been analyzed to calculate the concentrations of the various structural units in glasses and glass-ceramics.

UR - http://hdl.handle.net/10754/662607

UR - https://linkinghub.elsevier.com/retrieve/pii/S0272884220311056

U2 - 10.1016/j.ceramint.2020.04.161

DO - 10.1016/j.ceramint.2020.04.161

M3 - Article

SN - 0272-8842

JO - Ceramics International

JF - Ceramics International

ER -

Structure of NaF–TeO2 glasses and glass-ceramics

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