Analysis of CaOSiO2 and CaOSiO2CaF2 glasses by Raman spectroscopy

Tsunawaki, Yoshiaki; Iwamoto, Nobuya; Hattori, Takeshi; Mitsuishi, Akiyoshi

doi:10.1016/0022-3093(81)90039-9

Cited by 152 publications

(92 citation statements)

References 12 publications

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“…The spectra of all the prepared glasses exhibit similar spectral feature. As per the reported literature [9], the bands around 1278 cm…”

Section: Resultssupporting

confidence: 81%

“…Many investigators introduced fluorine in oxide based glasses and studied the nature of bonding with the network forming cations using X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (NMR) spectroscopy [9][10][11][12][13]. They suggested that fluorine ions in glass covalently bond with network forming cations for lower fluorine content and bond with calcium ions for higher fluorine content.…”

Section: mentioning

confidence: 99%

“…With increase of fluorine content, the intensity of about 1278 cm 1 band gradually increases due to the polymerization of the phosphate network [9]. Raman band assignments for all the prepared ternary calcium oxyfluorophosphate glasses are summarized in Table 3.…”

Section: 1mentioning

confidence: 99%

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Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Rao

Shashikala

2014

J Adv Ceram

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Abstract:The ternary phosphate glass series (50x)CaO-xCaF 2 -50P 2 O 5 (x = 0-20 mol%) were synthesized using melt quench technique. Structural, optical and mechanical properties were investigated with increase in CaF 2 content. Using X-ray diffraction (XRD), synthesized glasses were confirmed to be amorphous in nature. Replacement of oxygen ions by fluorine ions increased the values of density. Decrease in refractive index due to the low polarizability of fluorine ions in the glass matrix was observed. In Fourier transform infrared (FTIR) spectra, the slight variation in as  (PO 2 ) band position and intensity could be attributed to replacement of fluorine ions for oxygen ions in phosphate glass structure. These data were well supported by Raman spectra. Optical band gap energy increased from 3.44 eV to 3.64 eV with increase in CaF 2 content, and Urbach energy decreased suggesting that the fluorine ions reduced the tail energy states in the band gap compared to the oxygen ions. Mechanical parameters such as Vickers hardness, fracture toughness and brittleness were evaluated from the Vickers micro indentation measurements. Increase in Vickers hardness, decrease in fracture toughness and increase in brittleness were observed with increase in CaF 2 content.

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“…The spectra of all the prepared glasses exhibit similar spectral feature. As per the reported literature [9], the bands around 1278 cm…”

Section: Resultssupporting

confidence: 81%

Section: mentioning

confidence: 99%

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Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Rao

Shashikala

2014

J Adv Ceram

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“…The structure of silicate glasses containing CaF 2 has been predicted from the data obtained by means of viscosity [2][3][4] and cryoscopic measurements, 5) and studied more directly using spectroscopic measurements such as infrared absorption, [6][7][8][9] Raman, 10,11) X-ray photoelectron 12,13) and 19 F nuclear magnetic resonance spectroscopies. 14,15) The conclusions deduced from the above reports can be classified into three conflicting views:…”

Section: Introductionmentioning

confidence: 99%

“…But in basic glasses fluorine is present as F Ϫ coordinated with Ca 2ϩ and does not contribute to the breakage of Si-O bonds. 6,7,10) (ii) Fluorine predominantly bonds with silicon for a CaF 2 concentration of less than about 10 mol%, and is present as F Ϫ coordinated with Ca 2ϩ for higher CaF 2 concentration. 10,12) (iii) Fluorine is present as F Ϫ coordinated with Ca 2ϩ and does not contribute to the breakage of Si-O bonds irrespective of glass compositions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluorine on Silicate Network for CaO-CaF2-SiO2 and CaO-CaF2-SiO2-FeOx Glasses.

et al. 2002

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The chemical state of fluorine and the effect of fluorine addition on the degree of polymerization of silicate network have been investigated for the CaO-SiO 2 -CaF 2 and CaO-SiO 2 -CaF 2 -FeO x glasses using the Xray photoelectron spectroscopy (XPS) and Mössbauer spectroscopy measurements. The F1s XPS spectra indicate that the fluorine is dominantly coordinated with calcium rather than silicon. The O1s XPS spectra for the CaO-SiO 2 -CaF 2 glasses and the values of Fe 2ϩ /Fe 3ϩ obtained by Mössbauer spectra for the CaO-SiO 2 -CaF 2 -FeO x glasses indicate that CaF 2 addition does not depolymerize the silicate network for both systems.KEY WORDS: chemical state of fluorine; polymerization; silicate network; X-ray photoelectron spectroscopy; Mössbauer spectroscopy.

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