Synthesis of Fluorophosphate Glasses with Low Melting Temperatures

Leissner, J.; Sebastian, K.; Roggendorf, H.; Schmidt, Harald

doi:10.4028/www.scientific.net/msf.67-68.137

Cited by 4 publications

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“…A c c e p t e d m a n u s c r i p t 5 As reported in table 3, the coefficient of thermal expansion (CTE) of glasses in the MnF 2 -NaPO 3 -ZnF 2 system is close to 188 x 10 -7 K -1 and variations resulting from composition changes are very small: neither the NaPO 3 /MnF 2 nor the ZnF 2 /MnF 2 substitutions influence significantly the CTE. But we can say that it increases slightly with the size of the third cation (Zn, Sr, Ba, K).…”

Section: Thermal Expansionmentioning

confidence: 89%

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Fluorophosphate glasses containing manganese

Djouama

Boutarfaïa

Poulain

2008

Journal of Physics and Chemistry of Solids

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New fluorophosphate glasses based on MnF 2 , NaPO 3 and MF n (M = Zn 2+ , Sr 2+ , Mg 2+ , Ba 2+ , Li + , Na + and K + ) have been synthesised and characterized. Large vitreous areas were observed. Samples of 4 mm in thickness have been obtained. These glasses are easy to prepare and stable in ambient air. Depending on the composition and the nature of the M cation, glass transition temperature, Tg, lies between 230 and 314°C, crystallisation temperature, Tx is between 320 and 475°C. These glasses are pink coloured, and infrared transmission extends up to 4.5 m with extrinsic OH -absorption band at 3200 cm -1 and other bands around 2200 and 1600 cm -1 that relate to PO 4 tetrahedron vibration. Other physical properties including density, microhardness, Young modulus, thermal expansion and refractive index were investigated and correlated to composition.

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Section: Thermal Expansionmentioning

confidence: 89%

“…Numerous fluorophosphate glasses have been studied for their potential applications [1][2][3][4][5]. Most of them are based on alkali, earth alkali or trivalent polyphosphates with the general formula M(PO 3 ) n , with n = 1, 2 or 3.…”

Section: Introductionmentioning

confidence: 99%

Fluorophosphate glasses containing manganese

Djouama

Boutarfaïa

Poulain

2008

Journal of Physics and Chemistry of Solids

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Fluorine Compounds, Inorganic, Tin

Lindahl

Mahmood

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Tin forms stannous fluoride, stannic fluoride, and fluorostannates. Stannous fluoride is a white solid with mp 215C. It is soluble in water ∼ 30–39% and up to 72–82% in anhydrous hydrogen fluoride. It is commercially prepared by the action of hydrogen fluoride on stannous oxide or metallic tin. Stannous fluoride is used widely in dentifrices and dental preparations because of its anticaries effect. Complexes of the type MSnF 3 , where M Rb, Cs, etc, were obtained from the molten mixture of SnF 2 with NaF, Rb, and CsF. Stannic fluoride is a white solid that sublimes at 705C. It can be prepared from the reaction of fluorine, chlorine trifluoride, or bromine trifluoride with tin(II) or tin(IV) compounds. It acts as a Lewis acid to form many complexes. It is used in the manufacture of glasses. Stannous fluoroborate, Sn(BF 4 ) 2 , is produced in an electrochemical cell and is used in electroplating.

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