Fluorophosphate glasses containing manganese

Abstract

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.

Structural investigation of fluorophosphate glasses by 19F, 31P MAS-NMR and IR spectroscopy

“…However the incorporation of fluorides increases chemical durability as this was observed in the NaPO 3 -BaF 2 -MF n ternary systems (M = Mg, Mn, Zn, Fe, Cr, Ga) [10]. In a general way, sodium fluorophosphate glasses are easy to prepare, stable versus devitrification and withstand humid atmosphere [11]. Glass formation has been reported in other multicomponent fluorophosphate glasses [6].…”

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

“…However, these fluoride based glasses have various regular features, such as the chemical reactivity of fluoride melts, devitrification tendency and responsiveness to water. In that sense, the combination of oxides and fluorides, particularly oxyfluorophosphate glasses, appears to be very interesting and attractive materials [7,8].…”

Electrical and dielectric properties of MnF2–ZnF2–NaPO3 glasses

“…Manganese and zinc fluorophosphate glasses have been investigated recently, confirming the stabilizing effect of sodium polyphosphate in fluoride glasses based on MnF 2 [3], and the compatibility of phosphate and fluoride vitreous networks. Manganese concentration may be large, beyond 40 mol% in some cases, while zinc and manganese cations may be substituted almost completely.…”