Manganese chlorophosphate NaPO 3 -MnCl 2 glasses were prepared via two synthetic routes and their thermal and spectroscopic properties were analyzed in order to draw a comparison between the conventional method of glass preparation, i.e. melting and quenching of the precursor salts and the so-called "coacervate route" for glass preparation. In this procedure, polyphosphate coacervates of the desired glass compositions are prepared by the mixture of an aqueous solution of the salts, separation

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... d drying of the denser separated-phase, the coacervate. The coacervates are then melted and quenched to yield glasses. Differential Scanning Calorimetry (DSC), Differential Thermal Analysis (DTA) and Raman Spectroscopy results lead to a description of the "coacervate-derived glasses" as a system in which the polyphosphate chains are longer and mostly interconnected, when compared to the traditional glasses.