Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses
Paweł Goj, M Ciecińska, Magdalena Szumera, L. Stoch
Abstract
Abstract Iron phosphate glasses are materials that can have many applications like durable matrixes in waste immobilization techniques, biomaterials, optoelectronic devices, etc. Their possible usage is related to their glass network and thermal properties. The influence of Na 2 O content on thermal properties and crystallization ability of iron phosphate glass of base composition 30 Fe 2 O 3 –70 P 2 O 5 mol% were studied. Increasing the content of Na 2 O causes a decrease in transformation temperature and increase in Δ C p . Characteristic temperatures, thermal stability and crystallizing phases were determined. Increasing content of sodium causes depolarization of iron phosphate glass network which causes a continuous change in Δ C p and glass transformation temperature. Discontinuous change in some glass properties suggests structure rebuilding about 30 mol% of Na 2 O.