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P group glass) and SiO 2 –P 2 O 5 –K 2 O–CaO–MgO (the Si group glass) system modified by MoO 3 addition were prepared. In each group of glasses constant quantities of P 2 O 5 , K 2 O and SiO 2 were kept and increasing amount of MoO 3 was

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absorption bands at 1,143 and 911 and an absorption band at 1,437 cm −1 (attributed to the symmetric and asymmetric vibrations of P–O in the P–O–P group and the N–H group of APP, respectively). The spectra indicate that the long APP chains in the APP

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