Structural studies of Na2O–ZnO–Bi2O3–P2O5 system glasses

investigated by DSC and FTIR spectroscopy


S. Zaroual1, M. Ztya1,  N. Dridi2, A. Chahine1, EL. H. Arbib1*

1Laboratoire de Physico-Chimie des Matériaux Vitreux et Cristallisés. Equipe de Physico-Chimie des Matériaux Inorganiques,

Université Ibn Tofail, Faculté des Sciences, Kénitra-Maroc

2Laboratoire de chimie du solide appliquée. Université Mohamed V-Agdal, Faculté des Sciences Rabat-Maroc

* Corresponding author. E-mail:

Received: 22 April 2012; revised version accepted: 28 May 2012



     The properties and structure of (50-x)Na2O–xZnO–10Bi2O3–40P2O5 (0 = x = 50 mol%) glasses were investigated. These properties include density, molar volume and glass transition temperature. The increase of density of glasses with increasing ZnO is related to the constitution of the glass. The variation in the molar volume of these glasses is in accordance with the molecular volume between Na2O and ZnO. The glass transition temperature increases as the ZnO is substituted for Na2O. This behavior indicates that the replacement of Na2O by ZnO improves the strength of the cross-links between the phosphate chains of the glasses. The analysis of the infrared spectra ofthe studied glasses reveals that the increase of ZnO content decreases the formation of the non-bridging oxygens.


Keywords: Phosphate glasses; Density; Molar volume; DSC; Infrared spectroscopy.

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