Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na₂O-45P₂O₅

Zineb Chabbou¹, Said Aqdim^1,2*

¹Laboratoire de Physique de haute Energie et de l’Etat Condensé, Faculty of Science, University Hassan II Ain Chock, Casablanca, Morocco.
²Laboratoire de Chimie Minérale, Département de Chimie, Faculty of Science, Université Hassan II Ain Chock, Casablanca, Morocco.

DOI: 10.4236/ampc.2014.410021                

Abstract

The influence of CaO on the glass forming characteristics and properties of Na₂O-CaO-ZnO-P₂O₅ glasses has been investigated. According to the studies that we performed on phosphate based glass within system xCaO-(40-x)ZnO-15Na₂O-45P₂O₅ (10 ≤ x ≤ 30; mol%), it was found that the increase of CaO and substitution of ZnO can give a good chemical durability. Both Cristallographies X-ray and IR spectroscopy have confirmed the structure change when the CaO content increases in the glass. This change results in the formation of metaphosphate and/or rings of metaphosphate groups at the expense of pyrophosphate. So it indicates the formation of Ca-O-P bonds in the network glass that replaces hydrated P-O-Na and P-O-P bands. The phosphate chains units can be bonded together in rings forming meta-phosphate groups. These rings likely lead to the formation of agglomerates of crystalline phases, which is the main cause of the increase in the chemical durability of the glasses when the CaO content increases. The latter may lead to wider use of these materials, especially in the biomedical field.

Keywords

Phosphate Glasses, Glass Formation, IR Spectroscopy, X-Ray Diffraction, SEM

Conflicts of Interest

The authors declare no conflicts of interest.

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