TITLE:
Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na2O-45P2O5
AUTHORS:
Zineb Chabbou, Said Aqdim
KEYWORDS:
Phosphate Glasses, Glass Formation, IR Spectroscopy, X-Ray Diffraction, SEM
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.4 No.10,
October
21,
2014
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.