期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2016
卷号：7
期号：2
页码：444-449
出版社：University of Mohammed Premier Oujda
摘要：Glasses with composition 20K 2 O-xMnO-(80-x)P 2 O 5 with 0≤ x ≤30 mol% were prepared by conventional melt quenching technique at 1100°C mixtures of K 2 CO 3 , MnCO 3 and NH 4 H 2 PO 4 . Their density, molar volume, glass transition temperature and infrared spectroscopy have been investigated. Differential Scanning Calorimetry (DSC) measurements give the variation of glass transition temperature (Tg) from 225°C for x=0 to 440°C for x=30 mol %. The density ( . ) measurements increase from 2.28 to 2.89 g.cm -3 . The evolution of infrared spectra with the composition is studied and the oxide forming character is discussed. When manganese oxide is added to potassium phosphate glass, phosphate chains are depolymerized by the incorporation of distorted (4) units through P-O-Mn bonds. it is assumed to be presented as [MnO 4/2 ] 2- structural units a corner sharing geometry and the electrical neutrality in the system is achieved by the conversion of [POO 3/2 ] into [PO 4/2 ] + units
关键词：Phosphate glasses; Glass transition temperature; DSC; IR spectroscopy; X;Ray Fluorescence
