Fabrication and physical characteristics of new glasses from wastes of limestone and phosphorite rocks

Bulletin of materials science

K H S SHAABAN²  RABIE S FARAG³  M A M UOSIF²  K A ALY¹  YASSER B SADDEEK² 

[1] Faculty of Science, Physics Department, Al-Azhar University, Assiut 71524, Egypt$$Physics Department, Faculty of Science and Arts, University of Jeddah, P.O. Box 80200, Jeddah, Saudi Arabia$$Faculty of Science, Physics Department, Al-Azhar University, Assiut 71524, EgyptFaculty of Science, Physics Department, Al-Azhar University, Assiut 71524, Egypt$$Physics Department, Faculty of Science and Arts, University of Jeddah, P.O. Box 80200, Jeddah, Saudi Arabia$$Physics Department, Faculty of Science and Arts, University of Jeddah, P.O. Box 80200, Jeddah, Saudi ArabiaFaculty of Science, Physics Department, Al-Azhar University, Assiut 71524, Egypt$$Physics Department, Faculty of Science and Arts, University of Jeddah, P.O. Box 80200, Jeddah, Saudi Arabia$$;Faculty of Science, Physics Department, Al-Azhar University, Assiut 71524, Egypt$$Faculty of Science, Physics Department, Al-Azhar University, Assiut 71524, EgyptFaculty of Science, Physics Department, Al-Azhar University, Assiut 71524, Egypt$$;Faculty of Science, Chemistry Department, Al-Azhar University, Nasr City, Cairo, Egypt$$Faculty of Science, Chemistry Department, Al-Azhar University, Nasr City, Cairo, EgyptFaculty of Science, Chemistry Department, Al-Azhar University, Nasr City, Cairo, Egypt$$

关键词: Recycling;    calcium borate glasses;    elastic moduli;    FTIR.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

In this work, new glasses were synthesized from wastes of limestone and phosphate rocks besides commercial borax. The glasses were characterized by FTIR, DTA, ultrasonic techniques and UV spectroscopy. It was found that the concentration of both CaO and P$_2$O$_5$ increases and the concentrations of B$_2$O$_3$ and Na$_2$O decrease as the content of phosphate rocks increases. Variation of the contents of the different oxides affects the concentration of the structural units constituting the glass, which was indicated by the behaviour of the fraction N$_4$ of BO$_4$ units in the borate matrix. The density and the refractive index of the glasses decrease as the CaO and P$_2$O$_5$ contents increase, which was attributed to the increase of [BO$_3$] structural units. On the other hand, the physical parameterssuch as the ultrasonic velocity, the elastic moduli, the optical bandgap and the optical polarizability increased, which was attributed to the higher coordination number of CaO$_6$ compared with the coordination of borate structuralunits and to the former effect of P$_2$O$_5$. As a result, a polymerization of the total co-ordination number of the glass, crosslink density and connectivity within the glass network will occur.

【 授权许可】

Unknown