Investigation of Al�?�O�?�Al sites in an Na-aluminosilicate glass

Bulletin of materials science

Erdem Yildirim¹  Ray Dupree² 

[1] Fen-Edebiyat Fakultesi, Fizik Bölumu, Kirikkale Universitesi, Kirikkale, Turkey$$Fen-Edebiyat Fakultesi, Fizik Bölumu, Kirikkale Universitesi, Kirikkale, TurkeyFen-Edebiyat Fakultesi, Fizik Bölumu, Kirikkale Universitesi, Kirikkale, Turkey$$;Department of Physics, University of Warwick, CV4 7Al, Coventry, England$$Department of Physics, University of Warwick, CV4 7Al, Coventry, EnglandDepartment of Physics, University of Warwick, CV4 7Al, Coventry, England$$

关键词: 17O MAS NMR;    aluminosilicates;    Alâ€�?�Oâ€�?�Al;    quadrupole coupling constant;    asymmetry parameter.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

This paper reports the presence of Alâ€�?�Oâ€�?�Al linkages in an aluminosilicate glass where Si/Al = 1 by using 2D ¹⁷O triple quantum MAS NMR technique (3Q MASNMR). The experiments were performed at external magnetic fields of 8.4 and 14.4T. Despite ¹⁷OMAS NMR spectra of the sample in both fields do not give much information about the different kinds of linkages in the sample, 3Q MAS NMR spectrum shows clear evidence that there are some amounts of Alâ€�?�Oâ€�?�Al linkages in the sample giving two completely resolved peaks. These two peaks were attributed to the Siâ€�?�Oâ€�?�Al and Alâ€�?�Oâ€�?�Al linkages on the basis of their chemical shifts and, quadrupolar coupling constants which are quite sensitive to the local structure.

【 授权许可】

Unknown