LASIR UMR-CNRS 8516, Université de Lille 1, Villeneuve d'Ascq, France.
IMMCL, Université de Lille 1, Villeneuve d'Ascq, France.
Solid State Nucl Magn Reson. 2017 Jul-Aug;84:137-142. doi: 10.1016/j.ssnmr.2017.02.003. Epub 2017 Feb 9.
Solid state NMR is applied in this contribution on the xAlO-(50-x/2)NaO-(50-x/2)PO composition line (with 0<x<5mol%) in order to investigate the distribution of Al ions in AlO-doped sodium phosphate glasses. The structure was analysed by (i) Al 1D-, 3Q-, DQ- MAS-NMR analysis and (ii) 1D P, Al(P) 2D D-HMQC MAS-NMR and 2D P R-INADEQUATE technique. The Al NMR results confirm the presence of six-coordinated aluminate as major aluminate species and indicate that Al ions are fully dissociated in the glass network. The P NMR data show the simultaneous presence of five different phosphate units connected to 0, 1 but also 2 Al ions and offer a new vision of the doping mechanism by highlighting a non-homogeneous distribution of Al ions in the phosphate matrix. This study indicates that the glass networks contain Al-rich and -poor domains and present thus a significant structural disorder beyond the local order.
固态 NMR 在此项研究中应用于 xAlO-(50-x/2)NaO-(50-x/2)PO 组成线（0<x<5mol%），以研究 Al 离子在 AlO 掺杂的磷酸钠玻璃中的分布。结构通过 (i) Al 1D-、3Q-、DQ-MAS-NMR 分析和 (ii) 1D P、Al(P) 2D D-HMQC MAS-NMR 和 2D P R-INADEQUATE 技术进行分析。Al NMR 结果证实六配位的铝酸盐是主要的铝酸盐物种，并表明 Al 离子在玻璃网络中完全离解。P NMR 数据表明同时存在与 0、1 但也与 2 Al 离子连接的五种不同的磷酸盐单元，并通过突出 Al 离子在磷酸盐基质中的不均匀分布提供了掺杂机制的新视角。这项研究表明，玻璃网络包含富 Al 和贫 Al 区域，因此存在超出局部有序的显著结构无序。
