Size Dependent Coordination Behavior and Cation Distribution in MgAl2O4 Nanoparticles from 27Al Solid State NMR Studies
Size Dependent Coordination Behavior and Cation Distribution in MgAl2O4 Nanoparticles from 27Al Solid State NMR Studies
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DOI：
10.1021/jp800412k
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
V. Sreeja;T. Smitha;D. Nand;T. G. Ajithkumar;P. Joy
中科院分区：
文献类型：
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作者：
V. Sreeja;T. Smitha;D. Nand;T. G. Ajithkumar;P. Joy
尖晶石型氧化物纳米颗粒如铁氧体在许多重要领域具有巨大的优势和应用。将颗粒尺寸减小到纳米尺寸将增加表面体积比，这将强烈影响这些材料的物理和化学性能。对于磁性纳米粒子，由于表面配位行为的改变，粒子表面的交换作用与内部的交换作用不同。因此，研究和了解尖晶石型氧化物纳米颗粒中不同金属离子的配位和分布行为具有十分重要的意义。固体核磁共振是获取局部结构变化信息的一种有用而重要的技术。采用27Al魔角自旋（MAS）核磁共振波谱法测定了不同粒径的非磁性尖晶石MgAl2O4纳米颗粒中Al3+离子在四面体和八面体位置的分布程度。它已经……
Nanoparticles of spinel-type oxides such as ferrites offer great advantages and applications in many important areas. Decreasing the size of the particles to nanometer size will increase the surface-to-volume ratio and this will strongly influence the physical and chemical properties of these materials. For magnetic nanoparticles, the exchange interactions at the surface of a particle will be different from those inside due to changes in the coordination behavior at the surface. Therefore, studying and understanding the coordination and distribution behavior of the different metal ions in the nanoparticles of spinel-type oxides is very important. Solid state NMR is a useful and important technique to obtain information on local structural variations. The degree of the distribution of the Al3+ ions in the tetrahedral and octahedral sites in the nanoparticles of the nonmagnetic spinel MgAl2O4 having different particle sizes has been determined by 27Al magic-angle spinning (MAS) NMR spectroscopy. It has been...