Physics Journal
Articles Information
Physics Journal, Vol.6, No.1, Mar. 2020, Pub. Date: Feb. 14, 2020
Structural Investigations on ZnO Doped with Al2O3
Pages: 1-6 Views: 221 Downloads: 93
Authors
[01] Gomaa-El Damrawi, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[02] Naer Baker, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[03] Ahamed Al-kalbani, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Abstract
The phase change and micro-structure determination of both ZnO and ZnO-Al2O3 matrices have been investigated using nuclear magnetic resonance spectroscopy (NMR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and transition electron microscopy (TEM) with selected area electron diffraction (SAED). The effect of both material structure and thermal heat treatment (THT) at different temperatures on the crystallization nature of ZnO and Al2O3-ZnO nanoparticles was recorded. A well-controlled crystallization extraction was followed by crystalline phase formation. The matrix structure of ZnO-Al2O3 is completely changed by partially replacing ZnO with Al2O3. It is confirmed that the quantity and type of crystalline ZnO phases are affected by changing glass structure and heat treatment temperature. The crystalline structure in the ZnO matrix is fully transformed into an amorphous one by introducing Al2O3 to ZnO. This finding was due to the development of the material structure through non-bridging bonds (NBB). The NBB formation can reduce the unified and symmetrical structure leading to the formation of the less orderly network. On the other hand, the amorphous phases are converted into the crystalline (ZnAl2O4) one, especially in heat-treated ZnO-Al2O3 glasses. This is because the THT mechanism will allow the process of phase separation that leads to crystallization to take place. The structure and size of various crystals can be identified by TEM microscopy. The 27AlNMR analysis showed a considerable change in chemical shift upon increasing Al2O3. Sample containing 1 w% Al2O3 contains defective AlO4 units. While sample containing 5 w% Al2O3 has a more shielded structure due to formation of strengthened Al4-O-Zn4 bonds
Keywords
Zinc Nanoparticles, Heat Treatment, Amorphous Phase, Phase Separation, NMR Spectroscopy
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