Structural Transitions in Alumina Nanoparticles by Heat Treatment

被引：3
|
作者：
Kaur, Nirmal [1 ]
Khanna, Atul [1 ]
Chen, Banghao [2 ]
Gonzalez, Fernando [3 ]
机构：
[1] Guru Nanak Dev Univ, Dept Phys, Glass Phys & Sensors Lab, Amritsar 143005, Punjab, India
[2] Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA
[3] Univ Cantabria, Dept Chem & Proc & Recourse Engn, E-39005 Santander, Spain
来源：
DAE SOLID STATE PHYSICS SYMPOSIUM 2015 | 2016年 / 1731卷
关键词：
Alumina nanoparticles; XRD; DSC; MAS-NMR; PHASE;
D O I：
10.1063/1.4947632
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
gamma-alumina nanoparticles were annealed sequentially at 800 degrees C, 950 degrees C and 1100 degrees C and structural transitions as a function of heat treatment were studied by X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC) and Al-27 Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) methods.. XRD studies found that gamma-Al2O3 is stable upto a temperature of at least 950 degrees C and transforms to the thermodynamically stable alpha-phase after annealing at 1100 degrees C. MAS-NMR revealed that gamma-alumina contains AlO4 and AlO6 structural units in the ratio 1: 2, while alpha-phase contains only AlO6 units. DSC confirmed that gamma ->alpha transition initiates at 1060 degrees C.
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页数：3
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