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.

引用

页数：3

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