Synthesis and structural characterization of alumina nanoparticles

被引：26

作者：

Kaur, Puneet ^{[1
]}

Khanna, Atul ^{[1
]}

Kaur, Nirmal ^{[1
]}

Nayar, Priyanka ^{[1
]}

Chen, Banghao ^{[2
]}

机构：

[1] Guru Nanak Dev Univ, Dept Phys, Amritsar, Punjab, India

[2] Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA

来源：

PHASE TRANSITIONS | 2020年 / 93卷 / 06期

关键词：

Alumina nanoparticles; annealing; Al-27-MAS NMR; Al-O speciation; transition alumina phases; NANOCRYSTALLINE ALPHA-AL2O3; PHASE-TRANSFORMATION; LASER-ABLATION; GAMMA-ALUMINA; TRANSITION; POLYMORPHS; NMR; THETA-AL2O3; BEHAVIOR; LIQUID;

D O I：

10.1080/01411594.2020.1765245

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Alumina nanoparticles were synthesized by thermal dehydration of Al(OH)(3) (gibbsite), which shows the sequential formation of AlOOH (bohemite), gamma, delta, theta, and alpha-alumina phases upon heat treatment in the temperature range: 150-1150 degrees C. Alumina nanoparticles were characterized by X-ray diffraction and Al-27 MAS-NMR studies to investigate the structural transitions, in particular, the changes in Al-O speciation as a function of heat treatment. gamma-alumina is produced by annealing bohemite at 400 degrees C, and transforms into alpha-alumina via the formation of delta and theta-alumina as the intermediate phases. The formation of theta and alpha-alumina starts at 1020 degrees C and the concentration of these phases increases upon annealing at 1100 degrees C, while the concentrations of gamma and delta-alumina decreases steadily. The heat treatment at 1150 degrees C produces alpha-phase (84%) and the remnant theta-phase (16%). Al-27 MAS-NMR revealed the existence of two types of Al-O speciation i.e. AlO4 and AlO6 structural units whose relative concentration depends upon the transition alumina phases.

引用

页码：596 / 605

页数：10

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