Transformation evolution and infrared absorption spectra of amorphous and crystalline nano-Al2O3 powders

被引：171

作者：

Shek, CH ^{[1
]}

Lai, JKL ^{[1
]}

Gu, TS ^{[1
]}

Lin, GM ^{[1
]}

机构：

[1] ZHONGSHAN UNIV,DEPT PHYS,GUANGZHOU 510275,PEOPLES R CHINA

来源：

NANOSTRUCTURED MATERIALS | 1997年 / 8卷 / 05期

关键词：

D O I：

10.1016/S0965-9773(97)00201-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Amorphous and crystalline nano-Al2O3 powders were prepared by direct oxidation and hydrolysis of pure aluminum, respectively. The results by XRD and DTA measurements revealed that after annealing at 1370 K, the evolution in the amorphous nano-Al2O3 powder involved a low temperature relaxation followed by a simple beta- to alpha-Al2O3 transition. On the other hand, the gamma- to theta- to alpha-Al2O3 transitions occurred in crystalline nano-Al2O3 powder. The infrared absorption spectra (IR) for both nano-powders after annealing at different temperatures were measured. The IR spectrum of the amorphous nano-Al2O3 powder exhibited a very broad and smooth band, without any fine structure in the wave-number range from 400 to 1000 cm(-1). This is in contrast to that of crystalline nano-Al2O3 powder. The results mentioned above are discussed with reference to the structure relaxation of amorphous nano-Al2O3 powder and the concept of lattice distortion. (C) 1997 Acta Metallurgica Inc.

引用

页码：605 / 610

页数：6

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