Phase Transformation and Infrared Absorption Spectra of Amorphous and Crystalline Nano-Al2O3 Powder

Abstract

Abstract: Amorphous and crystalline nano-Al₂O₃ powders prepared by directly oxidic method and room-temperature hydrolytic method, using aluminium amalgam as precursors,
were characterized by XRD, TEM and DTA. It was found that the amorphous nano-Al₂O₃ powder only underwent γ→α transformation having no transition
phase, and the transformation process of crystalline nano-Al₂O₃ powder is γ→θ→α and incomplete. The IR measurements
were performed and the characteristic IR spectra of amorphous nano-Al₂O₃ nano γ-Al₂O₃ and nano θ-Al₂O₃ were obtained. The above results
were analyzed and discussed from viewpoints of low-temperature relaxation of amorphous nano-Al₂O₃ powder and lattice distortion of α-Al₂O₃.

Key words: nano-Al₂O₃ powder, amorphous, phase transformation,IR spectra, relaxation

GU Tangsheng,LIN Guangming. Phase Transformation and Infrared Absorption Spectra of Amorphous and Crystalline Nano-Al₂O₃ Powder[J]. Journal of Inorganic Materials.

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Phase Transformation and Infrared Absorption Spectra of Amorphous and Crystalline Nano-Al₂O₃ Powder

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