以铝汞齐为前驱物,采用直接氧化法与室温水解法分别制备了非晶态与晶态纳米Al2O3粉.由XRD及DTA测试结果可知,经1470K煅烧后非晶态纳米Al2O3仅发生γ→α的单一相变,无中间过渡相:而晶态纳米Al2O3的相变过程为γ→θ→α,且相变过程不完全,测定不同温度煅烧的试样的红外吸收光谱(IR),给出非晶态纳米Al2O3、纳米γ-Al2O3和纳米θ-Al2O3的特征IR谱.从非晶态纳米Al2O3粉低温弛豫与α-Al2O3晶格畸变观点讨论分析上述实验结果.
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.
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