硅酸盐学报

氮化铝镓纳米固体材料的合成及其拉曼光谱

作者：曹永革许涛许燕萍兰玉成陈小龙

单位：中国科学院物理研究所中国科学院物理研究所中国科学院物理研究所中国科学院物理研究所中国科学院物理研究所北京100080 北京100080 北京100080 北京100080 北京100080

关键词：氮化铝镓纳米固体氨热合成拉曼光谱

分类号：TB383

出版年,卷(期):页码：2002,30(2):212-215

DOI：

摘要：

利用氨热法合成了AlxGa1 -xN合金的纳米固体 ,其中Al含量的摩尔数可在x =0～ 1的范围内变化 .在x值从 0到 1整个范围内 ,对该合金的纳米固体进行了激光Raman光谱分析 ,证实了A1 (LO)声子的单模式行为和E2 声子的双模式行为 .从实验现象中还可以推断出A1(TO)声子可能具有单模式行为 .Al(LO)声子频率在x =0～ 0 .5范围内迅速单调增加 ,当x >0 .5时则缓慢增加 ,这可能是由于纳米颗粒之间的相互作用造成的 .对于A1 (TO) ,A1 (LO) ,和E2 (GaN)声子模式 ,其线宽在x =0 .5时达到最大值

Al x Ga 1- x N alloy nanocrystalline solids were synthesized by ammonothermal method. The Al compositional fraction x in the materials ranged from 0-1. The Raman scattering spectra of the alloy within the whole range of x values were investigated, from which a one_mode type behavior of A 1(LO) phonon and a two_mode type behavior of E 2 phonon were clearly demonstrated. It can be further deduced from the observed results that the A 1(TO) phonon may have a one-mode type behavior. The measured frequencies of A l(LO) phonon showed a rapid monotonous increase with increasing of x from 0 to 0.5. A slow increase of the frequencies after x >0.5 was observed, which might be resulted from the interaction among the nanoparticles in the condensed solids. For A 1(TO), A 1(LO) and E 2(GaN) phonon modes, the linewidth behaviors followed a pattern that exhibited a maximum at x =0.5, a value at which a maximum disorder should be expected in a random system.

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参考文献：

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