Phase stability and structural distortion of NiO under high pressure

来源期刊:中国有色金属学报(英文版)2006年第z1期

论文作者:张卫兵 胡玉林 唐壁玉

文章页码:52 - 58

Key words:NiO; phase stability; structural distortion; strong correlation; first-principles calculation; high pressure

Abstract: The phase stability and structural distortion of NiO under high pressure were investigated using first-principles calculations based on density-functional theory. Different forms of exchange-correlation functional including LDA, GGA and GGA+U were used in the present calculations. All of the three methods predict NiO to be AFM II ordering with the cell slightly compressed along [111] direction and also indicate that there is no structural phase transition of NiO under pressure up to 140 GPa, which are in agreement with the experiment. However, both LDA and GGA incorrectly predict the structural distortion under pressure especially above 60 GPa. Only when strong correlations are included in form of GGA+U, structural distortion under high pressure can qualitatively agree with the experiment. The related mechanism was also analyzed and discussed. These results suggest that the strong electronic correlations still play a very important role in the properties of NiO under high pressure.

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