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合成金刚石中金属Ni结构形态的扩展X射线吸收谱研究
引用本文:李晨曦,陆坤权,赵雅琴,沈主同.合成金刚石中金属Ni结构形态的扩展X射线吸收谱研究[J].物理学报,1990,39(6):19-24.
作者姓名:李晨曦  陆坤权  赵雅琴  沈主同
作者单位:(1)冶金部钢铁研究总院,北京,100081; (2)中国科学院物理研究所,北京,100080
摘    要:用荧光扩展X射线吸收谱(EXAFS)方法测量了人工合成金刚石中金属熔媒Ni的结构形态。Ni呈现出面心立方结构,与纯金属Ni相似。从Ni原子周围C原子的配位和Ni-Ni原子间距的增大,说明有C原子溶解于Ni中,估算出的溶解度为9at%,大大超过常压下Ni中C原子的溶解度极限2.7at%。金刚石中Ni原子近邻配位数比纯金属状态Ni中小。这表明Ni以微粒形式分布于金刚石中,推算出这些微粒尺度约为20?。 关键词

关 键 词:金刚石    结构形态  X射线吸收谱
收稿时间:1989-08-29

AN EXAFS STUDY OF THE STRUCTURAL MORPHOLOGY OF Ni IN SYNTHETIC DIAMOND
LI CHEN-XI,LU KUN-QUAN,ZHAO YA-QIN and SHEN ZHU-TONG.AN EXAFS STUDY OF THE STRUCTURAL MORPHOLOGY OF Ni IN SYNTHETIC DIAMOND[J].Acta Physica Sinica,1990,39(6):19-24.
Authors:LI CHEN-XI  LU KUN-QUAN  ZHAO YA-QIN and SHEN ZHU-TONG
Abstract:The structral morphology of metal catalyst Ni in the synthetic diamond was measured by using the fluorecence EXAFS technique. The nickle impurities found exist as fee structure, which is similar to the pure metal Ni. The results obtained from the amount of C atoms coordinated surround Ni and the dilation of Ni-Ni distance show about 9 at-% carbon in the metal Ni matrix which is much more than the limit of earbon solubility 2.7 at-% in metal Ni at normal pressure. The coordination number of Ni in diamond found is less than that in pure metal. This shows that the nickle in the diamond distributes as small particles with dimension about 20?.
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