-
测定了晶态Al6Mn,准晶Al4Mn和准晶Al6Mn的Mn原子K吸收EXAFS谱(包括Mn原子K的近限吸收谱)。研究了准晶Al4Mn和准晶Al6Mn中Mn原子周围的第一近邻结构,讨论了Mn原子周围第一近邻Al原子的分布特征。在准晶Al6Mn和准晶Al4Mn中,Al-Mn间原子平均距离约为2.52?,小于晶态中Al-Mn间平均距离,围绕Mn原子的配位数约为EXAFS spectra (including near edge X-ray absorption spectra) have been measured at the Mn K edge of i-Al6Mn, i-Al4Mn and crystalline Al6Mn. The first near-neighbor structures about Mn atom of the i-Al6Mn and i-Al4Mn have been studied and discussed. We found that the average distance between Al and Mn atoms is about 2.52 angstrom in quasicrystalline phases and its shorter than that in crystalline Al6Mn. The coordination number around Mn atom is about 5 in quasicrystalline phases and is less than that in crystalline Al6Mn. The structure unit may be the same as in i-Al6Mn and i-Al4Mn. It is reasonable that the Mn atoms distribute on the surface of the unit.
计量
- 文章访问数: 6043
- PDF下载量: 420
- 被引次数: 0
下载:
