کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1449653 | 988711 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The crystal structure of high temperature phase Ta2O5 The crystal structure of high temperature phase Ta2O5](/preview/png/1449653.png)
The high temperature phase of Ta2O5 and its variants were maintained in a pure Ta2O5 specimen using the conventional solid-state reaction method and the advanced laser irradiation technique. The structure of the high temperature phase is determined to be tetragonal with lattice parameters of a = 3.86 Å and c = 36.18 Å and space group of I41/amd. Compared to the previously reported crystal structure, the number of the total basis atoms was reduced to be 6 from 11. The modified crystal structure interprets well the recorded high-resolution electron microscopy images and the selected area electron diffraction patterns. Based on the basic tetragonal structure, the crystal lattice structures of the orthorhombic and monoclinic variants were determined and the corresponding space groups were analyzed according to the variation of the symmetrical elements. In addition, crystal atomic structures of these two variants were proposed based on the tetragonal structure.
Journal: Acta Materialia - Volume 55, Issue 7, April 2007, Pages 2385–2396