کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1329313 | 978904 | 2009 | 7 صفحه PDF | دانلود رایگان |

A systematic crystallographic analysis of the 〈110〉 and 〈111〉 vacancy-ordered structure of cubic δ-Bi2O3 obtained from electronic-structure calculations is presented. The ordering of vacancies leads to a doubling of the unit-cell that results in a 2×2×2 fluorite super-structure, with an associated reduction in its space group symmetry from Fm3¯m to Fm3¯. The Bi atoms present inside the 〈111〉 vacancy-ordered oxygen sublattice have equal Bi–O bond lengths, whereas, those present inside the 〈110〉 vacancy-ordered oxygen sublattice have three different pairs of Bi–O bond lengths. The specific ionic displacements and electronic charge configurations also depend on the nature of vacancy ordering in the oxygen sub-lattice.
1/8 of a 2×2×2 δ-Bi2O3 superstructure having Fm3¯ space group. Every oxygen (black) has three possible positions, only one of which is filled either by O1 (red) or O2 (blue).Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 182, Issue 5, May 2009, Pages 1222–1228