Abstract
A spread of compositions within the NbV1-xNb IVxO2-xF1+x solid solution have been successfully synthesized in the range 0≤x≤0.48. In each case electron diffraction has revealed the presence of strong planar diffuse scattering perpendicular to each of the three 〈001〉 directions at the G±〈hkq〉* regions of reciprocal space, where G represents a Bragg reflection of the ReO3 type average structure, h and k are continuously variable and q is a fixed (at any one particular composition), composition-dependent parameter in the range from 1/3 to 1/2. Careful electron probe microanalysis indicates that the value of q is directly related to composition via the equation q=(x+1)/3 and hence acts as a "chemical ruler" for the composition. A plausible model for the implied one-dimensional O/F ordering as well as for the observed shift in the position of the diffuse versus composition is provided via a crenel type occupational atomic modulation function.
Original language | English |
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Pages (from-to) | 2177-2182 |
Number of pages | 6 |
Journal | Journal of Solid State Chemistry |
Volume | 177 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2004 |