کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1519206 | 1511623 | 2006 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Heat-induced charge transfer in cobalt iron cyanide Heat-induced charge transfer in cobalt iron cyanide](/preview/png/1519206.png)
The heating of Co(2+) ferricyanide above 80 °C induces an inner charge transfer from Co(2+) towards Fe(III) to form the mixed valence system Co(2+)Co(III) ferri- ferro-cyanide. This charge transfer takes place preserving the material framework and forming a solid solution of the initial and final species. The cell edge of the cubic cell (Fm-3m) of this solid solution follows a regular variation with the material composition. This mixed valence system was characterized using X-ray diffraction, infrared, thermo-gravimetric, Mössbauer and magnetic measurements. Its formation is easily detected by the appearance of an intermediate ν(CN) absorption band in the infrared spectra at around 2120 cm−1, 40 cm−1 below and above the observed frequency for this vibration in Co(2+) ferri- and ferro-cyanide, respectively.
Journal: Journal of Physics and Chemistry of Solids - Volume 67, Issue 11, November 2006, Pages 2289–2299