- 作者: 許火順
- 作者服務機構: Synchrotron Radiation Research Center, Hsinchu Science-Based Industrial Park, Hsinchu 30077, Taiwan, R.O.C.
- 中文摘要: The charge transfer between Cobalt and Iron ions in a series of (Co, Fe) Prussian blues has been investigated by synchrotron X-ray absorption spectroscopy and powder diffraction. (Co, Fe) Prussian blues, AxCoy[Fe(CN)6]×nH2O where A = Li, Na, K, Rb and Cs, were prepared by dropwise mixing method. X-ray absorption near edge spectra showed that cobalt was in a higher oxidation state when the interstitial alkali cation changed from Li, Na, to K, Rb, Cs. At the same time, the valence of Fe shifted from 3+ to 2+. The cation driven charge transfer ability follows the order of Li ? Na < K < Rb ? Cs. A similar trend was also found when the KCl concentration was increased during the synthesis of K-containing Prussian blue. The higher the concentration of KCl, the more Fe2+-CN-Co3+ fragment in the (Co, Fe) Prussian blue, and hence the higher efficiency for photo-induced magnetization. The Co-N distance in Prussian blue became shorter, about 0.15 A in Co2+ salt compared to Co3+ salt, and the unit cell dimension was reduced about 0.3 A as well.
- 英文摘要: --
- 中文關鍵字: Prussian blue; Charge transfer; Cation driven; EXAFS; XRD.
- 英文關鍵字: Prussian blue; Charge transfer; Cation driven; EXAFS; XRD.