Temperature dependence of atomic coordinates is determined for RbMn[Fe(CN)6] by means of synchrotron-radiation (SR) X-ray powder structural analysis. We observed a structural transition from the cubic (F4̄3m; Z = 4) to the tetragonal (I4̄m2; Z = 2) phase at ≈210 K in the cooling run and at ≈300 K in the warming run. In the low-temperature tetragonal phase, we found Jahn-Tellar type distortion of the MnN6 octahedra and compression of the averaged Fe-C bond distance. These structural data suggest that the structural transition is triggered by the inter-metallic charge-transfer from the Mn(II) site to the Fe(III) site.
- Rietveld structural analysis
- Synchrotron-radiation X-ray powder diffraction
- Transition metal cyanide
ASJC Scopus subject areas
- Physics and Astronomy(all)