The Mössbauer effect of the 37.2 keV γ transition of 121Sb has been employed to study the electronic configuration of Sb ions in BaPb1-xSbxO3 superconducting materials. The isomer shift is constant as a function of Sb content and falls in the region correspoding to the Sb(V) valence state. The isomer shift of 7 mm/s is the lowest value yet observed for an Sb(V)O 6 chromophore and indicates a high degree of covalency, corresponding to significant 5sm5pn hybridization. The mixed valence state of an equal amount of Sb(III) and Sb(V) has not been observed.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)