Service de Physique du Solide et de Résonance Magnétique, Centre de'Etudes Nucléaires de Saclay, BP no. 2 - 91190, Gif-sur-Yvette, France
Abstract:
The Mössbauer quadrupole interaction ΔEQ of the Fe2+ ion has been measured with 2% at. 57Fe in ZnSiF6·6H2O, between 1.3 and 20°K. The sign of ΔEQ (< 0) has been determined by using a single crystal absorber. These results are interpreted in terms of a trigonal crystal field potential that splits the Fe2+ orbitals into a ground state singlet and a first excited doublet whose distance is much smaller than that reported for FeSiF6·6H2O, in reasonable agreement with previous EPR measurements.