Accession Number : AD0425685

Title :   THE ELECTRIC FIELD GRADIENT TENSOR IN FERROUS COMPOUNDS,

Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA

Personal Author(s) : Ingalls, R.

Report Date : 22 JUL 1963

Pagination or Media Count : 35

Abstract : The electric field gradient tensor at the iron nucleus in ferrous (Fe2+) compounds is investigated. Under the combined action of axial and rhombic crystalline fields and the spin-orbit interaction, the ferrous ion (5D, 3d6) epsilon states produce a large, temperature dependent, contribution to the electric field gradient tensor. It is found that this direct contribution is diminished by that from the lattice itself (the second order axial and rhombic components of the crystalline field), as well as Sternheimer polarization effects and covalency. The results of this investigation are then applied to Mossbauer results in FeSiF6.6H2O to obtain an estimate of the electric quadrupole moment of Fe57m (0.2910.2b), which is in agreement with that from ferric (Fe3+) studies. Finally, estimates also based upon Mossbauer measurements, are made of the epsilon energy splittings in the ferrous compounds, FeSiF6.6H2O, FeSO4.7H2O, FeC2O4.2H2O, Fe(NH4SO4)1.6H2O, FeSo4, FeC1w.4H2O and FeF2. (Author)

Descriptors :   (*IRON COMPOUNDS, ELECTRIC FIELDS), (*MOSSBAUER EFFECT, MEASUREMENT), POLARIZATION, ELECTRIC MOMENTS, PERTURBATION THEORY, QUADRUPOLE MOMENT, PARAMAGNETIC RESONANCE, CRYSTAL LATTICES, NUCLEAR SPINS, FUNCTIONS(MATHEMATICS), TEMPERATURE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE