J. Phys. I France
Volume 7, Numéro 12, December 1997
Page(s) 1701 - 1708
DOI: 10.1051/jp1:1997164
J. Phys. I France 7 (1997) 1701-1708

Electric Field Gradients at $\mathsf{^{57}}$Fe Nuclei in the Sr $\mathsf{_3}$Fe $\mathsf{_2}$Ge $\mathsf{_4}$O $\mathsf{_{14}}$ Trigonal Germanate

D. Barb, S. Constantinescu and D. Tarina

Institute of Atomic Physics, INFM, PO Box Mg-07, Bucharest, Romania

(Received 16 May 1997, revised 7 July 1997, accepted 24 July 1997)

A computation of the lattice electric field gradient tensor at the octahedral and tetrahedral Fe 3+ sites in the Sr 3Fe 2Ge 4O 14 trigonal germanate is performed, taking into account the fractional ionic charges provided by the valence summation procedure. The correlation of the calculated Mössbauer quadrupole splittings with those found experimentally shows the role of the local environment distortion in the quadrupole interaction of iron nuclei in this structure.

© Les Editions de Physique 1997