Eur. Phys. J. B 13, 75-81 (2000)
https://doi.org/10.1007/s100510050011

Crystal-chemistry aspects and electric-field-gradient (EFG) dispersion in Ca-gallogermanate-type structures studied by Mössbauer spectroscopy

National Institute for Materials Physics, P.O. Box Mg.-07, 76900 Bucharest, Romania

Corresponding author: ^a sconst@alpha1.infim.ro or pcnet.pcnet.ro

Received: 3 February 1999
Published online: 15 January 2000

Abstract

The crystal field disorder in some trigonal germanates of the type XLn_yFeGeO₁₄ (X = Ba, Sr; Ln = La, Nd; y = 0, 1) is studied by ⁵⁷Fe Mössbauer effect. The dispersion of the electric field gradient (EFG) at the octahedral sites of these compounds is investigated. A correlation of the experimental and calculated EFG data with some crystal-chemistry aspects is presented.