The Fe-57 NMR spectra in yttrium iron garnets (YIG) containing low con
centrations of the nontrivalent cations Ca2+ and Si4+ were measured. T
he analysis of the satellite structure caused by Si4+ and Ca2+ substit
utions in the neighborhood of the resonating iron ion indicated that t
he spatial correlation of Si4+ and Ca2+ is small. (C) 1998 Elsevier Sc
ience B.V. All rights reserved.