Abstract

This paper discusses exchange splitting in the spectra of Er3+ introduced as a spectroscopic probe in rare-earth ferroborates RFe₃(BO₃)₄(R=Y,Er,Tb,Gd). The temperatures of magnetic ordering are determined [38±1 K for YFe₃(BO₃)₄, 39±1 K for ErFe₃(BO₃)₄, 41±1 K for TbFe₃(BO₃)₄, 37±1 K for GdFe₃(BO₃)₄] and the spin-reorientation transition in GdFe₃(BO₃)₄: TR=7.5±0.5 K. Based on a comparison of the Er³⁺ spectra in GdFe₃(BO₃)₄, the magnetic structure of which is known, and in other ferroborates, a conclusion is made concerning the orientation of the magnetic moments of iron M_Fe in the magnetically ordered state: M_Fe⊥c for yttrium and erbium ferroborates, and M_Fe||c for terbium ferroborate.

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