EPR Study of Fe3+Paramagnetic Centers in Doped Triglycine Sulphate Crystals

Abstract

This paper presents EPR study of Fe 3 + in triglycine sulphate doped with Fe 3 + crystal. Fe 3 + ion is in a high spin stateS = 5/2. EPR signal can be detected only below 200 K. At 4.2 K the EPR spectrum results from three non-equivalent sites of Fe 3 + ions. The spin Hamiltonian: H = β BgS+D[S 2 z -(1/3)S(S +1)] + E(S 2 x - S 2 y ) has been applied to describe the spectrum. The zero field splitting parameter in this case fulfills the condition: D hv. An experimental spectrum reflects clearly only two resonance transitions: ‖′½> (the lowest Kramers doublet) and ‖ ′ 3/2> (the middle Kramers doublet). The iron complexes occupy interstitial positions in the crystal with distorted octahedral or tetrahedral co-ordination.