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

Sz. Łoś and Z. Trybuła Institute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, 60-179 Poznań, Poland

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Received: October 16, 2001

This paper presents EPR study of Fe3+ in triglycine sulphate doped with Fe3+ crystal. Fe3+ ion is in a high spin state S=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 Fe3+ ions. The spin Hamiltonian: H= βBgS+D[S2z-(1/3)S(S+1)] + E(Sx2-Sy2 has been applied to describe the spectrum. The zero field splitting parameter in this case fulfills the condition: D>>hν. An experimental spectrum reflects clearly only two resonance transitions: |±1/2> (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.

DOI: 10.12693/APhysPolA.101.279 PACS numbers: 76.30.Fc, 77.80.-e