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EPR and magnetic investigation of calcium – phosphate glasses containing iron ions

I. ARDELEAN1,* , C. ANDRONACHE1,2, C. CÎMPEAN1, P. PĂŞCUŢĂ3

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
  2. Department of Physics, North University, 430083 Baia Mare, Romania
  3. Department of Thermotechnics, Technical University, 400641 Cluj-Napoca, Romania

Abstract

The structural and magnetic properties of xFe2O3·(100-x)[P2O5⋅CaO] with 0.5 ≤ x ≤ 50 mol % were investigated. Information about the structural units involving iron ions, their valence state, the strengths and type of interactions involving them was obtained using EPR spectroscopy and magnetic susceptibility measurements. The Fe3+ ions in sites of distorted octahedral symmetry and clustered formations containing both Fe3+ and Fe2+ ionic species were evidenced. Dipolar and superexchange interactions involving iron ions were revealed depending on the iron content of the sample. For the glasses with x > 35 mol % the evaluated values of the µeff indicate the possible presence of Fe+ ions or the coordination influence on the magnetic moment of iron ions, but the presence of small quantities of the antiferromagnetic or ferrimagnetic interactions between iron ions in studied temperature range cannot be excluded..

Keywords

Calcium-phosphate glass, Fe2O3-P2O5-CaO, EPR.

Submitted at: June 13, 2006
Accepted at: July 20, 2006

Citation

I. ARDELEAN, C. ANDRONACHE, C. CÎMPEAN, P. PĂŞCUŢĂ, EPR and magnetic investigation of calcium – phosphate glasses containing iron ions, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 4, pp. 1372-1376 (2006)