In the work presented at the SISPAD conference we performed first-principles calculations of the structure and of the EPR parameters for the P1, P2 and POHC paramagnetic centers in o'(P2O5) and P2O5 glass. The results are satisfactory and confirm the validity of the adopted theoretical approach to model paramagnetic defects in phosphate glasses. Furthermore the work supports for the P1 a structural analogy to the Si-E' center and suggests the possible occurence of another P1-like configuration in phosphate glasses having significative fractions of Q1 and Q2 tetrahedral units.
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