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EPR of Irradiation Induced Centers in Some VitreousMatrices Containing Copper

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Journal of Materials Science & Technology 1995年第4期11卷 299-303页

作者： M.Peteanu L.Cociu and I.Ardelean (Faculty of Physics, babes-Bolyai University, 3400 Cluj-Napoca, Romania) babes-Bolyai Univ Cluj-Napoca Romania

Boro-germanate glasses containing copper, i.e., xCuO(1-x)[GeO2·B2O3] subjected to gamma irradiation, were studied by means of EPR. Comparisons were made with the xCuO·(1-x)[Na2B4O7] system. Irradiation induced centers were detected. These are: electron trapped at a hydrogen compensated germanium ion centers; boron oxygen hole centers and electron trapped at an oxygen vacancy centers. Strong dependence of the paramagnetic irradiation-induced centers concentration on the CuO content of the sample was evidenced.

关键词： EPR of Irradiation Induced Centers in Some VitreousMatrices Containing Copper

EPR and Magnetic Susceptibility Investigations of Fe Containing TeO_2-B_2O_3-SrF_2 Glasses

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Journal of Materials Science & Technology 2000年第6期16卷 596-600页

作者： I.Ardelean, M.Peteanut, V.Simon and F.Ciorcas (Faculty of Physics, babes-Bolyai University, 3400 Cluj-Napoca, Romania) [Manuscript received November 23, 1999, in revised form June 20, 2000] Faculty of Phys. Babes-Bolyai Univ. Cluj-Napoa Romania

Iron ions were used as probes to explore the structural and magnetic properties of 70TeO2'25B2O3' 5SrF2 vitreous matrix. The distribution of Fe3+ ions on different structural aggregates was revealed by means of EPR, as depending on Fe2O3 concentration. Strongly distorted octahedral sites were detected for the isolated paramagnetic ions, and also clusters of Fe ions especially at high Fe2O3 content of samples. Magnetic susceptibility measurements evidenced both dipoledipole and superexchange type interactions involving iron ions. Mixed valence states of iron ions were also detected

关键词： Te In Fe EPR and Magnetic Susceptibility Investigations of Fe Containing TeO2-B2O3-SrF2 Glasses line

Structural and Magnetic Properties of MnO-P_2O_5-PbO Glasses

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Journal of Materials Science & Technology 1999年第5期15卷 453-456页

作者： I.Ardelean M.Peteanu O.Cozar V.Simon V.Mih and G.Botezan (Faculty of Physics, babes-Bolyai University, 3400 Cluj-Napoca, Romania To whom correspondence should be addressedE-mail: arde@phys.ubbcluj.ro ) Faculty of Physics Babes-Bolyai University 3400 Cluj-Napoca Romania

The xMnO(100-x)[***] glasses were prepared with MnO concentration being in the range of 0≤x≤50 mole fraction and were investigated by EPR spectroscopy and magneticsusceptibility measurements. Octahedral symmetric sites tetragonally distorted were detected for x≤5 mole fraction MnO. Only Mn2+ ions were identified in these glasses, involved in dipoledipole interactions

关键词： PbO MnO Structural and Magnetic Properties of MnO-P2O5-PbO Glasses