EPR spectroscopy of Cu2+ and Mn2+ in borate glasses

• Autorzy: Drzewiecki A. , Padlyak B. , Adamiv V. , Burak Y. , Teslyuk I.
• Konferencja: Electron Magnetic Resonance Forum EMR-PL (2; 16-18.05.2013; Częstochowa-Hucisko, Poland )
• Języki publikacji: EN

Abstrakty

EN

Electron paramagnetic resonance (EPR) spectra of the CaB4O7 and LiCaBO3 glasses containing 0.5 and 1.0 mol.% CuO and MnO2 impurity compounds were investigated at room temperature. The glasses with CaB4O7:Cu, LiCaBO3:Cu, CaB4O7:Mn and LiCaBO3:Mn compositions were produced from the corresponding polycrystalline compounds using standard glass synthesis and technological conditions developed by the authors. The EPR spectral parameters of the Cu2+ and Mn2+ centres in both glasses containing 0.5 and 1.0 mol.% CuO and MnO2 doping oxides were determined. Analysis of EPR spectral parameters shows that Cu impurity is incorporated into the CaB4O7 and LiCaBO3 glass network as isolated Cu2+ (3d9, 2D5/2) paramagnetic ions. The Cu2+ ions occupy Ca(Li) sites of the borate glass network coordinated by six O2− anions with geometry of elongated octahedron (D4h symmetry) due to the Jahn- -Teller effect. The EPR spectra of the Mn-doped CaB4O7 and LiCaBO3 glasses are virtually identical and typical of all oxide glasses activated with Mn2+ (3d5, 6S5/2) ions. Observed EPR spectra in the Mn-doped glasses were attributed to isolated Mn2+ (1) centres (geff ≅ 4.3) in octahedral Ca(Li) sites with a strong (fully) rhombic distortion, isolated Mn2+ (2) centres (geff ≅ 2.0) in octahedral Ca(Li) sites with nearly cubic local symmetry as well as pairs and small clusters of the Mn2+ ions, coupled by magnetic dipolar and exchange interactions. On the basis of the obtained results and analysis of referenced data, the local structure of the Cu2+ and Mn2+ centres in the borate glasses have been proposed.

Słowa kluczowe

EN

borate glasses; Cu2+ paramagnetic centre; electron paramagnetic resonance (EPR) spectroscopy; hyperfine structure; Mn2+ paramagnetic centre

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2013
• Tom: Vol. 58, No. 3
• Strony: 379--385
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Drzewiecki A.

• Institute of Physics, University of Zielona Góra, 4a Szafrana Str., 65-516 Zielona Góra, Poland

autor

Padlyak B.

• Institute of Physics, University of Zielona Góra, 4a Szafrana Str., 65-516 Zielona Góra, Poland and Institute of Physical Optics, 23 Dragomanov Str., 79-005 Lviv, Ukraine, Tel.: [phone], Fax: [phone]

autor

Adamiv V.

• Institute of Physical Optics, 23 Dragomanov Str., 79-005 Lviv, Ukraine

autor

Burak Y.

• Institute of Physical Optics, 23 Dragomanov Str., 79-005 Lviv, Ukraine

autor

Teslyuk I.

• Institute of Physical Optics, 23 Dragomanov Str., 79-005 Lviv, Ukraine

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