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1916-2016

Synthesis, structure and spectroscopic properties of CaO–Ga2O3–GeO2 glasses

Synthesis, structure and spectroscopic properties of CaO–Ga2O3–GeO2 glasses

The Cr, Mn and Eu doped CaO–Ga2O3–GeO2 glasses of different composition were obtained by high temperature synthesis. The x-ray structure factor for glasses withCa3Ga2Ge3O12 (calcium gallium germanium garnet), Ca3Ga2Ge4O14 (Ca gallogermanate) and Ca3Ga2O6crystals stoichiometric compositions shows glassy like pattern. EPR spectroscopy of the Cr, Mn and Eu dopedCaO–Ga2O3–GeO2 glasses yields the following: (i) chromium is incorporated into the glass network as the Cr3+(3d3, 4F3/2) ions and occupied strongly distorted octahedral sites; (ii) observed EPR spectra in the Mn doped glasses are attributed to Mn2+ (3d5, 6S5/2) isolated ions in octahedral sites and small clusters of Mn2+ ions; (iii)europium is incorporated into the glass network as Eu3+(4f6, 7F0) ions, exclusively. Optical absorption, emission and luminescence excitation spectra of the Cr3+, Mn2+and Eu3+ ions in CaO–Ga2O3–GeO2 glasses were investigated and analysed in terms of crystal field theory. From the spectroscopic data the crystal field strength (10Dq), the Racah parameters (B and C) and the energy of electron lattice interaction (Sћw) for Cr3+ centres were estimated. Peculiarities of incorporation and spectroscopic properties of Cr3+, Mn2+ and Eu3+ ions inCaO–Ga2O3–GeO2 glasses and their crystalline analogies have been discussed.

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