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Optical spectroscopy of the Ho-doped glasses with 3CaO–Ga2O3–3GeO2 composition

100%

Padlyak B. V. , Kukliński B. , Buchynskii P. P.

Optica Applicata

2003

tom Vol. 33, nr 1

175-181

The UV and visible optical spectra (absorption, emission and luminescence excitation) of the Ho-doped CaO–Ga2O3–GeO2 glasses at room and liquid nitrogen temperatures have been investigated for the first time. The Ho-doped (CHo = 0.7 wt%) glass samples with garnet Ca3Ga2Ge3O12 (or 3CaO–Ga2O3–3GeO2) composition were prepared by the conventional high -temperature synthesis technique. By optical and EPR spectroscopy it has been shown that the holmium impurity is incorporated into the glass network as Ho3+ (4f10, 5I8) ions, exclusively. All transitions of the Ho3+ ions observed in optical spectra of Ho-doped 3CaO–Ga2O3–3GeO2 glasses are identified. The Ho3+ optical absorption spectrum has been analyzed and described in the framework of Judd–Ofelt theory. Optical absorption and emission spectra of the Ho3+ ions in the 3CaO–Ga2O3–3GeO2 glasses are quite similar to Ho3+ optical spectra in other oxide glasses and are characterized by statistical distribution of the local crystal field parameters. Incorporation peculiarities and spectroscopic properties of Ho3+ impurity ions in the glasses of CaO–Ga2O3– GeO2 system are discussed.

The MAS NMR study of solid solutions based on the YAG crystal

100%

Padlyak B. V. , Sergeev N. A. , Olszewski M. , Stępień P.

Nukleonika

2015

tom Vol. 60, No. 3, part 1

417--421

An 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) study of nominally pure and Cr-doped yttrium-aluminum garnet (Y3Al5O12 and Y3Al5O12:Cr) crystals is reported. It has been shown that the doping by Cr of the Y3Al5O12 crystals leads to the variation of the occupation by Al atoms both octahedrally and tetrahedrally coordinated sites of the garnet lattice.

Synthesis and X-ray structural investigation of undoped borate glasses

75%

Padlyak B. V. , Mudry S. I. , Kulyk Y. O. , Drzewiecki A. , Adamiv V. T. , Burak Y. V. , Teslyuk I. M.

Materials Science Poland

2012

tom Vol. 30, No. 3

264--273

A series of undoped borate glasses: Li2B4O7, LiKB4O7, LiB3O5, SrB4O7, and LiCaBO3 of high optical quality and chemical purity were obtained from the corresponding polycrystalline compounds using standard glass synthesis under technological conditions developed by the authors. The glasses were obtained by rapid cooling of molten crystalline material, which was heated to 100 K above the melting point to prevent crystallization and to exceed the glass transition point. The X-ray diffraction intensity profiles of the investigated glasses were typical of glassy compounds. The most typical intensity profile, consisting of almost symmetrical peaks, was observed in the case of Li2B4O7 and LiB3O5. Substitution and partial substitution of Li atoms by Sr and Ca atoms was accompanied by significant changes in the intensity profiles of the investigated glasses. Pair correlation functions and structural parameters (average interatomic distances and coordination number to oxygen) of the investigated glasses were evaluated and analyzed. Structural peculiarities of the investigated borate glasses are discussed in comparison with structural data available for their crystalline analogs.