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    Wyświetlanie 1-6 z 6
    Tytuł:
    Investigation of Infrared and Raman Spectra of $TeO_2-Nb_2O_5-TiO_2$ Glasses
    Autorzy:
    Kabalci, İ.
    Gökçe, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360392.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    61.05.Cp
    82.80.Gk
    78.30.Ly
    Opis:
    X-ray diffraction, infrared (IR), Raman spectroscopy and scanning electron microscope techniques have been used to investigate the microstructural properties of the glass materials. In this work, a new type of tellurite based optical glasses with $TeO_2$/$Nb_2O_5$/$TiO_2$ for different $xNb_2O_5$ (x = 5, 10, 15, and 20 mol.%) glass compositions at constant 5 mol.% $TiO_2$ ratio were prepared. The effect of $Nb_2O_5$ contents on the structural unit of $(95-x)TeO_2-(x)Nb_2O_5-5TiO_2$ glass network, and the intensity ratios of the Raman peaks were investigated. The results indicate that for different $Nb_2O_5$ content 5 to 20 mol.% in the glass system, three vibrational peaks around 650, 800, and 920 $cm^{-1}$ which correspond to the structural bonding of the glass were observed in the range of 500-2000 $cm^{-1}$ for the IR spectra. Furthermore, from the Raman results a structural evolution was determined with the number of structural units such as $[NbO_6]^{7-}$, $TeO_{3+1}$ (polyhedra), $TeO_4$ (trigonal bipyramids), $TeO_3$ (trigonal pyramids) or $TeO_{3+1}$ (polyhedra), and $[NbO_4]^{3-}$ for this ternary glass system.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 877-881
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intrinsic Luminescence of the Undoped Glasses of (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) System
    Autorzy:
    Padlyak, B. V.
    Bordun, O. M.
    Buchynskii, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010938.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    78.60.-b
    76.30.Mi
    Opis:
    For the first time the intrinsic luminescence in the undoped (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses with different composition has been found and investigated in the 80÷300 K temperature range. The new glasses of high chemical purity and optical quality with stoichiometric composition similar to that in calcium-gallium- germanium garnet (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{3}$O$\text{}_{12}$), trigonal Ca-gallogermanate (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$), and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ crystals were obtained by the high-temperature synthesis method. The luminescence and photoexcitation spectra analysis, supported by EPR spectroscopy data, yields the following results: (i) the UV-excited non-elementary broad emission band with maxima at roughly 500 nm and 420 nm in the (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses is due to recombination of ensemble of the transient hole O$\text{}^{-}$ centres; (ii) the emission bands with maxima at nearly 380 and 710 nm, which were distinctly revealed in glasses with the Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$ and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ compositions, are assigned to the luminescence of UV-induced electron centres of two different types. Possible models of the luminescence centres in (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glass network are discussed.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 921-929
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urbachs Rule in Undoped and Co Doped $(80-x)Sb_2O_3-20Na_2O-xWO_3$ Glasses
    Autorzy:
    Petkova, P.
    Soltani, M.
    Petkov, S.
    Nedkov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490939.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    78.20.Ci
    78.30.-j
    Opis:
    We have analyzed the Co influence on the absorption spectra of $(80-x)Sb_2O_3-20Na_2O-xWO_3$ glasses in the Urbach rule region at room temperature. We present the comparison between Co and $WO_3$ manifestation in the spectral region 2.64-3.14 eV. The spectral characteristics of "crystalline" and "glassy" Urbach's rule are also calculated.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 152-154
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Characterization of $Sb_2O_3-M_2O-MoO_3$ (M~= Li,~K) New Glasses
    Autorzy:
    Soltani, M.
    Hamzaoui, M.
    Houhou, S.
    Touiri, H.
    Bediar, L.
    Ghemri, A.
    Petkova, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399699.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    78.20.Ci
    78.30.-j
    Opis:
    New heavy metal oxide glasses involving $Sb_2O_3$ have been investigated. By using classical routes (melting-casting), glasses synthesized in silica crucibles were obtained in the combination of ternary systems $Sb_2O_3-M_2CO_3-MoO_3$ (M = Li and K). Characteristic temperatures such as glass transition $T_{g}$, and onset of the crystallization $T_{x}$, have been measured using differential scanning calorimeter. Ultrasonic velocities were measured by using pulse echo method to determine the elastics parameters, such as elastic modules (E, G, K, L). Other physical properties were measured, such as density and optical transmission window in far infrared spectra using KBr pellets. Influence of composition on these physico-chemical properties is discussed and correlated to the glass structure.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 227-229
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of Basic and $Er^{3+}$-Doped Glasses in the System $Y_{2}O_{3}-Al_{2}O_{3}-ZrO_{2}$
    Autorzy:
    Klement, R.
    Hruška, B.
    Hronský, V.
    Olčák, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382720.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Hj
    42.70.Ce
    78.55.Qr
    Opis:
    The undoped, and Er-doped yttrium aluminozirconate (AYZ) glasses were prepared by flame synthesis in the form of transparent glass microbeads. The $ZrO_{2}$ content was in the range between 5 and 20 mol. %. The prepared glass microbeads were characterised by optical microscopy, SEM, XRD, DSC, $\text{}^{27}Al$ MAS NMR, UV-VIS-NIR and fluorescence spectroscopy. The thermal stability of AYZ glasses, expressed in terms of the difference between the glass transition temperature, $T_{g}$, and the onset of crystallization, $T_{x}$, was not affected by the increasing $ZrO_{2}$ content. The $\text{}^{27}Al$ MAS NMR spectra of studied glass samples reveal that Al atoms are predominantly 4-coordinated in glasses. The AYZ5 and AYZ10 basic glasses were doped with $Er^{3+}$ at the level of 1-5 mol. % of $Er_{2}O_{3}$. The UV-VIS-NIR/fluorescence spectra show characteristic absorptions/emissions, due to the optically active $Er^{3+}$ ions in the host glasses. The absorption/emission properties of guest ions are not significantly affected by the glass host.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 302-303
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption Studies on Some Silicate and Cabal Glasses Containing NiO or $Fe_{2}O_{3}$ or Mixed NiOi + $Fe_{2}O_{3}$
    Autorzy:
    Moustaffa, F.
    El-Batal, F.
    Fayadd, A.
    El-Kashef, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538677.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    42.72.Bj
    71.20.Be
    76.80.+y
    Opis:
    Ultraviolet and visible absorption of some sodium and potassium silicate and cabal glasses containing nickel oxide, ferric oxide or both nickel and ferric oxides together have been investigated. In alkali silicate glasses, nickel ions reveal no ultraviolet absorption bands but they show characteristic visible absorption bands due to octahedral and tetrahedral coordinations while iron ions show weak visible absorption bands which are related to ferric ions mostly in tetrahedral state, especially at high alkali oxide content; also iron ions reveal charge transfer ultraviolet absorption bands which are assigned mostly to ferric ions with few ferrous contributions. The proportion of tetrahedral state increases with the increase in the alkali oxide content for the two transition metal oxides. In cabal glasses, nickel ions tend to exist mostly in octahedral state, while ferric ions exist mostly in octahedral and some in tetrahedral form, all the absorption obtained are attributed to their respective energy levels. The ratio of the different coordinations states are discussed in relation to the glass composition.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 471-477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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