Buscar
Mostrando ítems 1-10 de 145
Crystallization of fluorindate and fluorogallate glasses
(1997-10-01)
Crystallization of binary InF3-MF2 and GaF3-MF2 (where M = Ba, Sr and Ca) glasses was studied. Characteristic temperatures and kinetic parameters E (activation energy) and n (Avrami exponent) were obtained. Stability against ...
Thermal properties of fluoride glasses and their gel precursors
(Kluwer Academic Publ, 2004-01-01)
Xerogels were prepared from zirconium, barium, aluminum, lanthanum and lithium acetates, corresponding to a Li containing ZBLA composition. The study of their thermal properties (DSC, TG/DTG, FT-IR) showed that they might ...
Inversion in the temperature coefficient of the optical path length close to the glass transition temperature in tellurite glasses
(American Institute of Physics (AIP), 2009-06-22)
In this study, thermal lens spectrometry was applied to determine the thermo-optical properties of fragile tellurite glasses as a function of temperature, close to the glass transition region. The results showed an inversion ...
In(PO3)3 stabilised fluoroindate glasses
(1998-07-24)
Results on thermal and optical characterization of new lanthanide containing fluoroindate glasses in the system InF3-BaF2-In(PO3)3 are presented. Good optical quality and very stable glasses presenting up to 5 mm in thickness ...
Synthesis and Structural Studies of Er3+ Containing Lead Cadmium Fluoroborate Glasses and Glass-Ceramics
(Sociedade Brasileira de Química, 2002-01-01)
A partir de resultados de experimentos de fusão e choque térmico, o domínio vítreo foi identificado no sistema PbF2-CdF2-B2O 3. Vidros puros e dopados com Er3+ foram preparados e vitrocerâmicas foram obtidas a partir de ...
Electrical conductivity of silicate glasses with tetravalent cations substituting Si
(Elsevier B.V., 2012-10-15)
The effects of substituting Si by M4+ cations in soda-lime silica glasses were analyzed by impedance spectroscopy in the frequency range of 1 Hz-1 MHz. The glass composition was (mol%) 22Na(2)O center dot 8CaO center dot ...
Development of an experimental glass ionomer cement containing niobium and fluoride
(Elsevier B.V., 2005-12-15)
Glass ionomer cements (GICs) are currently used for various dental applications such as luting cements or as restorative materials. The calcium fluoro-alumino-silicate system is the basis for degradable glasses used to ...
Structural and spectroscopic study of oxyfluoride glasses and glass-ceramics using europium ion as a structural probe
(Iop Publishing Ltd, 2008-04-09)
Transparent oxyfluoride glasses and beta-PbF(2) nanocrystals containing glass-ceramics were prepared with varying Eu(3+) content (0.3, 0.4, 0.5 and 0.6%). The effect of Eu(3+) content on the preparation of glass-ceramics ...
1.5 mu m emission and infrared-to-visible frequency upconversion in Er+3/Yb+3-doped phosphoniobate glasses
(Elsevier B.V., 2006-09-15)
Sodium phosphoniobate glasses with the composition (mol%) 75NaPO(3)-25Nb(2)O(5) and containing 2 mol% Yb3+ and x mol% Er3+ (0.01 <= x <= 2) were prepared using the conventional melting/casting process. Er3+ emission at 1.5 ...
Enhanced frequency upconversion in Er3+ doped fluoroindate glass due to energy transfer from Tm3+
(2002-12-01)
Energy transfer processes between Er3+ and Tm3+ were investigated examining the frequency upconversion emissions in a fluoroindate glass pumped at 790 nm. A 60-fold enhancement in the emission at ≈670 nm originating from ...