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Your search keyword '"R. Dall'Igna"' showing total 3 results
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3 results on '"R. Dall'Igna"'

1. Optical and spectroscopic properties of soda-lime alumino silicate glasses doped with Er3+ and/or Yb3+

Author

S. Sebastiani, Marco Bettinelli, Massimo Brenci, B. Profilo, Stefano Pelli, Giancarlo C. Righini, Adolfo Speghini, Simone Berneschi, R. Dall'Igna, and G. Nunzi Conti

Subjects
Materials science, Absorption spectroscopy, Analytical chemistry, Physics::Optics, Inorganic Chemistry, chemistry.chemical_compound, Optics, Soda lime, Aluminosilicate, Radiative transfer, Emission spectrum, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Spectroscopy, alumino silicate glasses, business.industry, Organic Chemistry, Doping, waveguide amplifier, Er3+/Yb3+ doped glasses, Atomic and Molecular Physics, and Optics, Silicate, Electronic, Optical and Magnetic Materials, chemistry, Absorption (chemistry), business
Abstract

A new set of soda-lime alumino silicate (SLAS) glasses doped with a fixed percentage of Er3+ and different percentages of Yb3+ ions was produced by conventional melting process. Their spectroscopic properties, namely absorption and emission spectra, radiative and experimental lifetimes, were measured and are discussed here. Planar and channel optical waveguides were produced in these glasses by ion-exchange, and their characterization is reported as well.

Published
2006

2. Ce3+ or Tb3+-doped phosphate and silicate scintillating glasses

Author

Stefania Baccaro, Francesco Meinardi, R Zannoni, Karel Nitsch, Martin Nikl, G.P. Pazzi, G Zanella, C. Susini, P. Polato, P. Fabeni, A. Vedda, R. Dall'Igna, Marco Martini, J.A. Mares, Baccaro, S, Dall'Igna, R, Fabeni, P, Martini, M, Mares, J, Meinardi, F, Nikl, M, Nitsch, K, Pazzi, G, Polato, P, Susini, C, Vedda, A, Zanella, G, and Zannoni, R

Subjects
Materials science, Doping, Biophysics, Analytical chemistry, Mineralogy, General Chemistry, Condensed Matter Physics, Phosphate, Biochemistry, Emission intensity, Atomic and Molecular Physics, and Optics, Silicate, Ion, chemistry.chemical_compound, chemistry, Irradiation, Emission spectrum, Absorption (electromagnetic radiation), scintillating glasses, FIS/03 - FISICA DELLA MATERIA
Abstract

Optical characterization of scintillating phosphate and silicates glasses is presented including absorption, emission spectra and decay kinetics. A new concept of energy transfer sensitization is developed, based on nearly resonant energy migration through a rare earth ion subsystem (Gd 3+ ions at sufficiently high concentration) in the glass matrix, followed by a single-step transfer towards the emission centers created by Ce 3+ or Tb 3+ doping. While Ce 3+ doping in phosphates results in emission spectra in the near UV-violet, the Tb 3+ doping in silicates gives a four-band spectrum with a dominating one at 545 nm. Intense UV irradiation produces a reduction of emission intensity in phosphate glasses.

Published
2000

3. Inertization of hazardous dredging spoils.

Author

Bernstein AG, Bonsembiante E, Brusatin G, Calzolari G, Colombo P, Dall'Igna R, Hreglich S, and Scarinci G

Subjects
Construction Materials, Hazardous Substances, Hot Temperature, Metals, Heavy isolation & purification, Ceramics, Conservation of Natural Resources, Geologic Sediments chemistry, Metals, Heavy chemistry
Abstract

Vitrification and production of ceramics materials starting from sediment excavated from Venice lagoon is described. This sediment is classified as toxic waste because contains several heavy metal ions and organic pollutants and was successfully vitrified at 1200-1350 degrees C. Twenty weight percentage of glass cullet, coming from a community glass recycling program, was added to the raw materials, previously calcined at 900 degrees C, as a way of adjusting the variations of composition of the individual sediment batches. Chemical durability (leaching) tests showed that the optimized glass compositions are inert, and thus not only volume reduction but also inertization of the waste was obtained by this process. Moreover, the economics of the entire process was analysed. The valorization of the waste was accomplished by the subsequent processing of the glass derived from the inertization. Glass ceramic materials were produced by viscous phase sintering of pressed glass powders which crystallized during the densification process. Sintered glass ceramic products had good mechanical characteristics (HV = 7.5 GPa, bending strength 150 +/- 8 MPa), making them suitable for applications in the building industry.

Published
2002
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