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Influence of Ga on the optical and thermal properties of Er2S3 doped stoichiometric and nonstoichiometric Ge-Ga-Se glasses
Authors: Munzar Martin | Koughia Cyril | Tonchev D. | Maeda K. | Ikari T. | Haugen C. | Decorby R. | McMullin J.N. | Kasap S.O.
Year: 2005
Type of publication: článek v odborném periodiku
Name of source: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
Publisher name: Society of Glass Technology
Place: Sheffield
Page from-to: 215-219
Titles:
Language Name Abstract Keywords
cze Vliv Ga na optické a termální vlastnosti stechiometrických a nestechiometrických Ge-Ga-Se skel dotovaných Er2S3. Byl studován vliv Ga a vazebné stechiometrie na optické a termální vlastnosti Ge-Ga-Se skel dotovaných Er2S3. Glasses, Chalcogenides, Thermal properties, Optical properties, Erbium, Compositional stoichiometry
eng Influence of Ga on the optical and thermal properties of Er2S3 doped stoichiometric and nonstoichiometric Ge-Ga-Se glasses The Er3+ doped (0?3 at%) stoichiometric (GeSe2)1 - x (Ga2Se3)x and nonstoichiometric Gay(Ge30Se70)1 - y glasses with Ga content (CGa) 3?12 at% have been prepared. The main attention was paid to the influence of the Ga concentration and the compositional stoichiometry on thermal and optical properties of prepared glasses. We have found that stoichiometric (SG) glasses had substantially better thermal and optical properties than their nonstoichiometric (NSG) counterparts which even became inhomogeneous for CGa>9 at%. The difference between SG and NSG glasses, indicated by Raman spectra, is in the higher concentration of Ge?Ge homobonds in NSG glasses. The stable stoichiometric glasses with high Ga concentration (9 and 12 at%) can effectively embed more Er3+ ions, up to 2 at%, than SG with the medium Ga concentration (6 at%) as it is indicated by higher photoluminescence intensity at 1542 nm (transition 4I13/24I15/2). The Er3+ ions play two different roles in prepared glasses, at the low Er concentrations, CEr <0?2 at%, there is a reproducible fall (a 'dip') in the thermal stability gauged by the difference of the crystallisation (Tc) and glass transition (Tg) onset temperatures. This 'dip' gets more pronounced for higher Ga concentrations in such a way that SG with highest CGa = 12 at% (CEr=0?1 at%) is partially crystallised. However, for higher Er concentrations, CEr 1 at%, properly embedded Er3+ ions seem to stabilise the glass matrix compared to the undoped glasses indicated by the slight increase of Tg and Tc?Tg values. Glasses, Chalcogenides, Thermal properties, Optical properties, Erbium, Compositional stoichiometry

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