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Título

Selective thermo-emission in directionally solidified Al2O3-Er3Al5O12 and Al2O3-Er3Al5O12-ZrO2 eutectics

AutorMesa, M. Cristina; Oliete, Patricia B.; Merino, R. I.; Orera, V. M.
Fecha de publicación2012
CitaciónDSEC IV (2012)
ResumenSelective thermoemission of RE-oxide eutectics (RE = rare earth ions) has been investigated. In particular, the optical absorption and emission properties of Al2O3-Er3Al5O12 and Al2O3-Er3Al5O12-ZrO2 eutectic ceramic rods directionally solidified using the laser floating zone technique at several growth rates, were studied. Different microstructures were developed depending on the composition and the rate of solidification. Binary eutectic microstructure consisted in a three-dimensional interpenetrated network of both eutectic phases whereas ternary eutectic showed a geometrical microstructure at low growth rates and a nanofibrillar pattern at high growth rates. The size of the crystalline eutectic phases was strongly dependent on the growth rate, decreasing when the solidification rate increased. The visible and infrared optical absorption of the eutectics were measured at room temperature. Judd-Ofelt analysis was used to model the optical absorption of the Er3+ ions in the studied samples. Thermal emission of the eutectic rods was studied by heating the eutectic rods with a 10.6 mm CO2 laser at temperatures between 1000 and 1600ºC. Selective emission coincident with the 4f Er3+ ion transitions was measured. In particular, an intense narrow emission band at a wavelength of 1.55 mm matching with the sensitive region of the GaSb photoconverter was obtained. The influence of the composition and the size of the microstructure on the selective emission were investigated.
DescripciónResumen del trabajo presentado al 4th International Directionally Solidified Eutectic Ceramics Workshop celebrado en Washington (US) del 14 al 17 de octubre de 2012.
URIhttp://hdl.handle.net/10261/121987
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