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Type: Article × Subject: fabrication ×

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    Thermal annealing studies of GeTe-Sb2Te3 alloys with multiple interfaces
    (New York : American Institute of Physics, 2017) Bragaglia, Valeria; Mio, Antonio M.; Calarco, Raffaella
    A high degree of vacancy ordering is obtained by annealing amorphous GeTe-Sb2Te3 (GST) alloys deposited on a crystalline substrate, which acts as a template for the crystallization. Under annealing the material evolves from amorphous to disordered rocksalt, to ordered rocksalt with vacancies arranged into (111) oriented layers, and finally converts into the stable trigonal phase. The role of the interface in respect to the formation of an ordered crystalline phase is studied by comparing the transformation stages of crystalline GST with and without a capping layer. The capping layer offers another crystallization interface, which harms the overall crystalline quality.
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    Structural relaxation phenomena in silicate glasses modified by irradiation with femtosecond laser pulses
    (London : Nature Publishing Group, 2017) Seuthe, Thomas; Mermillod-Blondin, Alexandre; Grehn, Moritz; Bonse, Jörn; Wondraczek, Lothar; Eberstein, Markus
    Structural relaxation phenomena in binary and multicomponent lithium silicate glasses were studied upon irradiation with femtosecond (fs) laser pulses (800 nm central wavelength, 130 fs pulse duration) and subsequent thermal annealing experiments. Depending on the annealing temperature, micro-Raman spectroscopy analyses evidenced different relaxation behaviours, associated to bridging and non-bridging oxygen structures present in the glass network. The results indicate that the mobility of lithium ions is an important factor during the glass modification with fs-laser pulses. Quantitative phase contrast imaging (spatial light interference microscopy) revealed that these fs-laser induced structural modifications are closely related to local changes in the refractive index of the material. The results establish a promising strategy for tailoring fs-laser sensitivity of glasses through structural mobility.