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- W2054013067 abstract "Glassy CdGeAs2 ingots are prepared by quenching vacuum sealed melts. Microstructural developments and phase transformations occuring during reheating of the glassy alloy are investigated by transmission electron microscopy (TEM and STEM), thermal analysis (DTA and DSC), and X-ray diffraction. TEM examination provided evidence for amorphous phase separation in glassy CdGeAs2; the microstructure exhibited a dispersion of fine droplets (≈ 40 nm) in a continuous matrix. Microdiffraction in the electron microscope confirmed the amorphous nature of both the droplet and matrix phases. Semi-quantitative microchemical characterization by scanning transmission electron microscopy (STEM) indicates a higher Cd/Ge ratio in the matrix than in the droplet phase. Characterization of heat treated glassy CdGeAs2 samples suggests formation of a precursor metastable crystalline phase prior to devitrification to stable crystalline CdGeAs2. The experimental results are used to suggest a decomposition sequence for glassy CdGeAs2. Des lingots de verre de composition CdGeAs2 ont été obtenu par trempe du liquide préalablement sceffé sous vide. Les modifications de la microstructure du verre et les transformation de phase apparaissant au recuit de cet alliage amorphe ont été étudiées par transmission en microscopie électronique, ainsi que par analyse thermique et diffraction des rayons X. L'examen au microscope électronique révéla la formation de deux phases amorphes dans le verre CdGeAs2, l'une formant une matrice continue, l'autre constituée de fins globules (≈ 40 nm de diametre) dispersée dans la premiére. La nature amorphe des denx phases (matrice et globules) a été confirmée au microscope électronique par microdiffraction des rayons X. Une microanalyse chimique semi-quantitative révéla un rapport Cd/Ge plus grand dans la matrice que dans les globules. La caractérisation des échantillons de l'alliage amorphe CdGeAs2 après traitement thermique suggère la formation d'une phase précurseur, cristalline et métastable, avant la dévitrification conduisant à CdGeAs2 cristallisé et stable. Basé pour les résultats expérimentaux, un mécanisme de décomposition de l'alliage amorphe est proposé." @default.
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- W2054013067 date "1981-01-16" @default.
- W2054013067 modified "2023-10-06" @default.
- W2054013067 title "Amorphous phase separation and transformations in the bulk glassy semiconducting alloy CdGeAs2" @default.
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- W2054013067 doi "https://doi.org/10.1002/pssa.2210630138" @default.
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