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- W2016977268 abstract "The crystallization kinetics of amorphous silicon carbide films was studied by means of X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The films were deposited by radio frequency (r.f.) magnetron sputtering on glassy carbon and single crystalline silicon substrates, respectively. TEM micrographs and XRD patterns show the formation of nano-crystalline β-SiC with crystallite sizes in the order of 50 nm during annealing at temperatures between 1200 and 1600 °C. A modified Johnson–Mehl–Avrami–Kolmogorov (JMAK) formalism was used to describe the isothermal transformation of amorphous SiC into β-SiC as an interface controlled, three-dimensional growth processes from pre-existing small crystallites in the order of 10 nm. These pre-existing crystallites are formed in a transient process in the early stages of crystallization. For films deposited on the silicon substrate, the obtained rate constants of crystallite growth obey an Arrhenius behavior with an activation enthalpy of 4.1 ± 0.5 eV in accordance with literature data. Films deposited on glassy carbon show an increased stability of amorphous SiC films, which is reflected in smaller rate constants of crystallite growth of several orders of magnitude at low temperatures and a higher activation enthalpy of 8.9 ± 0.9 eV. A model is proposed, where the faster crystallization of films on silicon substrates can be explained with the presence of superabundant point defects, which diffuse from the substrate into the film and accelerate the incorporation of atoms from the amorphous into the crystalline phase." @default.
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- W2016977268 date "2005-12-01" @default.
- W2016977268 modified "2023-10-16" @default.
- W2016977268 title "Crystallization kinetics of amorphous SiC films: Influence of substrate" @default.
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- W2016977268 doi "https://doi.org/10.1016/j.apsusc.2005.02.116" @default.
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