Interfacial Reactions and Thermal Stability of Ultrahigh Vacuum Deposited Multilayered Mo/Si Structures


Interfacial reactions and thermal stability of ultrahigh vacuum deposited multilayered Mo/Si structures have been investigated by high resolution transmission electron microscopy in conjunction with fast Fourier transform and auto–correlation function analysis. For samples with nominal atomic ratios Mo:Si = 1:2 and 3:1, well defined multilayered Mo/Si structures were obtained after annealing at 250 °C for 30 min. On the other hand, distinct multilayered MoSi2/Si structure was formed only for Mo:Si = 1:2 samples after annealing at 650 °C for 1 h.

Multiphases were observed to form simultaneously in samples annealed at 400–500 °C. After 650 °C annealing for 1 h, tetragonal MoSi2 was the only silicide phase observed for the Mo:Si = 1:2 samples, whereas both tetragonal and hexagonal MoSi2 were present in Mo:Si = 3:1 samples. The stability of the multilayered Mo/Si structures was found to depend critically on the atomic ratios of constituent elements, bilayer period and annealing conditions. The results are interpreted in terms of the delicate balance between intermixing of constituent atoms and silicide formation.

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Liang, J.M., Chen, L.J. Interfacial Reactions and Thermal Stability of Ultrahigh Vacuum Deposited Multilayered Mo/Si Structures. MRS Online Proceedings Library 382, 357 (1995).

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