Abstract

The phase transition and microstructure of as-deposited Fe-B, Co-B and Fe-Co-B alloy films on copper, mica, glass and NaCl single crystals were examined by differential scanning calorimeter and transmission electron microscopy respectively. The microstructure appears to be either in the amorphous state or in a partially crystallized state according to the composition of the films. It was found that FeB and Fe 3B are formed when the Fe-B binary alloy films are annealed at 132°C for 2 h, and that α-Fe microcrystals are found when the annealing temperature is was raised to 360°C. In the case of Co-B films, α-Co and CoB coexist in the as-deposited films. The α-Co phase transforms into the Co(FCC) phase after annealing at a temperature above 500°C and the Co 3B phase is also formed at the same time. The (Fe,Co)B and α-Fe microcrystals are observed when the (Fe 0.6Co 0.4) 2B films are annealed at 360°C.

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