of Condensates Gd-Fe
Mycolaychuk O., Lutsyk N., Prysyazhnyuk V., Bubernyak O.
The technological conditions of deposition essentially inflyuence the structure
at obtaining of films by thermal evaporation methods. By changing temperature
of substrate it is possible to obtain amorphous or polycrystalline condensates.
To obtain films with amorphous structure it is necessary to reach intensive
nucleating at undermobility of adsorbed atoms and clusters.
We have explored three compounds: GdFe2,
GdFe5, Gd2Fe17.
Their condensates were obtained by method of the thermal evaporation on
fresh chip of monocrystals NaCl at 300 і 500 Ts.
Electron-diffraction investigations were carried out on the electronic
microscope UEMV-100K. The investigation of thermal stability and kinetics
of crystallization of films was carried out in column of microscope using
attachment PRON-2 with heat rate of 10К/mines. Temperature of appearance
of the most intensive diffraction lines on a background of diffusion aurcole
was registred. It corresponds to starting temperature of crystalline phase.
The electron-diffractions from films of all explored compounds (temperature
of substrate 300 К) are characterized by a diffusion halo. It proves
the existence of amorphous structure of films with prevalence of a uniform
type of the proximate interatomic ordering. The proximate interatomic distances
were determined.
Films were continuos and very finedyspersated, without pores and obvious
infringements of substructure. The decoration of chips of alkali-haloid
monocrystals is not revealed. It proves a low surface diffusion of adsorbed
atoms in a precipitation process.
Amorphous films of system Gd-Fe have high spalling resistance. The crystallization
of amorphous films GdFe2 begins at temperature
720K. Amorphous structure of films GdFe5
is stable even at temperature 850K.
Films obtained at temperature of substrate 500K have a finedyspersated
polycrystalline structure. The interplanar distances and structures of
explored films were determined.
