A nanocomposite film consisting of crystalline CuSe and amorphous selenium (a-Se) was obtained by vacuum-thermal deposition. It has been shown for the first time that thermal heating of a CuSe/a-Se nanocomposite film in vacuum can transform it into a textured CuSe(006) film. It has been established that at a temperature of 438 K, CuSe crystallites grow intensively in the (006) crystallographic plane. Using the X-ray diffraction analysis method and the technique for measuring the electrical resistance of the CuSe/a-Se composite film, the phase transformation temperatures at which monoclinic Se8, trigonal t-Se, orthorhombic CuSe2, and hexagonal CuSe are formed.
Experimental results of a study concerned with solid-phase reactions and phase transformations in a Bi/Se nanoscale film structure under heat treatment in vacuum are presented. Nanocrystalline Bi2Se3, BiSe, and Bi_4Se_3 films are obtained for the first time by solid-phase synthesis at various ratios between the Bi and Se layer thicknesses. The phase-transformation temperatures at which Se, BiSe, and Bi4Se3 crystalline phases are formed are determined. The average crystallite sizes in the Bi_2Se_3, BiSe, and Bi_4Se_3 films are found to be 21, 23, and 33 nm, respectively.
The results of experimental studies of the phase transformation in composite films of the Se-Cu system obtained in vacuum as a result of the sequential thermal deposition of selenium and copper on a glass substrate are presented. At a fixed thickness of the selenium layer (45 nm), the effect of the thickness of the copper layer (40 - 115 nm) on the phase composition of the synthesized films formed as a result of explosive crystallization occurring during the interaction of hot copper clusters with low-melting selenium was studied. It was found that the subsequent thermal annealing of the synthesized films is accompanied by a significant change in their phase composition and optical transmission spectra.
Представлены результаты экспериментальных исследований фазового превращения в композитных пленках системы Se-Cu, полученных в вакууме в процессе последовательного термического осаждения селена и меди на стеклянную подложку. При фиксированной толщине слоя селена (45 нм) исследовалось влияние толщины слоя меди (40-115 нм) на фазовый состав синтезированных пленок, формируемых в процессе взрывной кристаллизации, происходящей при взаимодействии горячих кластеров меди с легкоплавким селеном. Установлено, что последующий термический отжиг синтезированных пленок сопровождается существенным изменением их фазового состава и спектров оптического пропускания. Ключевые слова: фазовые превращения, композитные пленки системы Se-Cu, взрывная кристаллизация, термический отжиг, оптические свойства.
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