Тип публикации: статья из журнала
Год издания: 2025
Идентификатор DOI: 10.1016/j.jallcom.2025.185110
Ключевые слова: thin films, solid-state reaction, in situ electron diffraction, phase transformation, simultaneous thermal analysis, kinetics
Аннотация: Complex investigations of a solid-state reaction process were carried out in bilayer and multilayer thin films of Al/Pt and (Al/Pt)15 by the methods of simultaneous thermal analysis, transmission electron microscopy, in situ electron diffraction, and X-ray diffraction. The solid-state reaction between the aluminum and platinum layeПоказать полностьюrs was found to start with the formation of an amorphous a-Al2Pt phase. The sequence of the phase formation in the solid-state reaction was determined to be the following: Al+Pt→a-Al2Pt→Al3Pt2→Al21Pt8→Al4Pt. Thermokinetic modeling of the solid-state reaction was made in the Al/Pt films under study. The “An” type of reaction (n-dimensional formation of grains followed by crystallite growth) was shown to most accurately correspond to the formation of the a-Al2Pt phase. The formation of the Al3Pt2 phase was revealed to occur in two sequential stages: the first stage corresponds to the “Bna” type of reaction (a chain mechanism of grain formation followed by fast crystallite growth), while the second stage belongs to the “R3” type of reaction (three dimensional diffusion along grain boundaries and/or a reaction on grain boundaries which proceeds according to the type of a contracting sphere). With regard to the Al21Pt8 and Al4Pt phases, their formation process can be best described by a kinetic model which consists of two parallel reactions. The “An” type of reaction corresponds to the formation of the Al21Pt8 phase, with the “Cn-Х” type of reaction (a reaction with autocatalysis with grain formation following the chain mechanism) corresponding to the formation of the Al4Pt phase. Kinetic parameters of the phase formation for a-Al2Pt, Al3Pt2, Al21Pt8 and Al4Pt, were determined, with those for Al21Pt8 and Al4Pt found for the first time.
Журнал: Journal of Alloys and Compounds
Выпуск журнала: Т. 1047
Номера страниц: 185110
ISSN журнала: 09258388
Издатель: Elsevier Science Publishing Company, Inc.