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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Effect of the structural properties on the electrical resistivity of the Al/Ag thin films during the solid-state reaction
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-13-00080]
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 4. - P.708-713. - ISSN 1063-7834, DOI 10.1134/S1063783420040034. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 43. - This study was supported by the Russian Science Foundation, project no. 18-13-00080.
Предметные рубрики: LIGHT-EMITTING-DIODES
PHASE-FORMATION
AG
AL
DIFFUSION
SUPPRESSION
INTERFACE
SURFACE
GROWTH
HEAT
Аннотация: Based on the results of in situ electron diffraction study of the solid-state reaction and electrical resistivity measurements on the Al/Ag thin films with an atomic ratio of Al : Ag = 1 : 3, the temperature of the reaction onset has been established and a model of the structural phase transitions has been proposed. The solid-state reaction begins at 70°C with the formation of the Al–Ag solid solution at the interface between the aluminum and silver nanolayers. It has been found that, in the course of the reaction, the intermetallic compounds γ-Ag2Al → μ-Ag3Al are successively formed. It is shown that the possibility of the formation of the μ‑Ag3Al phase during the solid-state reaction in the Al/Ag thin films depends on the aluminum-to-silver ratio, while the formation of the μ-Ag3Al phase begins only after all fcc aluminum has reacted.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : Formation of the atomically ordered L10 structure with the [001] orientation during the solid-state reaction in Fe/Pd bilayer thin films
Коллективы : Russian Foundation for Basic Research [14-03-00515, 16-32-00225, 16-38-60075]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 6. - P.1233-1237. - ISSN 1063-7834, DOI 10.1134/S1063783417060154. - ISSN 1090-6460(eISSN)
Примечания : Cited References:21. - This study was supported by the Russian Foundation for Basic Research, projects nos. 14-03-00515, 16-32-00225, and 16-38-60075.
Предметные рубрики: MAGNETIC-FIELD
SINGLE-CRYSTAL
FEPT FILMS
Аннотация: The formation of the atomically ordered L10-FePd structure during the solid-state reaction in Fe/Pd bilayer thin films is in situ investigated by electron microscopy and electron diffraction analysis. The initial iron and palladium layers were mainly coherently oriented crystallites with the orientation relationship α-Fe (001)[110] || Pd(001)[100]. It is established that the solid-state reaction between the iron and palladium layers upon heating at a rate of 4–8°C/min starts with the formation of the FePd solid solution at 390°C; at 430°C, the formation of the atomically ordered L10-FePd structure is observed. It is shown that at the low heating rate (4–8°C/min), the L10-FePd structure with the [001] orientation relative to the film plane forms, while at the high heating rate (50°C/min) it forms with the [100], [010], and [001] orientations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : In situ electron diffraction and resistivity characterization of solid state reaction process in Cu/Al bilayer thin films
Место публикации : Metall. Mat. Trans. A. - 2020. - Vol. 51, Is. 3. - P.1428-1436. - ISSN 10735623 (ISSN), DOI 10.1007/s11661-019-05602-5
Примечания : Cited References: 52. - The authors wish to thank the financial support from the Russian Science Foundation (Grant #18-13-00080)
Аннотация: Solid state reaction processes in Cu/Al thin films have been studied using the methods of in situ electron diffraction and electrical resistivity measurements. The solid state reaction in the Cu/Al thin films has been found to begin already at 88 °C with the formation of the Al2Cu phase in the process of thermal heating in vacuum. The phase sequence at the solid state reaction in the films under study has been determined to be the following: Al2Cu → AlCu → Al4Cu9. A model has been suggested for describing the initial formation stage of intermetallic compounds at the solid state reaction in Cu/Al thin films. According to this model, at the initial stage, the intermetallic compounds are formed as separate crystallites at the interface in the Cu/Al thin films. The suggested model can be applied both to the formation of the first phase, Al2Cu, and to the subsequent phases: AlCu and Al4Cu9. For the Al4Cu9 phase the temperature coefficient of the electrical resistivity has been determined to be equal to αAl4Cu9= 1.1 × 10−3 K−1.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Moiseenko E. T., Altunin R. R., Zeer G. M.
Заглавие : In situ transmission electron microscopy and electron diffraction investigation of solid-state reactions and atomic ordering in Cu/Au bilayer nanofilms
Место публикации : J. Sib. Fed. Univ. Chem. - 2013. - Vol. 6, Is. 3. - P.230-240; Журн. СФУ. Сер. "Химия"
Ключевые слова (''Своб.индексиров.''): cu/au nanofilm--intermetallics--solid state reaction--phase transition--atomic ordering--superstructure--нанопленка cu/au--интерметаллиды--твердофазная реакция--фазовый переход--атомное упорядочение--сверхструктура
Аннотация: Solid-state reaction processes and atomic ordering in Cu/Au bilayer nanofilms (with the atomic ratio Cu:Au≈50:50) have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 700 ºС at a heating rate of 4-8 ºС/min. The solid-state reaction between the nanolayers of copper and gold has been established to begin at 180 ºС. The process of atomic ordering has been shown to start simultaneously with the process of the formation of the disordered phase of Cu50Au50 at 245 ºС. The formation processes of the ordered phases of: CuAuI (L10 superstructure) and CuAuII (long period superstructure) have been studied, as well as the phase transition processes: disorder - order (the transition of the disordered structure into the ordered one) and order - disorder (the transition of the ordered structure into the disordered one).Методами просвечивающей электронной микроскопии и дифракции электронов проведены in situ-исследования процессов твердофазных реакций и атомного упорядочения в двухслойных нанопленках Cu/Au (с атомным соотношением Cu:Au≈50:50) при нагреве от комнатной температуры до 700 ºС при скорости нагрева 4-8 ºС/мин. Установлено, что твердофазная реакция между нанослоями меди и золота начинается при 180 ºС. Показано, что процесс атомного упорядочения начинается одновременно с процессом формирования неупорядоченной фазы Cu50Au50 при 245 ºС. Исследованы процессы формирования атомно-упорядоченных фаз: CuAuI (L10 сверхструктура) и CuAuII (длинно-периодическая сверхструктура), а также процессы фазовых переходов беспорядок-порядок (переход неупорядоченной структуры в атомно-упорядоченную) и порядок-беспорядок (переход атомно-упорядоченной структуры в неупорядоченную)
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N.
Заглавие : In situ transmission electron microscopy and electron diffraction investigations of solid-state reactions in thin-film nanosystems
Коллективы : International symposium on self-propagating high temperature synthesis (12; 2013 ; Oct. ; 21–24; South Padre Island, USA )
Место публикации : XII Int. symp. self-propagat. high temper. synth. (SHS-2013): book of abstracts/ org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2013. - P.203-204
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Semenova Yu. G., Moiseenko E. T., Varnakov S. N.
Заглавие : In situ transmission electron microscopy investigations of solid-state synthesis in thin films
Коллективы : International symposium on self-propagating high temperature synthesis
Место публикации : XI Int. symp. self-propagat. high temp. synth. (SHS-2011): book of abstracts. - 2011. - Ст.4C-2. - P.78-79. - ISBN 978-5-6040595-4-8
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N., Yakovlev I. A., Tarasov I. A., Ovchinnikov S. G.
Заглавие : In-situ transmission electron microscopy and electron diffraction investigations of solid-state reactions in Fe3 Si(111)/Si(111) films
Коллективы : International symposium on self-propagating high temperature synthesis
Место публикации : Int. symp. on self-propagating high temperature synthesis (SNS XIII): abstract book. - 2015. - Ст.1139. - P.81-82
Примечания : The work was partly supported by the Russian Foundation for Basic Research (grants №№ 13-02-01265a, 140300515a) and the Ministry of Education and Science of the Russian Federation (grant № 2014/71/1763 in the framework of the state assignment for Siberian Federal University for 2014-2016).
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N., Yakovlev I. A., Tarasov I. A., Ovchinnikov S. G.
Заглавие : In-situ transmission electron microscopy and electron diffraction investigations of solid-state reactions in Fe3 Si(111)/Si(111) films
Коллективы : International symposium on self-propagating high temperature synthesis
Место публикации : Int. Symp. on Self-propag. High-Temp. Synth. SHS XIII: Oct. 12-15, 2015, Antalya / Türkiye. - 2015. - Ст.Abstract:1139. - P.81
Примечания : The work was partly supported by the Russian Foundation for Basic Research (grants ## 13-02-01265a, 140300515a) and the Ministry of Education and Science of the Russian Federation (grant #2014/71/1763 in the framework of the state assignment for Siberian Federal University for 2014-2016)
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N., Ovchinnikov S. G.
Заглавие : In-situ transmission electron microscopy ivestigation of solid-state reactions in Fe/Si multilayer nanofilms
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 41. - ISBN 978-5-7444-3124-2
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Yumashev V. V., Moiseenko E. T., Belousov O. V., Solovyov L. A., Volochaev M. N., Zeer G. M.
Заглавие : Kinetic study of a solid-state reaction in Ag/Al multilayer thin films by in situ electron diffraction and simultaneous thermal analysis
Коллективы : Russian Science Foundation, RussiaRussian Science Foundation (RSF) [181300 080]
Место публикации : J. Alloys Compd. - 2021. - Vol. 871. - Ст.159474. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2021.159474. - ISSN 1873-4669(eISSN)
Примечания : Cited References: 47. - This work was supported by the Russian Science Foundation, Russia under grant #181300 080
Предметные рубрики: STRUCTURAL PHASE-TRANSFORMATIONS
COMMITTEE RECOMMENDATIONS
ICTAC KINETICS
Аннотация: A solid-state reaction process in Ag/Al multilayer thin films has been investigated by the methods of in situ electron diffraction, simultaneous thermal analysis, transmission electron microscopy and X-ray diffraction with the aim of studying the phase formation kinetics of intermetallic compounds. The sequence of the phase transformations in the solid-state reaction has been established: Ag+Al→(Ag)+(Al)→(Ag)+δ-Ag2Al→μ-Ag3Al. The process of the solid-state interaction has been shown to consist of two steps; each of them is described by a kinetic model of the nth order reactions with autocatalysis. The kinetic parameters of the autocatalytic process of the phase formation for δ-Ag2Al and µ-Ag3Al, have been determined, in particular, their apparent activation energy: 126 kJ/mol and 106 kJ/mol, respectively.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Moiseenko E. T., Altunin R. R.
Заглавие : L10 ordered phase formation at solid state reactions in Cu/Au and Fe/Pd thin films
Место публикации : J. Solid State Chem. - 2019. - Vol. 269. - P.36-42. - ISSN 00224596 (ISSN) , DOI 10.1016/j.jssc.2018.09.009
Примечания : Cited References: 36. - The investigation of Cu/Au system was conducted under the financial support of the Russian Science Foundation (Grant #18-13-00080) and the investigation of Fe/Pd system was supported by the Russian Foundation for Basic Research (Grant #18-03-01173).
Ключевые слова (''Своб.индексиров.''): thin film solid state reaction--intermetallic compound--l10 type ordered structure--order/disorder transformation--in situ ed
Аннотация: To understand the mechanism of mass transfer during solid state reactions and order-disorder transitions the formation processes of CuAuI and L10-FePd ordered structures at solid state reactions in Cu/Au и Fe/Pd bilayer thin films have been carried out using the method of in situ electron diffraction (ED). The value of the long-range order (LRO) parameter has been estimated for the L10 type ordered structures being formed; the order-disorder transition temperatures have been determined. The formation mechanism of the L10 type ordered structures formed at the initial stages of the solid state reaction in the Cu/Au and Fe/Pd thin films has been suggested. In the case of Cu/Au it has been shown that the interdiffusion of copper and gold at the initial stage of the solid state reaction results in the reduced size of the grains of the initial materials, as a result, nanocrystalites of the Cu-Au solid solution are formed, and further, grains of the CuAuI ordered solid solution appear and their growth begins.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Zharkov S. M., Altunin R. R., Belousov O. V., Solovyov L. A., Yumashev V. V., Volochaev M. N., Zeer G. M.
Заглавие : Peculiarities of Intermetallic Phase Formation in the Process of a Solid State Reaction in (Al/Cu)n Multilayer Thin Films
Место публикации : JOM. - 2021. - Vol. 73, Is. 2. - P.580-588. - ISSN 10474838 (ISSN), DOI 10.1007/s11837-020-04522-9
Примечания : Cited References: 44. - This work was supported by the Russian Science Foundation under Grant #18-13-00080. The electron microscopy investigations were conducted in the SFU Joint Scientific Center whose infrastructure was supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation. The preparation of cross-section samples for TEM investigations was conducted in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: Phase formation in a solid state reaction in Al/Cu bilayer and multilayer thin films was studied by the methods of in situ transmission electron microscopy, electron diffraction, simultaneous thermal analysis and x-ray diffraction. It was established that the phase formation sequences in the (Al/Cu)n (n = 2, 15) multilayer thin films (θ-Al2Cu → γ1-Al4Cu9 → η2-AlCu) and Al/Cu bilayer thin films (θ-Al2Cu → η2-AlCu → γ1-Al4Cu9) were different. It was assumed that the phase formation process in the thin films was strongly affected by a number of copper/aluminum interfaces due to the changes of aluminum and copper diffusion current.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Yumashev V. V., Altunin R. R., Zeer G. M., Nikolaeva N. S., Belousov O. V., Zharkov S. M.
Заглавие : Solid-state reaction in Cu/a-Si nanolayers: A comparative study of STA and electron diffraction data
Место публикации : Materials. - 2022. - Vol. 15, Is. 23. - Ст.8457. - ISSN 19961944 (eISSN), DOI 10.3390/ma15238457
Примечания : Cited References: 45. - This work was supported by the Russian Science Foundation under grant # 22-13-00313
Аннотация: The kinetics of the solid-state reaction between nanolayers of polycrystalline copper and amorphous silicon (a-Si) has been studied in a Cu/a-Si thin-film system by the methods of electron diffraction and simultaneous thermal analysis (STA), including the methods of differential scanning calorimetry (DSC) and thermogravimetry (TG). It has been established that, in the solid-state reaction, two phases are formed in a sequence: Cu + Si → η″-Cu3Si → γ-Cu5Si. It has been shown that the estimated values of the kinetic parameters of the formation processes for the phases η″-Cu3Si and γ-Cu5Si, obtained using electron diffraction, are in good agreement with those obtained by DSC. The formation enthalpy of the phases η″-Cu3Si and γ-Cu5Si has been estimated to be: ΔHη″-Cu3Si = −12.4 ± 0.2 kJ/mol; ΔHγ-Cu5Si = −8.4 ± 0.4 kJ/mol. As a result of the model description of the thermo-analytical data, it has been found that the process of solid-state transformations in the Cu/a-Si thin-film system under study is best described by a four-stage kinetic model R3 → R3 → (Cn-X) → (Cn-X). The kinetic parameters of formation of the η″-Cu3Si phase are the following: Ea = 199.9 kJ/mol, log(A, s−1) = 20.5, n = 1.7; and for the γ-Cu5Si phase: Ea = 149.7 kJ/mol, log(A, s−1) = 10.4, n = 1.3, with the kinetic parameters of formation of the γ-Cu5Si phase being determined for the first time.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T.
Заглавие : Solid-state reactions in Al based multilayer nanosystems
Коллективы : International symposium on self-propagating high temperature synthesis
Место публикации : International symposium on self-propagating high temperature synthesis (15 ; 2019 ; Sept. ; 16-20 ; Moscow). XV International symposium on self-propagating high temperature synthesis (SHS-2019): book of abstracts. - 2019. - P.561-562. - ISBN 978-5-6040595-4-8, DOI 10.24411/9999-0014A-2019-10204
Примечания : Самораспространяющийся высокотемпературный синтез (загл. конф.)
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Zeer G. M., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Solid-state reactions in Fe/Si multilayer nanofilms
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.144-149. - ISSN 1662-9779, DOI 10.4028/www.scientific.net/SSP.215.144. - ISSN 978-303835054-5
Примечания : Cited References: 16. - The work was supported by the Presidium of RAS (project No. 24.34), the Russian Foundation for Basic Research (grant #13-02-01265)
Ключевые слова (''Своб.индексиров.''): fe/si multilayer nanofilm--intermetallics--solid state reaction--phase transition--magnetic properties--electron diffraction--transmission electron microscopy
Аннотация: Solid-state reaction processes in Fe/Si multilayer nanofilms have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 900ºС at a heating rate of 8-10ºС/min. The solid-state reaction between the nanolayers of iron and silicon has been established to begin at 350-450ºС increasing with the thickness of the iron layer.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : Solid-state synthesis and atomic ordering in thin Cu/Au films (Atomic Ratio, Cu : Au = 3 : 1)
Место публикации : Bull. Russ. Acad. Sci.: Phys.: Allerton Press, 2012. - Vol. 76, Is. 10. - P.1149-1151. - ISSN 1062-8738, DOI 10.3103/S1062873812100073
Ключевые слова (''Своб.индексиров.''): atomic ordering--atomic ratio--bi-layer--in-situ transmission--nano films--solid-state synthesis--space groups--atoms--gold--in situ processing--transmission electron microscopy--copper
Аннотация: In situ transmission electron microscopy investigations of the processes of solid-state synthesis and atomic ordering in bilayer Cu/Au nanofilms (atomic ratio, Cu : Au = 3 : 1) are conducted. It is found that solid-state synthesis starts at 170В°C. A Cu 3Au atomic-disordered structure (Fm3m space group; lattice con- stant, a = 3.76 В± 0.01 A) forms at 280В°C. Annealing the film for 1 hour at 380В°C produced a Cu 3AuI (L1 2 type) atomic-ordered superstructure, a Pm-3m space group, and lattice constant, a = 3.76 В± 0.01 a in the bulk of the film.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Structural phase transformations during a solid-state reaction in a bilayer Al/Fe thin-film nanosystem
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 1. - P.200-205. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783420010059
Примечания : Cited References: 36. - This study was supported by the Russian Foundation for Basic Research, project no. 18-03-01173a
Аннотация: The processes of phase formation during a solid-state reaction between Fe and Al nanolayers have been investigated by the in situ electron diffraction method. It is established that the solid-state reaction at the interface between iron and aluminum nanolayers begins at ≈100°C with the formation of a disordered Al solid solution in α-Fe. It is shown that intermetallic phases (FeAl6 and/or Fe2Al5, FeAl, and Fe3Al) are successively formed upon further heating.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Structural phase transformations in Al/Pt bilayer thin films during the solid-state reaction
Коллективы : Russian Foundation for Basic Research [16-33-00475 mol_a]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 7. - P.1413-1418. - ISSN 1063-7834, DOI 10.1134/S106378341807003X. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, project no. 16-33-00475 mol_a.
Предметные рубрики: AL
SYSTEM
MULTILAYERS
ALUMINUM
HEAT
Аннотация: A sequence of phases forming during the solid-phase reaction in Al/Pt bilayer thin films has been investigated by in situ electron diffraction. It is shown that the amorphous PtAl2 phase forms first during the solid-phase reaction initiated by heating. Upon further heating, PtAl2, Pt2Al3, PtAl, and Pt3Al crystalline phases sequentially form, which is qualitatively consistent with an effective formation heat model. The content of phases forming during the reaction has been quantitatively analyzed and the structural phase transformations have been examined.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Moiseenko E. T., Altunin R. R., Nikolaeva N. S., Zhigalov V. S., Myagkov V. G.
Заглавие : Study of solid-state reactions and order-disorder transitions in Pd/α-Fe(001) thin films
Коллективы : Russian Foundation for Basic Research [14-03-00515a]; Ministry of Education and Science of the Russian Federation
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 7. - P.405-409. - ISSN 0021-3640, DOI 10.1134/S0021364014070145. - ISSN 1090-6487
Примечания : Cited References: 20. - This work was supported in part by the Russian Foundation for Basic Research (project no. 14-03-00515a) and by the Ministry of Education and Science of the Russian Federation (state contract for the Siberian Federal University for 2014).
Предметные рубрики: MAGNETIC-PROPERTIES
PHASE
Fe
Аннотация: The formation of the hard-magnetic ordered L10-FePd phase in thin bilayer Pd/α-Fe(001) films has been experimentally studied. Solid-state reactions initiated by thermal heating in bilayer Pd/α-Fe(001) films with a thickness of 50–60 nm (the atomic ratio Pd: Fe ≈ 50: 50) separated from the substrate have been studied using the in situ electron diffraction methods. It has been shown that the solid-state reaction between the palladium and iron layers in Pd/α-Fe(001) starts at 400°C with the formation of the disordered Fe-Pd phase. At 480°C, the ordered L10-FePd phase is formed. The order-disorder phase transition has been studied. It has been established that the transition of the ordered L10-FePd phase to the disordered FePd phase starts at 725°C. At 740°C, only the disordered FePd phase is present over the whole volume of the film. The observed temperature of the order-disorder phase transition is shifted from the equilibrium value by 35°C to higher temperatures. This effect is assumingly associated with the higher concentration of palladium atoms at the boundaries of the Fe-Pd crystal grains owing to the grain-boundary adsorption.
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