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Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L10-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers / V. G. Myagkov [et al.] // Philos. Mag. - 2014. - Vol. 94, Is. 23. - P. 2595-2622, DOI 10.1080/14786435.2014.926037. - Cited References: 117 . - ISSN 1478-6435. - ISSN 1478-6443

РУБ Materials Science, Multidisciplinary + Mechanics + Metallurgy & Metallurgical Engineering + Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SYNTHESIS
   THIN-FILMS
   PHASE-FORMATION
   MAGNETIC-PROPERTIES
   X-RAY
   MARTENSITIC TRANSFORMATIONS
   PHOTOELECTRON-SPECTROSCOPY
   STRUCTURAL CHARACTERISTICS
   CASIMIR FORCE
   GOLD-FILMS
Кл.слова (ненормированные):
Fe-Pd system -- epitaxial thin film -- inert Ag buffer layer -- diffusion -- solid-state reactions -- L1(0) -- long-range chemical interactions
Аннотация: The effect of 0, 0.5, and 1 μm-thick Ag interlayers on the chemical interaction between Pd and Fe in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1)/MgO(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1)/MgO(0 0 1) trilayers has been studied using X-ray diffraction, 57Fe Mössbauer spectroscopy, X-ray photoelectron spectroscopy, and magnetic structural measurements. No mixing of Pd and Fe occurs via the chemically inert Ag layer at annealing temperatures up to 400 °C. As the annealing temperature is increased above 400 °C, a solid-state synthesis of an ordered L10-FePd phase begins in the Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) film trilayers regardless of the thickness of the buffer Ag layer. In all samples, annealing above 500 °C leads to the formation of a disordered FexPd1−x(0 0 1) phase; however, in samples lacking the Ag layer, the synthesis of FexPd1−x is preceded by the formation of an ordered L12-FePd3 phase. An analysis of the X-ray photoelectron spectroscopy results shows that Pd is the dominant moving species in the reaction between Pd and Fe. According to the preliminary results, the 2.2 μm-thick Ag film does not prevent the synthesis of the L10-FePd phase and only slightly increases the phase’s initiation temperature. Data showing the ultra-fast transport of Pd atoms via thick inert Ag layers are interpreted as direct evidence of the long-range character of the chemical interaction between Pd and Fe. Thus, in the reaction state, Pd and Fe interact chemically even though the distance between them is about 104 times greater than an ordinary chemical bond length.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Mikhlin, Y. L.; Михлин, Юрий Леонидович; Zhigalov, V. S.; Жигалов, Виктор Степанович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Bondarenko, G. N.; Бондаренко, Галина Николаевна
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