Nonlinear supratransmission in a Pt3Al crystal at intense external influence

Cherednichenko, A. I.; Zakharov, Pavel; Старостенков, М. Д.; Sysoeva, Margarita Olegovna; Eremin, A. M.

doi:10.20537/2076-7633-2019-11-1-109-117

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…They combine chemical activity with high strength characteristics. Furthermore, our previous work has shown that a range of crystals based on these elements can sustain discrete breathers and soliton-like waves [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Localized modes in platinum aluminides

Cherednichenko,

Bebikhov,

Semenov

et al. 2024

J. Phys.: Conf. Ser.

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Platinum aluminides have the prospect of being used as both functional and structural materials for a range of scientific and technical tasks. They possess unique properties that make them effective catalysts. The dynamics of the crystal lattice play an important role in the manifestation of these properties. In this study, an analysis of the density of phonon states of crystals and the possibility of the existence of localized lattice vibrations in Al and Pt alloys is conducted using atomistic modeling. The following compounds are considered: AlPt, Al2Pt, Al3Pt, AlPt2, Al3Pt5, AlPt3 (four types of lattices). The calculated phonon spectra allow for the assessment of the possibility of the existence of nonlinear localized modes in the forbidden zone of the spectrum, if it is present. It is shown that a number of crystals within the framework of the considered formalism and interatomic potential can have a forbidden zone. This condition, together with the nonlinearity of the bonds, ensures the existence of highly-amplitude localized modes in the following compounds: AlPt3, AlPt3(1), AlPt3(2), AlPt3(3). It is also established that in the Al3Pt5 alloy, the existence of prolonged high-amplitude excitations on the Al atom is possible.

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Section: Introductionmentioning

confidence: 99%

Localized modes in platinum aluminides

Cherednichenko,

Bebikhov,

Semenov

et al. 2024

J. Phys.: Conf. Ser.

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“…В работах [48,49] нами было показано для Pt 3 Al проявление эффекта супратрансмиссии. Установлено смещение границы поглощения при увеличении амплитуды воздействия.…”

Section: Introductionunclassified

Molecular dynamic analysis of energy transport in a Pt3Al crystal under the impact in the spectrum gap frequency

Zakharov

Korznikova

2021

Lett. Mater.

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Сonstant search for new mechanisms of energy transport associated with a decrease in losses results in the active investigation of the possibilities of generating mobile excitations at frequencies outside the phonon spectrum. The effect of energy transfer at frequencies outside the band, possible in case if the excitation amplitude exceeds the critical value, was previously actively studied in reduced dimension systems. In this work, for the first time, the possibility and features of energy transfer at frequencies outside the phonon spectrum of a crystal are studied on the Pt 3 Al biatomic lattice, the corresponding excitations in which are created through the implementation of harmonic vibrations at frequencies lying in the phonon spectrum gap. It was found that as a result of the initial impact, the parameters of which lie in the band gap, at the first stage, discrete breathers are formed on aluminum atoms lying in the immediate vicinity of the impact zone. The threshold value of the energy required to excite breathers, determined by the amplitude and frequency of exposure, decreases as the frequency approaches the boundary of the slit in the spectrum. At the second stage, after the end of the harmonic action, a soliton-like wave is formed, moving along the crystal with an average speed of 4.5 km / s. The wave velocity is practically independent of the initial disturbance amplitude. The shape and amplitude of the moving wave are weakly dependent on the initial frequency. Significant differences in the profile and a tendency to bimodality were revealed only when exposed to frequencies close to the lower limit of the spectrum. The results obtained contribute to a fundamental understanding of the features of the propagation of elastic disturbances in nonlinear media in case of forbidden zones region impacts.

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Energy supply into a semi-infinite $$\beta $$-Fermi–Pasta–Ulam–Tsingou chain by periodic force loading

Liazhkov

2024

Acta Mech

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Nonlinear supratransmission in a Pt3Al crystal at intense external influence

Cited by 11 publications

References 14 publications

Localized modes in platinum aluminides

Localized modes in platinum aluminides

Molecular dynamic analysis of energy transport in a Pt3Al crystal under the impact in the spectrum gap frequency

Energy supply into a semi-infinite $$\beta $$-Fermi–Pasta–Ulam–Tsingou chain by periodic force loading

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