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Принцип длинных волн и фононные спектры кубических кристаллических решёток

Authors: Kholodovsky, V. E.; Machikhina, I. O.;

Принцип длинных волн и фононные спектры кубических кристаллических решёток

Abstract

Получена и решена система уравнений, описывающая колебания моноатомных ОЦК и ГЦК решеток при силовом взаимодействии, имеющем ван-дер-ваальсовскую природу. Показано, что данная система позволяет реализовать принцип длинных волн, согласно которому уравнения колебаний кристаллической решетки должны сводиться к уравнениям распространения волн упругих деформаций в кристалле как в сплошной среде. Сравнение полученных и классических уравнений позволило выразить силовые константы динамической модели через упругие константы рассматриваемого вещества и произвести расчеты фононных спектров некоторых кристаллов с ОЦК и ГЦК решеткой. In the article the authors obtain and solve a system of equations, describing vibrations of the monoatomic body-centered and face-centered cubic lattices during the force interaction possessing van der Waals nature. They demonstrate that the system allows implement of the long waves principle according to which the equations of crystal lattice vibrations are to resolve themselves into the equations of elastic deformation wave propagation in a crystal as in the continuous medium. The comparison of the received and classical equations allows to show the force constants of the dynamical model in terms of elastic constants of a given substance, and to calculate the phonon spectra of some body-centered and facecentered cubic lattices crystals. Kholodovsky Vladimir Evgenievich - Cand.Sc.(Physics and Mathematics), Associate Professor of the Mathematical Analysis Department, I.G. Petrovskij Bryansk State University. Холодовский Владимир Евгеньевич - кандидат физико-математических наук, доцент кафедры математического анализа, Брянский государственный университет им. академика И.Г. Петровского. e-mail: tfbgubry@mail.ru Machikhina Inna Olegovna - Graduate Student at the Theoretical Physics Department, I.G. Petrovskij Bryansk State University. Мачихина Инна Олеговна - аспирант кафедры теоретической физики, Брянский государственный университет им. академика И.Г. Петровского. e-mail: ingibordit@yandex.ru Брянский государственный университет им. академика И.Г. Петровского

Country
Russian Federation
Keywords

crystal lattice, дисперсионные кривые, кристаллическая решетка, elastic constants, динамическая модель, дисперсионные соотношения, dynamic model, spectrum, фононный спектр, dispersion relations, упругие константы, диполь, УДК 534.1, dispersion curves, dipole

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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