Open AccessФононная теплопроводность и фазовые равновесия в наночастицах системы Bi-Sb фрактальной формы
Author(s) -
А.В. Шишулин,
Vladimir Fedoseev,
А.В. Шишулина
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2019.04.47311.343-18
Subject(s) - thermal conductivity , materials science , phonon , homogenization (climate) , nanoparticle , thermoelectric materials , thermoelectric effect , fractal dimension , thermodynamics , condensed matter physics , alloy , component (thermodynamics) , particle (ecology) , lattice (music) , thermal , fractal , composite material , nanotechnology , physics , biodiversity , ecology , mathematical analysis , oceanography , mathematics , geology , acoustics , biology
The thermal conductivity component associated with lattice vibrations is one of the quantities determining the thermoelectric activity of a material. We have simulated the dependences of phase composition and the phonon component of the thermal conductivity associated with it on the shape of nanoparticles of a Bi–Sb alloy with an equiatomic composition and with core–shell configuration. The shape of a particle is simulated by a coefficient corresponding to the extent of deviation of the particle shape from spherical or by its fractal dimension. It is shown that mutual solubilities of components depend on the nanoparticle shape and on the mutual arrangement of coexisting phases, and the thermodynamic equilibrium position for particles with complex morphology corresponds to the homogeneous state. Homogenization of a nanoparticle reduces the phonon component of its thermal conductivity by 70–80%.