Ni1.297Te PHONON LOCALIZATIONS IN Bi2Те2,70,3 CRYSTALS
S.R. Azimova, N.M. Abdullaev
2024   02   az   p.10-13

ABSTRACT

A number of samples were obtained by the electrolytic method by introducing Ni2+ cations into layers of the thermoelectric material Bi2Te2.7Se0.3. The dynamics of the decrease in the heat transfer coefficient have been revealed. A new mode of optical phonon, formed at the boundary of Ni1.297Te clusters in vacancies of the Van-der-Waals layer, causes a decrease in thermal conductivity. Due to the influence of small-sized effects formed by Ni1.297Te nanodots in the crystal, the heat transfer coefficient - thermal conductivity decreases from ~42 to 35 W/(m×K) along the plane of the layer. It has been shown that different degrees of phonon localization lead to a decrease in thermal conductivity.

Keywords: thermal conductivity, quantum dots, cluster, vacancy, phonon localization.
PACS: 62.20Fe,61.72.Cc,61.72.Lk

DOI:-

Received: 30.04.2024
Internet publishing: 27.06.2024

AUTHORS & AFFILIATIONS

1. Institute of Physics named after H.M.Abdullayev of the Ministry of Science and Education Republic of Azerbaijan AZ-1143, Baku, 131, H.Javid ave.
E-mail: sevinc_azimova_82@mail.ru

Graphics and Images

           

Fig.1       Fig.2      Fig.3      Fig.4

REFERENCIES

[1]  https://vt-metall.ru/articles/919-teploprovodnost-metallov/.
[2]  A.M. Həşimov, S.R. Əzimova, K.Ş. Qəhrəmanov, Y.Q. Əsədov, S.Ş. Qəhrəmanov, M.A. Həsənov, N.M. Abdullayev. Yeni nanokristallik skrukturlar əsasında termoelektrik nazik təbəqələrin işlənməsi, “Elektrotexnikanın texniki və fiziki problemləri” mövzusunda 15-ci Beynəlxalq Konfrans ICTPE-2019, İstanbul Rumeli Universiteti Türkiyə,səh.108-112.
[3]  L.D. Gulay, I.D. Olekseyuk. Crystal structures of the compounds Ni3Te2, Ni3−δTe2 (δ=0.12) and Ni1.29Te Journal of Alloys and Compounds Volume 376, Issues 1–2, 2004, p. 131-138.
[4]  S.R. Azimova, Sh.S. Ismayilov, I. Gasimoglu, N.M. Abdullayev. Bi2Те2,7Sе0,3 crystal conductivity peculiarities, AJP Fizika 2022, volume XXVIII № 1, section En, p.58-60.
[5]  S.R. Əzimova, A.M. Abdullayev. Bi2Te2.7Se0.3 laylarında kristallik özəklərin və nanoməftillərin formalaşma xüsusiyyətləri, AJP Fizika, 2021, Sec. Az. vol XXVII, № 4, səh. 46-50.
[6]  S.R. Əzimova, N.M.Abdullayev. Bi2Te2.7Se0.3 laylı kristallarında fonon dinamikası, “Fizikanin və astronomiyanın müasir problemləri” mövzusunda respublika elmi konfransı, Naxçıvan 2021, səh.115.
[7]  N.B. Singh, Richa Tomar. Yarımkeçirici kvant nöqtələri, 2020, 26 səh. DOI: https://doi.org/10.21741/9781644901250-12.
[8]  N.B. Singh, Richa Tomar. Semiconductor Quantum Dots, Materials Research Foundations, 2021, Vol. 96, p. 305-330.