alternativeАльтернативная энергетика и экология (ISJAEE)Alternative Energy and Ecology (ISJAEE)1608-8298Международный издательский дом научной периодики "Спейс10.15518/isjaee.2025.09.057-074alternative-2715Research ArticleI. ВОЗОБНОВЛЯЕМАЯ ЭНЕРГЕТИКА. 7. Нетрадиционные источники возобновляемой энергии. 7-16-0-0 Термоградиентная энергетикаI. RENEWABLE ENERGY. 7. Unconventional sources of renewed energy. 7-16-0-0 Thermogradient energyОсобенности термоэлектрических свойств композитов на основе Bi 0,5Sb1,5Te3 с субмикронными включениями NiTe2Features of the thermoelectric properties of composites based on Bi 0,5Sb1,5Te3 with submicron NiTe2 inclusionshttps://orcid.org/0009-0007-6380-155XПавловА. А.PavlovA. A.

Павлов Александр Алексеевич, аспирант кафедры экспериментальной и теоретической физики

308015, г. Белгород, ул. Победы, 85 

Pavlov Alexander Alekseevich, Postgraduate student at the Department of Experimental and Theoretical Physics

308015, Belgorod, Pobedy street, 85

ЖуйВанRuiWang

Жуй Ван, аспирант кафедры экспериментальной и теоретической физики

308015, г. Белгород, ул. Победы, 85 

Rui Wang, Postgraduate student at the Department of Experimental and Theoretical Physics

308015, Belgorod, Pobedy street, 85

https://orcid.org/0000-0001-8791-8102ЯпрынцевМ. Н.YapryntsevM. N.

Япрынцев Максим Николаевич, канд. физ.- мат. наук, доцент кафедры «Материаловедения и нанотехнологий», научный сотрудник Центра коллективного пользования «Технологии и материалы»

308015, г. Белгород, ул. Победы, 85, тел.: +7 999 700 75 30 

Yapryntsev Maxim Nikolaevich, Candidate of Physical and Mathematical Sciences, Associate Professor at the Department of Materials Science and Nanotechnology, Research Fellow at the Technologies and Materials Center

308015, Belgorod, Pobedy street, 85, tel.: +7 999 700 75 30 

yaprintsev@bsuedu.ruhttps://orcid.org/0000-0002-1803-5928ИвановО. Н.IvanovO. N.

Иванов Олег Николаевич, доктор физ.- мат. наук, профессор кафедры «Материаловедения и нанотехнологий»

308015, г. Белгород, ул. Победы, 85 

Ivanov Oleg Nikolaevich, Doctor of Science in Physics and Mathematics, Professor at the Department of Materials Science and Nanotechnology

308015, Belgorod, Pobedy street, 85

Белгородский государственный национальный исследовательский университет, НИУ «БелГУ»РоссияBelgorod State National Research University, NRU BELSURussian Federation202512012026095774Copyright © Международный издательский дом научной периодики "Спейс, 20262026Международный издательский дом научной периодики "СпейсМеждународный издательский дом научной периодики "Спейсhttps://www.isjaee.com/jour/about/submissions#copyrightNoticehttps://www.isjaee.com/jour/article/view/2715

В настоящей работе представлена результаты исследования термоэлектрических свойств (удельное электрическое сопротивление, коэффициент Зеебека, полная теплопроводность) композита, в качестве матрицы которого использован низкотемпературный термоэлектрик p-типа Bi0,5Sb1,5Te3, а в качестве наполнителя – включения полупроводника дителлурида никеля (NiTe2). Исследованные композиты были получены с использованием методов сольвотермального синтеза наполнителя NiTe2, и механохимической активации с последующим электроимпульсным спеканием матрицы Bi0,5Sb1,5Te3 и самих композитов. Установлено, что введение 1 масс. % NiTe2 в матрицу композита приводит к значительному улучшению термоэлектрической добротности ZT до 1,1 при 425 К, что на 16% выше по сравнению с материалом самой матрицы (ZT ~ 0,95). Это повышение может быть связано с эффективным рассеянием фононов на границах раздела NiTe2/Bi0,5Sb1,5Te3, что приводит к снижению полной теплопроводности, при этом фактор мощности (S2/ρ) остается достаточно высоким. Дальнейшее увеличение содержания NiTe2 до 2,5 и 5 масс. % приводит к деградации ZT в композитах, что может быть обусловлено такими особенностями их микроструктуры, как образование вторичной фазы элементного теллура, которые формируют «тепловые мостики», увеличивая тем самым теплопроводность и незначительно ухудшая электронные транспортные свойства.

This paper presents the results of a study on the thermoelectric properties (electrical resistivity, Seebeck coefficient, and total thermal conductivity) of a composite with a p-type low-temperature thermoelectric Bi0,5Sb1,5Te3 matrix and inclusions of the semiconductor nickel ditelluride (NiTe2) as a filler. The studied composites were fabricated using solvothermal synthesis for the NiTe2 filler, and mechanochemical activation followed by spark plasma sintering for the Bi 0,5Sb1,5Te3 matrix and the composites themselves. It has been established that the introduction of 1 wt.% of NiTe2 into the composite matrix leads to a significant enhancement of the thermoelectric figure of merit (ZT) to 1,1 at 425 K, which is 16% higher compared to the matrix material itself (ZT ~ 0,95). This enhancement can be attributed to the effective phonon scattering at the NiTe2/Bi0,5Sb1,5Te3 interfaces, which leads to a reduction in the total thermal conductivity, while the power factor (S2/ρ) remains sufficiently high. A further increase in NiTe2 content to 2,5 and 5 wt.% leads to a degradation of ZT in the composites, which may be due to microstructural features such as the formation of a secondary phase of elemental tellurium. This phase forms «thermal bridges», thereby increasing thermal conductivity and slightly deteriorating the electronic transport properties.

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The authors declare that there are no conflicts of interest present.