nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2026-3-151-157nuc-1076Research ArticleСтатьиИССЛЕДОВАНИЕ СТРУКТУРНОЙ ЭВОЛЮЦИИ И УПРОЧНЕНИЯ КЕРАМИК НА ОСНОВЕ Li2TiO3, ДОПИРОВАННЫХ LiNbO3STUDY OF THE STRUCTURAL EVOLUTION AND STRENGTHENING OF Li2TiO3-BASED CERAMICS DOPED WITH LiNbO3https://orcid.org/0009-0005-9445-199XХаметоваА. А.KhametovaA. A.

Айнагуль Айтжановна Хаметова - инженер Лаборатории физики твердого тела.

Алматы

Laboratory of Solid State Physics Institute of Nuclear Physics; Laboratory of Solid State Physics L.N. Gumilyov ENU.

Almaty

khametovaaa@gmail.comhttps://orcid.org/0000-0003-2454-7177ШлимасД. И.ShlimasD. I.

Дмитрий Игорьевич Шлимас - ГНС Лаборатории физики твердого тела.

Алматы

Laboratory of Solid State Physics Institute of Nuclear Physics; Laboratory of Solid State Physics L.N. Gumilyov ENU.

Almaty

shlimas@mail.ruРГП «Институт ядерной физики» Агентства РК по атомной энергии; НАО «Евразийский национальный университет им. Л.Н. Гумилева»КазахстанInstitute of Nuclear Physics Institute of NP; L.N. Gumilyov Eurasian National UniversityKazakhstan20261610202603151157Copyright © Хаметова А.А., Шлимас Д.И., 20262026Хаметова А.А., Шлимас Д.И.Khametova A.A., Shlimas D.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://journals.nnc.kz/jour/article/view/1076

Были изучены керамические материалы на основе метатитаната лития (Li2TiO3), модифицированные ниобатом лития (LiNbO3) в диапазоне концентраций 0,05–0,25 М. Синтез проводился методом механической активации в планетарной мельнице при скоростях измельчения 150–600 об/мин с шагом 50 об/мин, с последующей термической стабилизацией при 700 °C в течение 5 часов. Целью работы было определение зависимости между концентрацией легирующей примеси, энергией механической обработки и структурно-механическими свойствами полученной керамики.

Фазовый состав и структурные параметры изучались методом рентгеновской дифракции, а морфологические особенности керамики – методом сканирующей электронной микроскопии. Как видно, образование двухфазной системы, включающей моноклинную фазу Li2TiO3 и ромбоэдрическую фазу LiNbO3, сопровождается увеличением вариации содержания легирующей примеси, одновременно с изменением параметров кристаллической решетки и уменьшением размера областей когерентного рассеяния. Анализ методом сканирующей электронной микроскопии (СЭМ) показал выраженные изменения морфологии керамики при добавлении LiNbO3 в зависимости от концентрации допанта. Увеличение скорости механической активации до 600 об/мин и увеличение концентрации легирующей добавки до 0,25 М приводит к созданию мелкозернистой композитной микроструктуры, где наблюдается улучшение прочностных характеристик по сравнению с нелегированным материалом.

Полученные данные показывают, что сочетание изменения содержания LiNbO3 и параметров механической активации является одним из наиболее эффективных инструментов контроля фаз и прочности литийсодержащих керамических материалов, что открывает огромные возможности для оптимизации в высокотемпературных энергетических приложениях.

Ceramic materials based on lithium metatitanate (Li2TiO3) modified with lithium niobate (LiNbO3) in the concentration range of 0.05–0.25 M were studied. The

Ceramic materials based on lithium metatitanate (Li2TiO3) modified with lithium niobate (LiNbO3) in the concentration range of 0.05–0.25 M were studied. The synthesis was carried out by mechanical activation in a planetary mill at grinding speeds of 150…600 rpm with a step of 50 rpm, followed by thermal stabilization at 700 °C for 5 hours. The objective of the work was to determine the relationship between the dopant concentration, the energy of mechanical processing and the structural and mechanical properties of the obtained ceramics.

The phase composition and structural parameters were studied by X-ray diffraction, and the morphological features of the ceramics were studied using scanning electron microscopy. The formation of a two-phase system, including the monoclinic Li2TiO3 phase and the rhombohedral LiNbO3 phase, can be seen. The increase in the dopant content occurs simultaneously with changes in the parameters of the crystal lattice and a decrease in the size of the coherent scattering regions. SEM analysis showed pronounced changes in the morphology of ceramics upon the addition of LiNbO3, depending on the dopant concentration. Increasing the mechanical activation rate to 600 rpm and increasing the alloying additive concentration to 0.25 M lead to the creation of a fine-grained composite microstructure, where an improvement in the strength characteristics is observed compared to the unalloyed material.

The obtained data show that the combination of changing the LiNbO3 content and mechanical activation parameters is one of the most effective tools for controlling the phases and strength of lithium-containing ceramic materials, which opens up enormous opportunities for optimization in high-temperature energy applications.

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