nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2023-3-160-167nuc-561Research ArticleСтатьиИССЛЕДОВАНИЕ ВЛИЯНИЯ ВАРИАЦИИ ФАЗОВОГО СОСТАВА НА ДИЭЛЕКТРИЧЕСКИЕ СВОЙСТВА СЕГНЕТОЭЛЕКТРИЧЕСКИХ КЕРАМИК CaTiO3 ДОПИРОВАННЫХ Y2O3STUDY OF THE INFLUENCE OF VARIATIONS IN THE PHASE COMPOSITION ON THE DIELECTRIC PROPERTIES OF FERROELECTRIC CaTiO3 CERAMICS DOPED WITH Y2O3ЖуматаеваИ. З.ZhumatayevaI. Zh.

Астана

Astana

КозловскийА. Л.KozlovskiyA. L.

Астана, Алматы

Astana

ЗдоровецМ. В.ZdorovetsM. V.

Астана, Алматы

Astana

mzdorovets@gmail.comШакирзяновР. И.ShakirzyanovR. I.

Астана

Astana

inesh.zhumatayeva@gmail.comТрухановА. В.TrukhanovA. V.

Минск

Minsk

truhanov86@mail.ruНАО Евразийский национальный университет им. Л.Н. ГумилеваКазахстанL.N. Gumilyov Eurasian National UniversityKazakhstanНАО Евразийский национальный университет им. Л.Н. Гумилева; Институт ядерной физики МЭ РККазахстанL.N. Gumilyov Eurasian National University; Institute of Nuclear Physics ME RKKazakhstanГО «НПЦ НАН Беларуси по материаловедению»БеларусьGO “SPC NAS of Belarus for Materials Science”Belarus20233009202303160167Copyright © Жуматаева И.З., Козловский А.Л., Здоровец М.В., Шакирзянов Р.И., Труханов А.В., 20232023Жуматаева И.З., Козловский А.Л., Здоровец М.В., Шакирзянов Р.И., Труханов А.В.Zhumatayeva I.Z., Kozlovskiy A.L., Zdorovets M.V., Shakirzyanov R.I., Trukhanov A.V.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/561

Изучение взаимосвязи влияния вариации фазового состава на диэлектрические характеристики сегнетоэлектрических керамик является одним из наиболее важных фундаментальных вопросов, ответ на который позволит определить потенциал применения сегнетоэлектриков в микроэлектронных приложениях и создании альтернативных источников энергии (твердооксидных топливных элементов). Целью данного исследования является изучение влияния допанта Y2O3 на процессы фазообразования и свойства синтезированных сегнетоэлектрических керамик титаната кальция, а также установление взаимосвязи влияния формирования примесных фаз на изменение диэлектрических свойств керамик. Согласно данным рентгенофазового анализа установлено, что добавление Y2O3 с концентрацией выше 0,15 моль приводит к формированию в структуре керамик орторомбической фазы CaY2O4, весовой вклад которой увеличивается при увеличении концентрации допанта. Анализ зависимости удельной электропроводности (σDC) при вариации концентрации допанта показал, что максимальное значение σDC достигается при концентрациях допанта 0,05 моль, приводящей к структурному упорядочению, обусловленному эффектом добавления оксида иттрия выступающим в качестве стабилизатора, а также формированием в структуре примесной донорной проводимости. При этом установленные зависимости изменения диэлектрических характеристик имеет хорошее согласие с изменением фазового состава, а увеличение концентрации носителей заряда, обусловленное внедрением донорной примеси в виде Y3+ приводит к возникновению объемно-зарядной поляризации в керамики.

The study of the relationship between the effect of phase composition variation on the dielectric characteristics of ferroelectric ceramics is one of the most important fundamental questions, the answer to which will allow us to determine the potential of using ferroelectrics in microelectronic applications and the creation of alternative energy sources (solid oxide fuel cells). The purpose of this study is to explore the effect of the Y2O3 dopant on the phase formation processes and the properties of the synthesized ferroelectric ceramics of calcium titanate, as well as to establish the connection between the influence of the formation of impurity phases on the change in the dielectric properties of ceramics. According to the data of X-ray phase analysis, it was found that the addition of Y2O3 with a concentration above 0.15 M leads to the formation of an orthorhombic CaY2O4 phase in the ceramic structure, the weight contribution of which increases with the dopant concentration growth. An analysis of the dependence of the specific electrical conductivity (σDC) with varying dopant concentration showed that the maximum value of σDC is achieved at dopant concentrations of 0.05 M, which leads to structural ordering due to the effect of adding yttrium oxide acting as a stabilizer, as well as the formation of impurity donor conductivity in the structure. An analysis of the dependence of the specific electrical conductivity (σDC) from dopant concentration was carried out. It has been established that the maximum value of σDC is achieved at a dopant concentration of 0.05 M. This is explained by structural ordering due to the addition of a stabilizer –  yttrium oxide, as well as the formation of impurity donor conductivity in the synthesized sample. At the same time, the established dependences of the change in dielectric characteristics are in good agreement with the change in the phase composition, and an increase in the concentration of charge carriers due to the introduction of a donor impurity in the form of Y3+ leads to the appearance of volume-charge polarization in ceramics.

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