nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2023-3-33-39nuc-527Research ArticleСтатьиИЗУЧЕНИЕ ВЛИЯНИЯ ДОПИРОВАНИЯ MgO НА ТЕПЛОФИЗИЧЕСКИЕ СВОЙСТВА КЕРАМИК НА ОСНОВЕ МЕТАЦИРКОНАТА ЛИТИЯSTUDY OF THE INFLUENCE OF MgO DOPING ON THE THERMOPHYSICAL PROPERTIES OF CERAMICS BASED ON LITHIUM METAZIRCONATEhttps://orcid.org/0000-0003-2454-7177ШлимасД. И.ShlimasD. I.

Дмитрий Шлимас

Алматы

Astana, 010008

shlimas@mail.ruХаметоваА.KhametovaA.

Айнагуль Хаметова

Алматы

Astana, 010008

khametovaaa@gmail.comhttps://orcid.org/0000-0001-8832-7443КозловскийА. Л.KozlovskiyA. L.

Артем Леонидович Козловский

Алматы

Astana, 010008

artem88sddt@mail.ruНАО Евразийский национальный университет им. Л.Н. Гумилева; Институт ядерной физики МЭ РККазахстанL.N. Gumilyov Eurasian National University; Institute of Nuclear Physics ME RKKazakhstanНАО Евразийский национальный университет им. Л.Н. ГумилеваКазахстанL.N. Gumilyov Eurasian National UniversityKazakhstan202330092023033339Copyright © Шлимас Д.И., Хаметова А., Козловский А.Л., 20232023Шлимас Д.И., Хаметова А., Козловский А.Л.Shlimas D.I., Khametova A., Kozlovskiy A.L.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/527

В работе представлены результаты изучения влияния допирования оксидом магния (MgO) литийсодержащих керамик на основе метацирконата лития (Li2ZrO3) на изменение теплофизических параметров керамик. В качестве основного метода для получения керамик, а также осуществления процессов допирования MgO был выбран метод механохимического синтеза с последующим высокотемпературным отжигом при температуре 1300 °С, используемым для инициализации процессов фазовых трансформаций структурного упорядочения. В ходе проведенного рентгенофазового анализа было установлено, что увеличение концентрации допанта MgO выше 0,10 моль приводит к формированию в структуре керамик примесных включений в виде тетрагональной фазы MgLi2ZrO4, содержание которой увеличивается при изменении концентрации допанта. В случае концентрации допанта 0,25 моль фазовый состав керамик представляет собой равновероятное распределение двух фаз – моноклинной Li2ZrO3 и тетрагональной MgLi2ZrO4. В ходе измерения теплофизических параметров было установлено, что формирование фазы MgLi2ZrO4 в составе керамик приводит к увеличению коэффициента теплопроводности на 5–10%, а в случае равновероятного распределения фаз в двухфазных MgLi2ZrO4 – Li2ZrO3 керамиках увеличение теплопроводности составляет более 25% в сравнении с недопированными керамиками. Увеличение эффективности теплопроводящих свойств для двухфазных керамик обусловлено увеличением скорости фононной передачи тепла за счет дополнительных межфазных границ, а также увеличения степени структурного упорядочения и плотности керамик.

The paper presents the results of studying the effect of doping with magnesium oxide (MgO) of lithium-containing ceramics based on lithium metazirconate (Li2ZrO3) on the change in the thermophysical parameters of ceramics. The method of mechanochemical synthesis followed by high-temperature annealing at a temperature of 1300 °C, used to initiate the processes of phase transformations from structural ordering, was chosen as the main method for obtaining ceramics, as well as for performing MgO doping processes. In the course of the studies, it was found that an increase in the concentration of the MgO dopant above 0.10 mol leads to the formation of impurity inclusions in the structure of ceramics in the form of a tetragonal phase MgLi2ZrO4, the content of which increases with an increase in the concentration of the dopant. In the case of a dopant concentration of 0.25 mol, the phase composition of ceramics is an equiprobable distribution of two phases, monoclinic Li2ZrO3 and tetragonal MgLi2ZrO4. In the course of measuring thermophysical parameters, it was found that the formation of the MgLi2ZrO4 phase in the composition of ceramics leads to an increase in the thermal conductivity by 5–10%, and in the case of an equiprobable distribution of phases in two-phase MgLi2ZrO4– Li2ZrO3 ceramics, the increase in thermal conductivity is more than 25% in comparison with undoped ceramics. An increase in the efficiency of heat-conducting properties for two-phase ceramics is due to an increase in the rate of phonon heat transfer due to additional interfacial boundaries, as well as an increase in the degree of structural ordering and density of ceramics.

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