vestichИзвестия Национальной академии наук Беларуси. Серия химических наукProceedings of the National Academy of Sciences of Belarus, Chemical Series1561-83312524-2342The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"vestich-236Research ArticleНЕОРГАНИЧЕСКАЯ ХИМИЯINORGANIC CHEMISTRYВЛИЯНИЕ МЕТОД А СПЕКАНИЯ НА МИКРОСТРУКТУРУ КЕРА МИКИ ND0,4SR1,6NIOEFECT OF SINTERING METHOD ON MICROSTRUCTURE OF ND0.4SR1.6NIO4–D CERAMICSКравченкоЕ. С.KravchenkoE. S.

магистр хим. наук, аспирант

M.Sc. degree, Ph.D. student Department of Chemistry

che.kravchenko@gmail.comЯремченкоА. А.YaremchenkoA. A.

канд. хим. наук, гл. науч. сотрудник

D. degree, Principal Researcher.

ayaremchenko@ua.ptГринсЕ.GrinsJ.

канд. хим. наук, науч. сотрудник.

Ph.D. degree, Researcher.

jekabs.grins@mmk.su.seСвенссонГ.SvenssonG.

д-р хим. наук, профессор, декан.

Ph.D. degree, Professor, Head of the Department

gunnar.svensson@mmk.su.seБелорусский государственный университет, СИСЕКО – Авейровский институт материалов, Факультет материаловедения и керамики, Стокгольмский университет, Факультет материалов и химии окружающей средыBelarusian State University, CICECO – Aveiro Institute of Materials, University of Aveiro, Stockholm UniversityСИСЕКО – Авейровский институт материалов, Факультет материаловедения и керамикиCICECO – Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of AveiroСтокгольмский университет, Факультет материалов и химии окружающей средыDepartment of Materials and Environmental Chemistry, Stockholm University201706032017013743Copyright © Кравченко Е.С., Яремченко А.А., Гринс Е., Свенссон Г., 20172017Кравченко Е.С., Яремченко А.А., Гринс Е., Свенссон Г.Kravchenko E.S., Yaremchenko A.A., Grins J., Svensson G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestichem.belnauka.by/jour/article/view/236

Исследовано влияние методов свободного спекания и плазменного искрового спекания (ПИС) на микроструктуру керамики Nd0,4Sr1,6NiO4–d. Установлено, что керамика, изготовленная свободным спеканием, является пористой независимо от температуры отжига. Керамика, полученная методом плазменного искрового спекания, – газоплот-ная. однако в результате применения восстановительной атмосферы вакуума в процессе ПИС происходит структурное превращение тетрагональной ячейки I4/mmm в орторомбическую Immm. В результате проведенной серии термообработок керамики были найдены оптимальные условия последующего отжига керамики, приводящие к восстановлению тетрагональной структуры оксида (Immm→I/4mmm) и сохранению газоплотности керамики Nd0,4Sr1,6NiO4–d.

Two different methods have been employed for fabrication of Nd0.4Sr1.6NiO4–d ceramics with focus on the microstructure and density of ceramic samples. Conventional sintering at 1100–1300 °C has been found to yield porous materials. Rapid grain growth at ≥1 300 °C induces the development of microcracks associated with a strongly anisotropic expansion ofNd0.4Sr1.6NiO4–d tetragonal lattice. On the contrary, spark plasma sintering (SPS) at 1100 °C enables fabrication of dense gastight ceramics, but is accompanied by the structural transformation from tetragonal (I4/mmm) to orthorhombic (Immm) symmetry due to oxygen losses from the lattice under low-p(O2) conditions of SPS process. The post-treatment conditions were optimized to oxidize sintered samples and to restore tetragonal structure while preserving gas-tightness of ceramics.

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