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-215Research ArticleФИЗИЧЕСКАЯ ХИМИЯPHYSICAL CHEMISTRYТЕРМИЧЕСКОЕ РАСШИРЕНИЕ, ЭЛЕКТРИЧЕСКАЯ ПРОВОДИМОСТЬ И КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ НИКЕЛАТОВ La2-xSrxNiO4-δ КАК ПОТЕНЦИАЛЬНЫХ КАТОДНЫХ МАТЕРИАЛОВ TОТЭTHERMAL EXPANSION, ELECTRICAL CONDUCTIVITY AND OXYGEN NONSTOICHIOMETRY OF La2-xSrxNiO4-δ NICKELATES AS PROSPECTIVE SOFC CATHODE MATERIALSКравченкоЕ. С.KravchenkoE. S.

магистр хим. наук, аспирант хим. фак.

M. Sc. (Chemistry), student.

che.kravchenko@gmail.comЗахарчукК. В.ZakharchukK. V.

науч. сотрудник

Research Fellow.

k.zakharchuk@ua.ptЯремченкоА. А.YaremchenkoA. A.

канд. хим. наук, гл. науч. сотрудник

Ph. D. (Chemistry), Principal Researcher

ayaremchenko@ua.ptГринсЕ.GrinsJ.

канд. хим. наук, науч. сотрудник

Ph. D. (Chemistry), Researcher.

jekabs.grins@mmk.su.seСвенссонГ.Stockholm University,G.

д-р хим. наук, проф., декан

D. Sc. (Chemistry), Professor, Head of the Department.

gunnar.svensson@mmk.su.seПаньковВ. В.PankovV. V.

д-р хим. наук, проф., зав. кафедрой «Физическая химия».

D. Sc. (Chemistry), Professor, Head of Departament "Physical Chemistry"

pankov@bsu.byПетроваЕ. Г.PetrovaE. V.

магистр хим. наук, аспирант хим. фак.

M. Sc. (Chemistry), student.

pelena89@yandex.ruБелорусский государственный университет, СИСЕКО – Авейровский институт материалов,Стокгольмский университетBelarusian State UniversityСИСЕКО – Авейровский институт материаловCICECO – Aveiro Institute of MaterialsСтокгольмский университетStockholm UniversityБелорусский государственный университетBelarusian State University20161701201704715Copyright © Кравченко Е.С., Захарчук К.В., Яремченко А.А., Гринс Е., Свенссон Г., Паньков В.В., Петрова Е.Г., 20172017Кравченко Е.С., Захарчук К.В., Яремченко А.А., Гринс Е., Свенссон Г., Паньков В.В., Петрова Е.Г.Kravchenko E.S., Zakharchuk K.V., Yaremchenko A.A., Grins J., Stockholm University, G., Pankov V.V., Petrova E.V.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/215

Оксиды системы La2-xSrxNiO4-δ (x = 1,0–1,6) были исследованы в качестве  потенциальных катодных материалов для твердооксидных топливных элементов. Были изучены структурная стабильность, кислородная нестехиометрия и электрическая  проводимость. Установлено, что все оксиды сохраняют кристаллическую структуру типа K2NiF4 в окислительных условиях в температурной области 25–900 °С. Оксиды данной системы являются дефицитными по кислороду при температурах выше 500 °С, и  кислородная нестехиометрия повышается с ростом температуры и увеличением содержания стронция. Исследованные никелаты обладают псевдометаллической электропроводностью p-типа в окислительных условиях при температурах 500–1000 °С. Наибольшая электрическая проводимость характерна для La0,8Sr1,2NiO4-δ (220 См/см при 900 °С и 440 См/см при 600 °С). Методом высокотемпературной рентгеновской дифракции установлено, что никелаты La2-xSrxNiO4-δ проявляют анизотропное термическое расширение кристаллической решетки, однако объемное термическое расширение носит практически линейную зависимость от температуры; значения линейных коэффициентов термического расширения составляют (14,2–15,6) · 10-6 K-1.

La2-xSrxNiO4-δ (x = 1.0–1.6) nickelates were evaluated as potential cathode materials for solid oxide fuel cells, with focus on the structural stability, oxygen nonstoichiometry and electrical conductivity under oxidizing conditions. All studied ceramic materials were found to preserve K2NiF4-type tetragonal structure under oxidizing conditions at 25–900  °С.La2-xSrxNiO4-δ (x = 1.0–1.6) nickelates demonstrate oxygen deficiency at temperatures above 500 °С, with oxygen nonstoichiometry increasing with temperature and strontium content. The electrical conductivity is p-type and show metallic-like behavior under oxidizing conditions at 500–1000 °С. The highest conductivity values, 220 S/cm at 900 °С and 440  S/cm at 600 °С in air, are measured for La0,8Sr1,2NiO4-δ ceramics. While the high-temperature XRD studies revealed strongly anisotropic thermal expansion of La2-xSrxNiO4-δ crystal lattice, the lattice volume show nearly linear dependence on temperature, with average linear thermal expansion coefficients varying in the range (14.2–15.6) · 10-6 K-1.

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