vestiftИзвестия Национальной академии наук Беларуси. Серия физико-технических наукProceedings of the National Academy of Sciences of Belarus. Physical-technical series1561-83582524-244XThe Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8358-2025-70-3-209-218vestift-906Research ArticleСтатьиПрименение атомно-силовой микроскопии для исследования строения и электрических свойств кристаллов гидросульфатфосфатов цезияApplication of atomic force microscopy to study the structure and electrical properties of cesium hydrosulfate phosphate crystalshttps://orcid.org/0000-0002-5387-8613ТолстихинаА. Л.TolstikhinaA. L.

Толстихина Алла Леонидовна – доктор физико-математических наук, главный научный сотрудник

Ленинский пр., 59, 117333, Москва

Alla L. Tolstikhina – Dr. Sci. (Physics and Mathematics), Chief Researcher 

59, Leninsky Ave., 119333, Moscow

alla@crys.ras.ruhttps://orcid.org/0000-0002-5384-4026ГайнутдиновР. В.GainutdinovR. V.

Гайнутдинов Радмир Вильевич – кандидат физико-математических наук, ведущий научный сотрудник 

Ленинский пр., 59, 117333, Москва

Radmir V. Gainutdinov – Cand. Sci. (Physics and Mathe matics), Leading Researcher 

59, Leninsky Ave., 119333, Moscow

radmir@crys.ras.ruМакароваИ. П.MakarovaI. P.

Макарова Ирина Павловна – доктор физико-математических наук, ведущий научный сотрудник 

Ленинский пр., 59, 117333, Москва

Irina P. Makarova  – Dr. Sci. (Physics and Mathematics), Leading Researcher

59, Leninsky Ave., 119333, Moscow

makarova@crys.ras.ruИнститут кристаллографии имени А. В. Шубникова Курчатовского комплекса кристаллографии и фотоники НИЦ «Курчатовский институт»Shubnikov Institute of Crystallography of Kurchatov Complex “Crystallography and Photonics” of NRC “Kurchatov Institute”202514102025703209218Copyright © Толстихина А.Л., Гайнутдинов Р.В., Макарова И.П., 20252025Толстихина А.Л., Гайнутдинов Р.В., Макарова И.П.Tolstikhina A.L., Gainutdinov R.V., Makarova I.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestift.belnauka.by/jour/article/view/906

Приведены результаты комплексного исследования (с применением методов атомно-силовой микроскопии  и  структурного  анализа)  водородсодержащих  кристаллов  гидросульфатфосфатов  цезия  Cs3(HSO4)2(H2PO4) и Cs4(HSO4)3(H2PO4). Рассматриваются применения контактных и бесконтактных методик атомно-силовой микроскопии для изучения морфологии поверхности и локальных электрических характеристик кристаллов. В результате сопоставления итогов исследований электропроводности и структуры обнаружено увеличение проводимости, связанное с образованием суперпротонных фаз и изменением системы водородных связей. Полученная информация о реальной и атомной структуре, проводимости и фазовых превращениях кристаллов-суперпротоников имеет принципиальное значение для поиска и создания новых функциональных материалов для энергоэффективных технологий. 

Cs3(HSO4)2(H2PO4) and Cs4(HSO4)3(H2PO4) crystals are being studied in connection with the prospects of their use as materials for electrochemical devices, including fuel cells, providing direct conversion of chemical energy into electrical energy in the temperature range of 300–500 K. The paper demonstrates the capabilities of atomic force microscopy (AFM) for the diagnosis of two similar in composition isostructural compounds with superprotonic conductivity. Measurements of local current–voltage characteristic (CVC) and surface potential of crystals under atmospheric conditions with controlled parameters were performed using conductive AFM (C-AFM) and Kelvin scanning microscopy (KPFM). With an increase in temperature, an increase in conductivity was detected and the presence of a transition to the superprotonic phase was confirmed. The current value increases by 1.5–2 orders of magnitude at 413 K relative to the low-temperature state for both samples. As the phase transition temperature approaches, the continuity of the surface layers of crystals is disrupted and a defective block structure is formed. The surface is characterized by a uniform distribution of positive electrostatic potential at the micro and nanoscales and is sufficiently resistant to the effects of the surrounding air atmosphere. In interpreting the topographic and electrical features of the monoclinic phases before and after exposure to temperature, neutronography data on the atomic structure and nature of hydrogen bonds are used.

атомно-силовая микроскопиякристаллысуперпротонный фазовый переходводородные связивольт-амперная характеристикапроводимостьреальная структураatomic force microscopycrystalssuperprotonic phase transitionhydrogen bondsvolt-ampere characteristicconductivityreal structureавторы выражают благодарность В. А. Коморникову (НИЦ «Курчатовский институт») за предоставленные образцы кристаллов. Работа проведена в рамках выполнения государственного задания НИЦ «Курчатовский институт». В части атомно-силовой микроскопии работа выполнена с использованием оборудования Центра коллективного пользования «Структурная диагностика материалов» Курчатовского комплекса кристаллографии и фотоники НИЦ «Курчатовский институт» при поддержке Министерства науки и высшего образования РФ.the authors would like to thank V. A. Komornikov (NRC “Kurchatov Institute”) for the crystal samples provided. The work was carried out whithin the state assignment of NRC “Kurchatov Institute”. 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The authors declare that there are no conflicts of interest present.