najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2022-13-6-662-667najo-281Research ArticleСтатьиThermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6Термическая устойчивость нанокристаллического BiAl3(PO4)2(OH)6 со структурой вейлендитаhttps://orcid.org/0000-0003-4345-6086ЕловиковД. П.ElovikovD. P.syncdima@mail.ruhttps://orcid.org/0000-0002-2807-375XПроскуринаО. В.ProskurinaO. V.proskurinaov@mail.ruhttps://orcid.org/0000-0002-1537-4107ТомковичМ. В.TomkovichM. V.maria.tom83@gmail.comhttps://orcid.org/0000-0003-2895-0625УголковВ. Л.UgolkovV. L.ugolkov.52@gmail.comhttps://orcid.org/0000-0003-4375-6388ГусаровВ. В.GusarovV. V.victor.v.gusarov@gmail.comФизико-технический институт имени А. Ф. Иоффе РАН; Санкт-Петербургский государственный электротехнический университет "ЛЭТИ" им. В.И.УльяноваIoffe Institute; St. Petersburg Electrotechnical University “LETI”Физико-технический институт имени А. Ф. Иоффе РАН; Санкт-Петербургский государственный технологический институтIoffe Institute; St. Petersburg State Institute of TechnologyФизико-технический институт имени А. Ф. Иоффе РАНIoffe InstituteИнститут химии силикатов имени И.В.ГребенщиковаI. V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences202206062025136662667Copyright © Elovikov D.P., Proskurina O.V., Tomkovich M.V., Ugolkov V.L., Gusarov V.V., 20252025Еловиков Д.П., Проскурина О.В., Томкович М.В., Уголков В.Л., Гусаров В.В.Elovikov D.P., Proskurina O.V., Tomkovich M.V., Ugolkov V.L., Gusarov V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/281

A nanocrystalline powder of the waylandite-structured bismuth hydroaluminophosphate was obtained under hydrothermal conditions at 200 °C, 7 MPa and pH 7, and characterized by X-ray diffractometry, scanning electron microscopy (SEM), and energy dispersive microanalysis (EDAX). The simultaneous thermal analysis and high-temperature X-ray diffractometry have shown that the crystal-chemical formula of this compound can be represented as BiAl3(PO4)2O(OH)4·(H2O). This compound retains its structure and crystallite size ( 65 nm) up to about 500 °C. It has been determined that the decomposition of this compound in the 540-800 °C range results in the formation of Bi2O3, Bi2Al4O9 and AlPO4 phases. At temperatures above 800 °C, a complete thermal decomposition of Bi2Al4O9 and the formation of crystalline α-Al2O3 occur in this system, while Bi2O3 keeps evaporating during the isothermal exposure.

В гидротермальных условиях при температуре 200 °С, давлении 7 МПа и величине pH 7 получен нанокристаллический порошок гидроалюмофосфата висмута со структурой вейлендита, охарактеризованный методами рентгеновской дифрактометрии, сканирующей электронной микроскопии (SEM) и энергодисперсионного микроанализа (EDAX). С использованием методов синхронного термического анализа и высокотемпературной рентгеновской дифрактометрии установлено, что кристаллохимическая формула данного соединения может быть представлена в виде BiAl3(PO4)2O(OH)4·(H2O). Данное соединение сохраняет свою структуру и размеры кристаллитов (~65 нм) до температуры около 500 °С. Определено, что после разложения этого соединения в температурном диапазоне 540-800 °С формируются фазы состава Bi2O3, Bi2Al4O9 и AlPO4. При температуре выше 800 °С в данной системе происходит полное термическое разложение Bi2Al4O9 с образованием кристаллического α-Al2O3, а Bi2O3 испаряется по мере продолжительности изотермической выдержки.

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