najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2024-15-2-240-254najo-56Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХPyrochlore phase in the Bi2O3‒Fe2O3‒WO3‒(H2O) system: its stability field in the low-temperature region of the phase diagram and thermal stabilityФаза пирохлора в системе Bi2O3‒Fe2O3‒WO3‒(H2O): поле устойчивости в низкотемпературной области фазовой диаграммы и термическая устойчивостьhttps://orcid.org/0000-0001-5455-4541ЛомакинМ. С.LomakinM. S.

Makariy S. Lomakin.

26, Politekhnicheskaya St., 194021, St. Petersburg; 5, Professor Popov St., 197376, St. Petersburg

lomakinmakariy@gmail.comhttps://orcid.org/0000-0002-2807-375XПроскуринаО. В.ProskurinaO. V.

Olga V. Proskurina.

26, Politekhnicheskaya St., 194021, St. Petersburg; 26, Moskovsky Ave., 190013, St. Petersburg

proskurinaov@mail.ruhttps://orcid.org/0000-0001-9258-3204ЛевинА. А.LevinA. A.

Aleksandr A. Levin.

26, Politekhnicheskaya St., 194021, St. Petersburg

aleksandr.a.levin@mail.ioffe.ruhttps://orcid.org/0000-0002-7661-9155НеведомскийВ. Н.NevedomskiyV. N.

Vladimir N. Nevedomskiy.

26, Politekhnicheskaya St., 194021, St. Petersburg

nevedom@mail.ioffe.ruIoffe Institute; St. Petersburg Electrotechnical University “LETI”Russian FederationIoffe Institute; St. Petersburg State Institute of TechnologyRussian FederationIoffe InstituteRussian Federation202431052025152240254Copyright © Lomakin M.S., Proskurina O.V., Levin A.A., Nevedomskiy V.N., 20252025Ломакин М.С., Проскурина О.В., Левин А.А., Неведомский В.Н.Lomakin M.S., Proskurina O.V., Levin A.A., Nevedomskiy V.N.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/56

The concentration stability field localization of the pyrochlore-structured compounds of variable composition formed in the Bi2O3–Fe2O3–WO3 system under hydrothermal conditions at a temperature of T = 200◦C and a pressure of P = 7 MPa was determined. It was found that the pyrochlore-structured compounds stability field is longitudinally limited within the atomic ratios 0.47 < Bi/W < 1.25, and in the transverse direction within 1.14 < Bi/Fe < 1.87. It was shown that the pyrochlore phase cubic unit cell parameter a depends on the compound chemical composition as follows: it increases linearly from ∼ 10.3319 A˚ to ∼ 10.4199 A˚ with an increase in the Bi/W atomic ratio from ∼ 0.47 to ∼ 1.25. It was established that from the Bi2O3–WO3 system side, there is a region of two-phase equilibrium, in which a pyrochlore phase of variable composition coexists with the Bi2WO6 compound, which is formed in the form of plate-like (thickness h ∼ 50–100 nm) nanoparticles. It was shown that from the Bi2O3–Fe2O3 system side, there is a region of compositions, in which the pyrochlore phase of the most enriched in bismuth oxide composition coexists with the Bi2WO6 compound, which is formed in the form of rod-shaped (h ∼ 10–30 nm) nanoparticles, and with the X-ray amorphous phase composition, formed in the form of nanocrystalline particles about 10 nm in size. It was found that the higher temperature point of the pyrochlore-structured compounds stability field does not exceed 725◦C, which allows them to be synthesized only by “soft chemistry” methods.

Определено положение концентрационной области устойчивости соединений переменного состава со структурой пирохлора, формирующихся в системе Bi2O3-Fe2O3-WO3 в гидротермальных условиях при температуре T = 200 °C и давлении P = 7 МПа. Установлено, что область устойчивости фазы пирохлора в продольном направлении ограничена в пределах атомных соотношений 0.47 < Bi/W < 1.25, а в поперечном направлении в пределах 1.14 < Bi/Fe < 1.87. Показано, что параметр a кубической элементарной ячейки фазы пирохлора зависит от химического состава соединения следующим образом: линейно возрастает от ~ 10.3319 Å до ~ 10.4199 Å с увеличением атомного соотношения Bi/W от ~ 0.47 до ~ 1.25. Установлено, что со стороны системы Bi2O3-WO3 имеется область двухфазного равновесия, в которой фаза пирохлора переменного состава сосуществует с соединением Bi2WO6, формирующемся в виде пластинчатых (толщиной h ~ 50‒100 нм) наночастиц. Показано, что со стороны системы Bi2O3-Fe2O3 имеется область составов, в которой фаза пирохлора наиболее обогащённого по оксиду висмута состава сосуществует с соединением Bi2WO6, формирующемся в виде стержневидных (h ~ 10‒30 нм) наночастиц, и с рентгеноаморфной фазой, формирующейся в виде нанокристаллических частиц размером около 10 нм. Показано, что верхний температурный предел области устойчивости полученных соединений со структурой пирохлора не превышает 725 °C, что позволяет синтезировать их только методами «мягкой химии».

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