Фаза пирохлора в системе Bi₂O₃‒Fe₂O₃‒WO₃‒(H₂O): формирование в условиях гидротермального синтеза в низкотемпературной области фазовой диаграммы

В работе исследованы особенности формирования фазы со структурой кубического пирохлора (Bi, Fe, ¨)₂(Fe, W)₂O₆O¢_δ (далее ‒ BFWO) в системе Bi₂O₃‒Fe₂O₃‒WO₃‒(H₂O) в условиях гидротермального синтеза при T < 200 ℃ и в области значений pH < 1. Установлено, что фаза BFWO формируется даже в том случае, когда температура обработки суспензии аморфного прекурсора составляет менее 100 ℃. Частицы фазы BFWO имеют условно сферическую морфологию и являются поликристаллическими. Зависимость среднего размера частиц фазы BFWO от температуры хорошо коррелирует с зависимостью от этого параметра среднего размера кристаллитов ‒ обе величины скачкообразно увеличиваются при повышении температуры обработки суспензии аморфного прекурсора от 90 до 110 ℃ (от ~ 140 и 70 нм до ~ 180 и 90 нм соответственно), а при дальнейшем повышении температуры гидротермальной обработки до 190 ℃ возрастают уже более плавно (до ~ 210 и 110 нм соответственно). Показано, что среднее число кристаллитов в частице составляет ~ 9 ед. в независимости от температуры синтеза, т.е. увеличение размеров частиц фазы BFWO при повышении температуры (в рассмотренном температурном диапазоне) происходит преимущественно за счёт увеличения размеров составляющих их кристаллитов.

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