Формирование наночастиц NH4MgF3 и MgF2 из гидроксикарбоната магния в расплаве гидрофторида аммония

Фторметаллаты аммония со структурой перовскита NH₄MF₃ (M = 3d металлы) используются в качестве катодных материалов, а NH₄MgF₃ — в качестве твердых электролитов. В литературе имеется лишь фрагментарная информация о получении порошка NH₄MgF₃ и отсутствуют данные рентгеновской дифракции. Предложены условия, позволяющие синтезировать однофазный порошок NH₄MgF₃ путем взаимодействия гидроксикарбоната магния с расплавом гидрофторида аммония при температуре 220 °C. Было установлено, что процесс является двухэтапным: первая реакция представляет собой образование соединения (NH₄)₂MgF₄, а вторая реакция представляет собой разложение (NH₄)₂MgF₄ при температуре 220 °C до NH₄MgF₃. При разложении NH₄MgF₃ образуются безводные наночастицы MgF₂ (28 ± 7 нм). Предлагаемый способ получения однофазного NH₄MgF₃ открывает возможности для изучения его функциональных свойств.

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