Синтез и магнитные свойства наночастиц феррита кобальта, сформированных в гидро- и сольвотермических условиях

Наночастицы феррита кобальта синтезированы как в гидро-, так и в сольвотермальнойх условиях из солей Co и Fe различной химической природы (нитраты и хлориды), взятых в соотношении катионов 1:2. Варьирование химической предыстории, температуры синтеза, времени изотермической выдержки и состава реакционной среды позволило получить набор наночастиц Co_xFe_3-xO₄ с различным средним диаметром и степенью изоморфного замещения x. Элементный состав, кристаллическую структуру, размеры и магнитные свойства полученных наночастиц определяли с помощью EDX-анализа, рентгеноструктурного анализа, просвечивающей электронной микроскопии и СКВИД-магнитометрии. Рассмотрены температурные зависимости коэрцитивной силы, остаточной намагниченности, прямоугольности как от среднего диаметра, так и от стехиометрии наночастиц. Нанокристаллы Co_xFe_3-xO₄ размером от 11 до 29 нм представляли собой одиночные магнитные домены и проявляли ферримагнитное поведение при комнатной температуре. Магнитожесткие наночастицы с максимальной величиной соотношения Mr/Ms в высокотемпературной области были получены для x = 0.79 при сольвотермальной обработке нитратов кобальта и железа при 250 °С, 7 МПа в течение 10 часов.

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