Влияние условий спекания нанокристаллов La_0.9Y_0.1PO₄ со структурой монацита на термические и механические свойства материала

Синтезирован нанокристаллический материал на основе ортофосфатов лантана и иттрия La_0.9Y_0.1PO₄ со структурой монацита. Определено влияние температуры обработки на его термические и механические свойства. Показано, что при гидротермальной обработке соосажденных фосфатов при 230 °С в течение 110 минут образуются наночастицы со структурой монацита с размером кристаллитов около 16 нм. Термическая обработка нанопорошков в течение 20 мин в режиме отжиг-закалка при 1000–1400 °С привела к получению компактных материалов, пористость которых варьировалась от 52 до 27 % при росте зерен от ~20 до ~100 нм. Активное спекание происходило при температурах выше 1300 °С. Нанокристаллические материалы, полученные термообработкой при 1200 °С с размером зерна ~40 нм, имеют пористость 42 %, микротвердость Hv(25°С) = 4±0.5 ГПа, теплопроводность λ(25°С) = 0.4·м^-1·К^-1, и может использоваться в качестве теплоизоляционного материала.

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