Керамические материалы из нанокристаллического оксида InFeZnO₄: оптические и механические свойства и оценка радиационной стойкости

Разработан способ низкотемпературного синтеза оксида InFeZnO₄ из рентгеноаморфного прекурсора, образующегося в результате термического разложения продуктов дегидратации смеси поливинилового спирта и растворов нитратов железа, индия и цинка. С помощью ТГ/ДСК и РФА показано, что фаза InFeZnO₄ образуется в температурном интервале 370–420°C. Методом РФА установлено, что после термической обработки прекурсора при 800°C в течение 4 ч образуется нанокристаллический InFeZnO₄ со средним размером частиц (ОКР) ≈ 36 нм. По данным РЭМ, они не имеют четкой огранки и образуют однородную, ячеистую микроструктуру порошка. Отсутствие органических остатков и влаги в нем подтверждено методом ИК-спектроскопии. Из данных СДО найдено, что ширина запрещенной зоны Eg InFeZnO₄ для случая непрямых и прямых переходов составляет 1.54 эВ и 2.25 эВ, соответственно. Керамика, изготовленная из нанокристаллического InFeZnO4 методом высокотемпературного спекания, имеет плотность, равную 5160 кг/м³ (≈ 86% от теоретической). Ее микротвердость, измеренная по методу Виккерса, равна 2.12 ГПа.  Спрогнозирована радиационная стойкость InFeZnO₄. Из результатов прогноза следует, что при воздействии на материал средних и высоких доз ионизирующего излучения наиболее вероятна его частичная аморфизация.

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