ФОРМИРОВАНИЕ ДЕФЕКТОВ В АНИОННОЙ И КАТИОННОЙ ПОДРЕШЕТКЕ КРИСТАЛЛОВ MgAl₂O₄ ОБЛУЧЕННЫХ ВЫСОКОЭНЕРГЕТИЧЕСКИМИ ИОНАМИ КСЕНОНА

В работе представлены результаты исследования оптических характеристик алюмо-магниевой шпинели, облученной ионами 220 МэВ Xe, моделирующими воздействие осколков деления ядерного топлива. В ходе экспериментов измерялись спектры пропускания в инфракрасной (ИК) области (240–12500) cм⁻¹_, спектры оптического поглощения в диапазоне (2–7) эВ, Рамановские спектры измерялись по глубине проникновения иона, от поверхности до 30 мкм. В спектре оптического поглощения (2–8) эВ облученных кристаллов шпинели наблюдается широкая сложная полоса радиационно-индуцированного поглощения с пиком в районе 5,3 эВ, связанная с электронными центрами окраски типа F⁺ и F, а дырочные центры окраски ответственны за оптическое поглощение при ~ (3–4) эВ. В ближней ИК области кристалл сохраняет прозрачность. В Рамановском спектре помимо характерных для идеального кристалла Рамановских мод проявляются также дополнительные моды, A_1g* (720 см⁻¹), и E_g* (385 см⁻¹), в основном в виде ассиметричного плеча основной E_g моды. С ростом глубины отношение A_1g*/E_g увеличивается, достигая максимального значения 0,05 на 6 мкм и остается практически неизменным до конца пробега иона Xe 14 мкм, с дальнейшим уменьшением до 0,045 на глубине 30 мкм. Таким образом, при облучении ионами 220 МэВ Xe происходит катионное перемешивание вдоль ионного пути.

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