Синтез и нестехиометрия сверхпроводников HgBa2 Ca n-1 Cu nO2n+2+б (n=3,4,5) тема автореферата и диссертации по химии, 02.00.01 ВАК РФ

5 Выводы.

Найдены основные закономерности фазообразования в системе Щ-Ва-Са-Си-0 под высоким давлением. Синтезированы образцы, содержащие более 85% Щ-1234.

Впервые получены образцы Щ-1223, Нд-1234, Н§-1245 в переокисленном состоянии. Показано, что сверхпроводники ряда Н§Ва2Сап-1 Сип02п+2+б (п = 3-5) имеют одинаковый куполообразный характер зависимости Тс от содержания сверхстехиометрического кислорода (5) аналогично ранее установленным для Н§-1201 и Нд-1212.

Установлено, что присутствие углерода (в случае синтеза на воздухе) существенно влияет на фазообразование в системе Ва-Си-О. С использованием бескарбонатных прекурсоров синтезированы новые твердые растворы ВаСихОу (0.8 <х< 1.1 и 1.2 <х< 1.4).

Изучено влияние различных параметров (Т, Рнё, Рог) на синтез Н§Ва2Са2Сиз08+5 в запаянных кварцевых ампулах. Найдены оптимальные условия для синтеза образцов, содержащих до 95% Н§-1223. Установлено образование твердых растворов состава (Щ1хСих)Ва2Са2Сиз08+5, х<0.5, обладающих Тсшах =135К.

Впервые получен оксофторид на основе Н§-1223, проявляющий рекордную температуру перехода в сверхпроводящее состояние - 138К. Исследована его структура методами порошковой рентгеновской и нейтронной дифракции. Показано, что химическое модифицирование структуры, вызывающее уменьшение расстояния Си-0 без существенного изменения угла Си-О-Си в слоях (Си02), является существенным фактором, ответственным за увеличение Тс в сложных сверхпроводящих оксидах меди.

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