Диэлектрическая релаксация и протонная проводимость полисурьмяной кислоты, допированной ионами ванадия

Аннотация

Методом импедансной спектроскопии исследованы протонпроводящие свойства полисурьмяной кислоты (ПСК), допированной ионами ванадия. Для твердых растворов состава H2Sb2–xVxO6·nH2O, кристаллизующихся в структурном типе пирохлора (пр. гр. симм. Fd3m), показано, что увеличение количества ванадия в образце приводит к росту удельной протонной проводимости, которая для крайнего твердого раствора замещения H2Sb1.52V0.48O6·nH2O составляет 66 мСм/м. Из анализа данных диэлектрической спектроскопии при температурах 218–298 К определена энергия активации проводимости, которая составила 30±2 КДж/моль. Предложен механизм протонного транспорта,         согласно которому в допированных ионами ванадия ПСК проводимость осуществляется по
системе водородных связей, образованных молекулами воды, расположенными в гексагональных каналах структуры типа пирохлора, и анионами кислорода октаэдра, формирующего каркас структуры

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