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0416U000630,
к.х.н.
02-03-2016
o
Synthesis, crystal structure and magnetic properties of germanides and antimonides of iron/nickel with alkaline-earth and rare-earth metals
Gvozdetskyi Volodymyr Yaroslavovych,
popup.head Gladyshevskii Roman Yevhenovych
popup.opponent Неділько Сергій Андрійович
popup.opponent Парасюк Олег Васильович
Вперше встановлено вплив Ba на структуру та властивості твердого розчину Sr1-xBaxNi2Ge2 (концентраційний та температурний перехід від тетрагональної до ромбічної структури через модульовану), визначено область існування дефектного антимоніду SrNi2-xSb2, синтезовано низку нових твердих розчинів із структурами типів CeAl2Ga2, Y0,5Co3Ge3, BaNiSn3 та CeMn4Al8, встановлено окремі фазові рівноваги у чотирикомпонентних системах {Ce,Gd,Yb}-Fe-Ge-Sb в області вмісту рідкісноземельного металу ? 33,3 ат.% при 773 K та досліджено магнітні властивості окремих зразків. Виявлено діамагнітний сигнал при 60 K для суміші фаз типів 122 та 113 системи La-Sr-Co-Ge. Розглянуто кристалохімічні особливості родини структурних типів із многогранниками Франка-Каспера та виявлено, що із різних гіпотетичних структур лише одна комбінація із правила Ярмолюка-Крип'якевича реалізується для даного числа ікосаедрів, а також, числа базових фрагментів структур родини утворюють серію, де кожен наступний представник рівний сумі двох попередніх, відому як послідовність Фібоначчі.
2016-03-02
2020-04-03
Updated: 2025-12-08
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