ФАЗОВІ РІВНОВАГИ ТА КРИСТАЛІЧНА СТРУКТУРА СПОЛУК
СИСТЕМИ Tb–B–C ПРИ 1 270 K

V. Babizhetskyy, V. Levytskyy

Анотація


Методами рентгенофазового і рентгеноструктурного аналізів енергодисперсійної та рентгенівської спектроскопії за довжиною хвилі (WDXS) побудовано ізотермічний переріз діаграми стану системи Tb–B–C при 1 270 K. Підтверджено існування восьми тернарних сполук. Визначено склади нових сполук ~Tb2BC3, ~Tb4B5C18 та область гомогенності фази Tb5(B,C)x, що належить до структурного типу La5B2C6 й описано формулою Tb5(B,C)x, 8,3£ x £9,2: a = 8,102(1), c = 11,568(2) Å (для Tb5B2,1C6,2) та a = 8,054(1), c = 12,335(4) Å (для Tb5B2,9C5,3). Кристалічну структуру сполуки TbB2C2 вперше уточнено рентгенівським методом монокристала: СТ DyB2C2, ПГ P4/mbm, Z = 2, a = 5,337(1), c = 3,575(1) Å, R1 = 0,019 (wR2 = 0,021) для 180 рефлексів з Io > 2σ(Io).


Ключові слова: борокарбіди, потрійна система, фазові рівноваги, кристалічна структура.


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DOI: http://dx.doi.org/10.30970/vch.6001.012

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