Вид документа : Статья из журнала Шифр издания : 54/G 96 Автор(ы) : Gusev A. I., Lipatnikov V. N. Заглавие : Ordering in the zeta-Ta4C3 – x Carbide Phase Место публикации : JETP Letters. - 2005. - Vol. 82, № 5. - С. 287-291: il. Примечания : Bibliogr. : p. 291 (14 ref.) ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): нестехиометрия--карбид тантала Аннотация: The structure of the zeta-Ta4C3 – x nonstoichiometric trigonal (rhombohedral) carbide, which is formed in the tantalum–carbon system, has been analyzed by neutron diffraction, x-ray diffraction, and metallography. The ordered distributions of carbon atoms and structure vacancies have been experimentally determined and the distribution function of carbon atoms over the nonmetallic-sublattice sites, where ordering occurs, has been calculated. The parameters of the unit cell of the zeta-Ta4C3 – x (TaC0.67) trigonal (space group ) carbide are found to be aH = 0.3123 nm and cH = 3.0053 nm. It has been shown that the metallic close packed sublattice of the ??zeta-Ta4C3 – x carbide is formed by alternating blocks, where metal atoms are located both in the fcc and hcp sublattices of the TaCy cubic and Ta2C hexagonal carbides, respectively Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Lipatnikov, V. N.