Вид документа : Статья из журнала Шифр издания : 54/S 53 Автор(ы) : Shein I. R., Ivanovskii A. L. Заглавие : Atomic models of non-stoichiometric layered diborides M1?xB2 (M = Mg, Al, Zr and Nb) from first principles Место публикации : Physica C. - 2008. - Vol. 468. - С. P. 2224-2228: il. Примечания : Bibliogr. : p. 2228 (43 ref.) ISSN: 0921-4534 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): дибориды металлов--нестехиометрия--свойства электронные Аннотация: Two atomic models of non-stoichiometric metal diborides M1-xB2 are now assumed: (i) the presence of cation vacancies and (ii) the presence of "super-stoichiometric" boron which is placed in cation vacancy site. We have performed first principle total energy calculations using the VASP-PAW method with the generalized gradient approximation (GGA) for the exchange-correlation potential in a perspective to reveal the trends of their possible stable atomic configurations depending on the type of M cations (M = Mg, Al, Zr or Nb) and the type of the defects (metal vacancies versus metal vacancies occupied by??"super-stoichiometric"boron in forms of single atoms, dimers B2 or trimers B3). Besides we have estimated the stability of these non-stoichiometric states (on the example of magnesium–boron system) as depending on the possible synthetic routes, namely via solid-state reaction method, as well as in reactions between solid boron and Mg vapor; and between these reagents in gaseous phase. We demonstrate that the non-stoichiometric states such as B2 and B3 placed in metal sites may be stabilized, while the occupation of vacancy sites by single boron atoms is the most unfavorable Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Ivanovskii, A. L.