R 42 Rempel, A. A. Surface Segregation of ZrC from a Carbide Solid Solution / A. A. Rempel // Physics of the Solid State. - 2002. - Vol. 44, № 1. - P68-74 : il. - Bibliogr. : p. 74 (14 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): СЕГРЕГАЦИЯ ПОВЕРХНОСТНАЯ -- КАРБИД ЦИРКОНИЯ -- ТВЕРДЫЕ РАСТВОРЫ Аннотация: The surface segregation of zirconium carbide from carbide solid solutions is investigated. The spontaneous surface segregation of ZrC grains from solid solutions in the pseudobinary ZrC–NbC system is revealed for the first time. It is demonstrated that the ZrC precipitation is associated with the decomposition of the carbide homogeneous solid solutions Zr1 – xNbxC = (ZrC)1 – x(NbC)x. The boundaries of the latent solid-phase&&decomposition region formed at T < 1200 K are determined for the solid solutions formed by ZrCy and NbCy carbides with different nonstoichiometry. The experimental and theoretical estimates obtained for the segregation energy of ZrC are equal to –50 and –31 kJ mol–1, respectively Полный текст |