Вид документа : Шифр издания : 54/P 56 Автор(ы) : Lopushan V. I., Kuznetsov G. F, Pletnev R. N., Kleshchev D. G. Заглавие : Phase Transformations in gamma-Al(OH)3 under Heat Treatment in Air and Water Vapor Место публикации : Bulletin of the Russian Academy of Sciences: Physics. - 2007. - Vol. 71, № 8. - С. P. 1187-1189: il. Примечания : Bibliogr. : p. 1189 (9 ref.) ISSN: 1062-8738 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): фазовые переходы--термообработка--алюминий Аннотация: The kinetics and mechanism of phase transitions (PTs) in gibbsite (γ-Al(OH)3) under heat treatment in air and water vapor (170–550°C) have been investigated by iso- and nonisothermal thermogravimetry, X-ray phase analysis, transmission electron microscopy, 27Al nuclear magnetic resonance, and chemical analysis. It is shown that (i) the gibbsite PT in air involves two interrelated transformations occurring simultaneously:(1) gibbsite - boehmite (γ-AlOOH) and (2) gibbsite - X-ray-amorphous alumina (Al2O3); both areimplemented through the topochemical mechanism; and (ii) in water vapor only transformation of gibbsite into boehmite occurs (PT-3), which is implemented through the dissolution–precipitation mechanism. The apparent activation energies of the PTs under consideration have been determined Доп.точки доступа: Lopushan, V. I.; Kuznetsov, G. F; Pletnev, R. N.; Плетнев Рафаэль Николаевич; Kleshchev, D. G.