Вид документа : Статья из журнала Шифр издания : 54/E 27 Автор(ы) : Chukalkin Yu. G., Teplykh A. E., Kellerman D. G., Gorshkov V. S. Заглавие : Effects of Structural Disorder in Lithium Manganite and Titanate Oxides Место публикации : Physics of the Solid State. - 2010. - vol. 52, № 5. - С. 1006-1009: il. Примечания : Bibliogr. : p. 1009 (11 ref.) ISSN: 1063-7834 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): манганит лития--титанаты--стехиометрия Аннотация: The structures and magnetic states of stoichiometric lithium manganite LiMn2O4 and manganites and titanates Li1.33Mn1.67O4 and Li1.33Ti1.67O4 with excess lithium in both the initial (as-synthesized) state and after irradiation by fast (Eeff ≥ 1 MeV) neutrons with a fluence of 2 × 1020 cm–2 have been studied using neutron diffraction, X-ray diffraction, and magnetic methods. It has been established that the irradiation brings about a noticeable redistribution of manganese, titanium, and lithium cations over nonequivalent tetrahedral (8a) and octahedral (16d) positions of a spinel lattice. This structural disorder causes a radical change in the physical properties of the materials under study. The charge order existing in the initial LiMn2O4 sample is destroyed. There arises a strong intersublattice indirect exchange interaction Mn(8a)–O–Mn(16d). The disorder is accompanied by the antiferromagnet–ferrimagnet (LiMn2O4) and paramagnet–ferrimagnet (Li1.33Mn1.67O4) magnetic transitions Доп.точки доступа: Chukalkin, Yu. G.; Teplykh, A. E.; Kellerman, D. G.; Келлерман Дина Георгиевна; Gorshkov, V. S.