Вид документа : Статья из журнала Шифр издания : 54/T 82 Автор(ы) : Kharton V. V., Yaremchenko A. A., Shaula A. L., Patrakeev M. V., Naumovich E. N., Logvinovich D. I., Frade J. R., Marques F. M. B. Заглавие : Transport properties and stability of Ni-containing mixed conductors with perovskite- and K2NiF4-type structure Параллельн. заглавия :Transport properties and stability of Ni-containing mixed conductors with perovskite- and K2NiF4-type structure Место публикации : Journal of Solid State Chemistry. - 2004. - V. 177, N 1. - С. 26-37. - ISSN 0022-4596. - ISSN 0022-4596 Примечания : Bibliogr.: p. 36-37 (43 ref.) ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The total conductivity and Seebeck coefficient of a series of Ni-containing phases, including La2Ni1-xMxO4+delta (M = Co, Cu; x = 0.1-0.2) with K2NiF4-type structure and perovskite-like La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-delta and La0.50Pr0.50Ga0.65Mg0.15Ni0.20O3-delta, were studied in the oxygen partial pressure range from 10(-18) Pa to 50 kPa at 973_1223 K. Within the phase stability domain, the conductivity of layered nickelates is predominantly p-type electronic and occurs via small-polaron mechanism, indicated by temperature-activated hole mobility and p(O2) dependencies of electrical properties. In oxidizing conditions similar behavior is characteristic of Ni-containing perovskites, which exhibit, however, significant ionic contribution to the transport processes. The role of ionic conduction increases with decreasing p(O2) and becomes dominant in reducing atmospheres. All nickelate-based phases decompose at oxygen pressures considerably lower with respect to Ni/NiO boundary. The partial substitution of nickel in La2Ni(M)O4+delta has minor effect on the stability limits, which are similar to that of La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-delta. On the contrary, praseodymium doping enhances the stability of La0.50Pr0.50Ga0.65Mg0.15Ni0.20O3-delta down to p(O2) values as low as 10(-17)-10(-10) Pa at 1023_1223 K Доп.точки доступа: Kharton, V. V.; Yaremchenko, A. A.; Shaula, A. L.; Patrakeev, M. V.; Патракеев Михаил Валентинович; Naumovich, E. N.; Logvinovich, D. I.; Frade, J. R.; Marques, F. M. B.