N 52 New Representatives of the Raddlesden–Popper Homologous Series: Anion-Deficient Oxides Sr3Co2-xZnxO6+δ(=0.5, 0,75) / T. I. Chupakhina, N. A. Zaitseva, M. A. Melkozerova, G. V. Bazuev // Russian Journal of Inorganic Chemistry. - 2006. - Vol. 51, № 8. - P1157-1162 : il. - Bibliogr. : p. 1162 (19 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): КОМПЛЕКСНЫЕ ОКСИДЫ -- РАДДЛЕСДЕНА-ПОППЕРА СТРУКТУРА Аннотация: New complex oxides Sr3Co2 –ZnxO6+δ with x= 0.50 and 0.75, which belong to the Raddlesden– Popper homologous series (An+ 1BnO3n+ 1;n= 2), are synthesized. The structural and magnetic properties of these oxides are studied. The unit cell parameters a and c for the x= 0.5 and 0.75 compounds are 0.38541(2) and 0.38573(2) nm and 2.03543(1) and 2.03999(11) nm, respectively. The magnetic susceptibility of Sr3Co1.5Zn0.5O6.25 as a function of temperature obeys the Curie–Weiss law (χ=C/(T–θ)) only within a narrow temperature range from 250 to 300 K. At low temperatures, this compound has spin-glass properties with a characteristic magnetic and temperature hystereses and a freezing temperature of Tg= 25–30 K Полный текст |