B 33 Bazuev, G. V. Synthesis and magnetic properties of incommensurate phases A4CuMn2O9 (A = Ca, Sr) [] = Synthesis and magnetic properties of incommensurate phases A4CuMn2O9 (A = Ca, Sr) / G. V. Bazuev, V. N. Krasil'nikov, D. G. Kellerman // Journal of Alloys and Compounds. - 2003. - V. 352. - С. 190-196. - Bibliogr.: p. 195-196 (26 ref.) . - ISSN 0925-8388 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): CuO -- MnO2 -- CaMnO3 -- Ca4CuMn2O9 -- ТВЕРДОФАЗНЫЙ СИНТЕЗ -- СИНТЕЗ ТВЕРДОФАЗНЫЙ -- Sr4CuMn2O9 -- Ca4CuMn2O9 -- Cu -- Mn -- МЕДЬ -- МАРГАНЕЦ -- Ca -- Sr -- КАЛЬЦИЙ -- СТРОНЦИЙ -- СЛОЖНЫЕ ОКСИДЫ -- ОКСИДЫ СЛОЖНЫЕ -- МАГНИТНЫЕ СВОЙСТВА -- СВОЙСТВА МАГНИТНЫЕ -- КАРБОНАТЫ -- МАНГАНИТ КАЛЬЦИЯ Аннотация: New complex oxides A4CuMn2O9 (A = Ca and Sr) belonging to the family of quasi-one-dimensional compounds have been obtained by solid-phase synthesis from Ca and Sr carbonates and oxides CuO and MnO2. It was established that both oxides are incommensurate and can be characterized by two sublattice with the same a, but different c (c1 and c2) parameters. Magnetic susceptibility measurement results were interpreted with allowance for exchange-bound dimers Mn(4+)-Mn(4+) and paramagnetic centers Cu(2+). Magnetic measurements revealed the presence of calcium manganate CaMnO3 in Ca4CuMn2O9 |