Solid solutions in the Zn-Co-O system: Physicochemical properties |
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| Authors: | G. D. Nipan V. A. Ketsko T. N. Kol’tsova A. I. Stognii K. I. Yanushkevich V. V. Pan’kov A. M. Khoviv A. M. Solodukha |
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| Affiliation: | (1) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(2) Institute of Radiomaterials, Minsk, Belarus;(3) Joint Institute of Solid-State and Semiconductor Physics, National Academy of Sciences of Belarus, ul. Brovki 17, Minsk, 220072, Belarus;(4) Belarussian State University, Leningradskaya ul. 14, Minsk, 220080, Belarus;(5) Voronezh State University, Universitetskaya pl. 1, Voronezh, 394893, Russia |
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| Abstract: | Physicochemical analysis is used to study phase equilibria and to design a concentration diagram for the Zn-Co-O system. ZnO-, CoO-, and Co3O4-based mixed crystals with a fixed Zn/Co ratio have different oxygen nonstoichiometry depending on the synthesis and annealing parameters. Metastable clustering is discovered in Zn1 ? x CoxO1 + δ wurtzite solid solutions, which exist stably in the range 0 ≤ x ≤ 0.2. Magnetization investigation shows that an antiferromagnetic order exists in homogeneous Zn1 ? x CoxO1 + δ grains; this order is conserved up to 625 ± 25 K. The substitution of praseodymium, neodymium, samarium, or europium for zinc(II) cations in Zn0.9Co0.1O1 + δ does not spoil the compensated antiferromagnetism of the wurtzite unit cell. |
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