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- W4211162015 abstract "Hydrothermal method is widely used in the synthesis of perovskite-type oxides, whereas few studies are reported for the nucleation mechanism, so that the relationship between the crystal structures and reactive activities of reactants and products is still unknown. Herein, the reaction processes are analyzed on the basis of XRD, SEM and Raman characterizations, and the nucleation mechanism is investigated for the hydrothermal synthesis of MZrO 3 (M = Ba, Sr, Ca). We propose that the negative charged cyclic tetramer complexes [Zr 4 (OH) 8 (OH) 16 ] 8- form in the hydrothermal reaction, which play major roles in the nucleation process. The tetramer complexes continually dehydrate and condensate to form substructural units composed of alkali-earth ions and 6-fold Zr tetramers; substructural units further dehydrate and distort to form perovskite structures. The reactive activation energy increases with the decreasing of M 2+ (M = Ba, Sr, Ca) ionic radius because the incorporation of smaller A site ions in the perovskite structure is accompanied by greater rotation and distortion of the ZrO 6 octahedra, leading to the decrease of reactive activity accordingly. In a word, the proposed nucleation mechanism in this paper is of great significance for the study of perovskite." @default.
- W4211162015 created "2022-02-13" @default.
- W4211162015 creator A5000349051 @default.
- W4211162015 creator A5031079359 @default.
- W4211162015 date "2022-02-01" @default.
- W4211162015 modified "2023-10-17" @default.
- W4211162015 title "Effect of crystal structures on nucleation mechanism in hydrothermal synthesis of MZrO3 (M=Ba, Sr, Ca)" @default.
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- W4211162015 doi "https://doi.org/10.1016/j.ceramint.2022.02.076" @default.
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