Spinel precipitation in Sn4+-doped Co1−xO polycrystals with dispersed Co2+xSn1−xO4 particles

Pan, Ching-Yui; Shen, Pouyan

doi:10.1016/j.ceramint.2010.05.023

Cited by 1 publication

(2 citation statements)

References 26 publications

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“…Spinel phases possess two dedicated cation sublattices, making the precursor→spinel transformation more complicated than the precursor→tenorite transformation. Rocksalt→spinel transformations have been observed before in other materials, such as Sn-CoO and Ti-MgO [39,61]. The transformation occurs when a critical concentration of cation interstitials and vacancies is reached, leading to a collapse of the rocksalt structure and the rearrangement of the atoms [62].…”

Section: Transformation Sequencementioning

confidence: 78%

“…The transformation occurs when a critical concentration of cation interstitials and vacancies is reached, leading to a collapse of the rocksalt structure and the rearrangement of the atoms [62]. Spinel phases often nucleate on dislocations as well as vacancy and defect clusters in rocksalt oxides [61]. However, many spinel nucleation events are preceded by the formation of a precursor phase that nucleates on cation vacancies, such as in Ti-MgO and Zr-TiO 2 [39,63].…”

Section: Transformation Sequencementioning

confidence: 99%

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Nucleation and growth behavior of multicomponent secondary phases in entropy-stabilized oxides

Dupuy

Chellali

Hahn

et al. 2022

Journal of Materials Research

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The rocksalt structured (Co,Cu,Mg,Ni,Zn)O entropy-stabilized oxide (ESO) exhibits a reversible phase transformation that leads to the formation of Cu-rich tenorite and Co-rich spinel secondary phases. Using atom probe tomography, kinetic analysis, and thermodynamic modeling, we uncover the nucleation and growth mechanisms governing the formation of these two secondary phases. We find that these phases do not nucleate directly, but rather they first form Cu-rich and Co-rich precursor phases, which nucleate in regions rich in Cu and cation vacancies, respectively. These precursor phases then grow through cation diffusion and exhibit a rocksalt-like crystal structure. The Cu-rich precursor phase subsequently transforms into the Cu-rich tenorite phase through a structural distortion-based transformation, while the Co-rich precursor phase transforms into the Co-rich spinel phase through a defect-mediated transformation. Further growth of the secondary phases is controlled by cation diffusion within the primary rocksalt phase, whose diffusion behavior resembles other common rocksalt oxides. Graphical abstract

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Section: Transformation Sequencementioning

confidence: 78%