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- W4323350929 abstract "The present study provides a comprehensive assessment of the synthesis, crystal evolution, and degree of inversion of the spinel CoCr2O4 (i.e., cochromite) by a modified sol–gel method using propylene oxide and ultrasonication. Ultrasonic assistance promotes the dissociation and dispersibility of Co2+ and Cr3+ precursors, contributing to the hydrolysis reaction to form hydrated ions. Propylene oxide serves as a proton scavenger to provide the conditions needed for homogeneous gelation. Heat treatments at different temperatures (400, 550, and 700 °C) for different durations (1, 4, and 8 h) have been applied to follow the crystal evolution and the inversion of the spinel system. The formation of CoCr2O4 particles was observed at approximately 400 °C. An increase in calcination temperature induced particle size growth (from 12 to 42 nm) and sintering effects. A significant decrease in the specific surface area (from 144 to 33 m2 g−1) was observed with changes in the lattice parameter (8.304–8.334 Å). Raman, XPS, XRD, and Rietveld analyses indicated the presence of a pure cochromite phase. The Bertaut method has been applied to monitor the inversion process of CoCr2O4 during post-synthesis heat treatment. The spinel conformation became a regular type beyond 700 °C, whereas a fully inverted structure was obtained at lower temperatures. The modified sol–gel method may be convenient for large-scale production to synthesize other spinel-type compounds." @default.
- W4323350929 created "2023-03-08" @default.
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- W4323350929 date "2023-07-01" @default.
- W4323350929 modified "2023-10-01" @default.
- W4323350929 title "Crystal evolution of nano-sized CoCr2O4 synthesized by a modified sol–gel method" @default.
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- W4323350929 doi "https://doi.org/10.1016/j.jpcs.2023.111315" @default.
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