There is a decreasing trend for lattice parameter and cell volume with an increase in the cobalt content in ZnFe 2 O 4 due to a decrease in the ionic size of Co 2+ (0.72 Å) as compared with Zn 2+ (0.82 Å) in a crystal lattice. 29 The crystallite size of ZnFe 2 O 4 and Zn 0.4 Co 0.6 Fe 2 O 4 was observed using Scherrer's formula: it was 14 and 27 nm, respectively.
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Exploring moisture adsorption on cobalt-doped ZnFe<sub>2</sub>O<sub>4</sub> for applications in atmospheric water harvesting.
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