Abstract
Nickel chromite formation was studied using dense polycrystals and single crystals of and . The influence of time, temperature, and oxide purity on spinel structures and formation rates was determined. Experiments were performed by reacting pure pellets with pure and manganese‐doped pellets of . All reactions were done in air for times ranging from 24 to 640hr, and at temperatures from 1200° to 1500°C.The rates of nickel chromite formation in dense, crack‐free specimens are two orders of magnitude smaller than the rates of formation in porous specimens, or at surfaces of dense specimens. These solid‐state reaction rates are affected, and possibly controlled, by the rate of chromium dissolution in the nickel oxide, while the reaction rates at free surfaces are controlled bydiffusion of Ni2+ and Cr3+ through the spinel.
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