Abstract
Diffusion in a multicomponent system with different diffusivities of the constituent components leads to demixing, which can be a source of material deterioration. A new experimental technique has been investigated to study demixing in oxides under an oxygen potential gradient. The oxygen potential gradient across initially homogeneous polycrystalline (Ni, Co)O was established by applying an electric potential across a yttria‐stabilized‐zirconia (YSZ) tablet in the galvanic cell: Air/Pt/YSZ/Pt/(Ni, Co)O/Air. A low oxygen partial pressure was established at the left side of (Ni, Co)O, while the right side was exposed to flowing air (0.21 atm ). Steady‐state demixing profiles were observed after annealing for 10 days. Discrepancies were sometimes noticed between runs because of possible leakage problems. Growth of the sample toward the high oxygen pressure side was observed, and was used to estimate the steady‐state velocity. An attempt is made to show how demixing experiments combined with atomistic calculations can be used as a possible means to estimate the microscopic properties of materials.
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