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The effects of stress, temperature, grain size, porosity, and O 2 partial pressure on the creep of polycrystalline Fe 2 O 3 were studied in the range 770° to 1105°C by tests in 4‐point bending and compression. Deformation rates are controlled by the stress‐directed diffusion of either oxygen or iron. Diffusion coefficients computed from the Nabarro‐Herring formula modified by including an empirical porosity‐correction term are also consistent with the values reported for oxygen and iron.
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A. G. CROUCH (1972) studied this question.
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