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Creep and oxygen diffusion in magnetite

Crouch, AG and Robertson, J (1990) Creep and oxygen diffusion in magnetite. Acta Metallurgica Et Materialia, 38. pp. 2567-2572. ISSN 0956-7151

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Abstract

The creep rate of polycrystalline Fe3O4 has been measured as a fonction of stress and oxygen partial pressure in the temperature range 480-1100°C. A regime of power law creep is found at high stress, with a stress exponent of ≈- 3.1 and an activation energy of 264 kJ/mol. A regime of diffusional flow is found at lower stresses and is interpreted as Nabarro-Herring creep. The data for the two regimes are combined to deduce an oxygen diffusion coefficient of ≈-10-5 exp(-264 kJ/mol/RT) m2s-1, with oxygen vacancies suggested as the mobile species. © 1990.

Item Type: Article
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Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 16 Jul 2015 13:30
Last Modified: 04 Aug 2015 21:34
DOI: 10.1016/0956-7151(90)90268-L