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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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The creep rate of polycrystalline Fe 3 O 4 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) m 2 s -1 , with oxygen vacancies suggested as the mobile species. © 1990.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:12
Last Modified: 23 Nov 2017 04:11