Creep in Vacuum of MgO Single Crystals and the Electric Field Effect
作者:
W. S. Rothwell,
A. S. Neiman,
期刊:
Journal of Applied Physics
(AIP Available online 1965)
卷期:
Volume 36,
issue 7
页码: 2309-2316
ISSN:0021-8979
年代: 1965
DOI:10.1063/1.1714469
出版商: AIP
数据来源: AIP
摘要:
Experimental techniques are described and data are presented on bending creep of single‐crystal MgO in vacuum from 800° to 1630°C. Evidence is discussed which supports the conclusion that creep near 1000°C is rate‐controlled by cross‐slip of screw dislocations with an activation energy of 1.5±0.25 eV. Creep above 1300°C takes place at a constant rate with an activation energy of 5.85±0.73 eV and a stress dependence exponent of 3. This creep is attributed to oxygen‐ion diffusion‐controlled climb of edge dislocations.The effect of an electric field to give a transient acceleration of the creep rate is described. Experiments to define and characterize this effect are described and discussed.
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