Dislocation Damping in Magnesium Oxide Crystals at Low Frequencies
- 1 December 1962
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 33 (12) , 3493-3498
- https://doi.org/10.1063/1.1702435
Abstract
Amplitude dependent internal friction measurements have been made on MgO crystals over the temperature range 0° to 300°C at frequencies of ∼5 cps. Analysis of the temperature dependency of the critical breakaway strain, delineating the transition from amplitude independent to amplitude dependent internal friction, permits an evaluation of the relative pinning strengths of the Fe2+ and Fe3+ ions, determined on specimens from bulk sources. The Fe3+ ion exhibits a binding energy of 0.035 eV, whereas the Fe2+ ion has either a lower binding energy and/or a lower mobility which precludes the development of an equilibrium atmosphere. Optical absorption measurements confirm the presence of the Fe3+ ion in one bulk crystal and its absence in the other.This publication has 15 references indexed in Scilit:
- On the fracture behaviour of magnesium oxide bi-crystalsPhilosophical Magazine, 1961
- Effect of slip distribution on the fracture behaviour of magnesium oxide single crystalsPhilosophical Magazine, 1961
- Temperature Dependence of Plastic Yield Stress of Single Crystals of Magnesium OxideJournal of the American Ceramic Society, 1960
- Mechanical Properties of Magnesia Single Crystals Corn pressionJournal of the American Ceramic Society, 1960
- Effect of Impurities and Heat‐Treatment on Ductility of MgOJournal of the American Ceramic Society, 1960
- The Internal Friction of Annealed Copper at Low TemperaturesProceedings of the Physical Society, 1959
- Effect of Surface Conditions on Room‐Temperature Ductility of Ionic CrystalsJournal of the American Ceramic Society, 1958
- Electron transfers among transition elements in magnesium oxideDiscussions of the Faraday Society, 1958
- Theory of Mechanical Damping Due to DislocationsJournal of Applied Physics, 1956
- Die Verfärbung von MgO-Kristallen durch gittereigene BausteineThe European Physical Journal A, 1951