Study of Defect Structures in BeO Single Crystals by X-Ray Diffraction Topography
- 1 December 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (12), 3815-3822
- https://doi.org/10.1063/1.1713954
Abstract
X‐ray diffraction topography methods and supplementary optical microscopy were used to examine pyramidal and prismatic BeO crystals grown from lithium molybdate flux. The crystals appeared to have a high degree of perfection in that few dislocation lines were observed. Several specific types of defect structures were observed, however, in most of the crystals studied. The inversion‐twin core structure was visible by image contrast effects from the twin boundary as well as by unequal image contrast on either side of the boundary. A screw dislocation line, possibly a group of many dislocations, commonly was present in the core and ran the full length of the crystal. Growth strata parallel to the active growth surfaces were also present. The topographs also revealed that considerable surface damage can be inflicted by intercrystal abrasion, much of which is removed by thermal annealing.Keywords
This publication has 11 references indexed in Scilit:
- Translation-permutation operator algebra for the description of crystal structures. II. Interstice lattice stacking faultsActa Crystallographica, 1965
- Growth and properties of beryllium oxide single crystalsJournal of Nuclear Materials, 1964
- Electron Spin Resonance of Boron in Single—Crystal BeOThe Journal of Chemical Physics, 1964
- Fault Structures in WurtzitePhysica Status Solidi (b), 1964
- The Crystal Structure and Polarity of Beryllium OxideJournal of the Electrochemical Society, 1964
- Polar Properties of BeO Single CrystalsJournal of Applied Physics, 1963
- Studies of Individual Dislocations in Crystals by X-Ray Diffraction MicroradiographyJournal of Applied Physics, 1959
- Etch figures on silicon ironCzechoslovak Journal of Physics, 1958
- Helical dislocations and spiral etch-pitsPhilosophical Magazine, 1957
- The influence of dislocations on crystal growthDiscussions of the Faraday Society, 1949