科研之友
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摘要
The thickness and wall profiles of twin boundaries are analysed using a novel 7-circle diffractometer. The diffractometer allows the rapid measurement of rocking curves with angular resolution of 0.001 degrees for two orthogonal rocking angles and for the detector position. Position sensitive detectors can be rotated independently around two orthogonal axes, the sample can be rotated around 3 orthogonal axes and translated in two perpendicular directions.
Measurements on twinned crystals of YBaCu(3)O(7) showed that the thickness of twin walls is ca 7 angstrom. Routine investigations on magnetically aligned ceramics alllow a full characterization of the angular spread within some 30 minutes. Quantitative diffraction profiles were obtained for ferroelastic materials with tweed microstructures.
- 出版日期1996
