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- W1993576779 abstract "The lattice perfection of as-grown specimens of the very anisotropically bound, plastic (CnH2n+1NH3)2CuCl4 crystals with n = 1, 2, 3 has been investigated. Polarizing microscopy, Laue diffraction, X-ray absorption and continuous X-radiation topography were used, since they are very useful for quick qualification and for selection. The microstructure has been resolved in more detail by Lang topography. The crystals were grown from aqueous solutions (i) from a seed by controlled cooling, (ii) in situ by isothermal evaporation, and (iii) in situ by a temperature gradient method. In the first method the growing crystal was recorded by time lapse microphotography. From this and from X-ray pictures it was found that the lattice perfection was mainly determined by unstable and irregular concentration profiles. These caused elevated and overhanging areas (satellites), splitting up of side faces and capturing of liquid. The main other volume defects were damage and deformation due to handling. In general the diagonal areas exhibited the highest perfection. The sectors could be rather perfect. In many cases satellites showed no lattice mismatch with the parent crystal. Growth bands were absent. Occasionally contrasting sector boundaries were observed on Lang topographs. Thin crystals contained a high number of mixed dislocations due to plastic deformation. Growth dislocations appeared from liquid inclusions, in particular from tiny ones. They were edge dislocations running in the 〈110〉 directions with Burgers vectors parallel to 〈110〉. Neither edge dislocations along the a- or b-direction, nor screw dislocations have been found. The edge dislocations seemed to stimulate “healing” of their sectors. Contrasts similar to those of “sector boundaries” were raised by step bunches growing together along 〈100〉 or 〈010〉 directions." @default.
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- W1993576779 date "1978-09-01" @default.
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- W1993576779 title "Optical and X-ray characterization of the layer type perovskites (CnH2n+1NH3)2CuCl4 in relation to their growth" @default.
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- W1993576779 doi "https://doi.org/10.1016/0022-0248(78)90188-4" @default.
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