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4 citations found for Gauthier, J.-P.

There are 10 articles by Gauthier, J. click here to see these.

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Acta Cryst. (1987). A43, C157
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The structure of a natural CT opal from Ethiopia is explored with a new method, using Fourier transformation, applied to scanning electron microscope images.

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Reflexion electron diffraction (RHEED) patterns have been made on a SiC crystal fracture, showing a 102R polytypic modification on a 6H matrix. Its Zhdanov sequence can be written as |(34)433]3. The transition between 6H and 102R polytypes appears rather complex and can be explained with some typical diagrams.

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Optical simulation methods are applied to the determination of the Ramsdell sequence of silicon carbide polytypes. A new technique to produce two-dimensional models allows the simulation of intermediate and long-period polytypes. Punched computer cards are stuck together and the model so formed is photographically reduced. Simulations of 6H, 15R and 27H SiC polytypes are shown for demonstration. The `zigzag' sequence for a 51-layer polytype is identified by comparison between its RHEED pattern and the laser diagrams of 51Ra and 51Rb optical models.

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