Phason strain and structural perfection in the Zn-Mg-rare-earth icosahedral phases

Phason strain and structural perfection in the Zn-Mg-rare-earth icosahedral phases

The structural perfection of eight samples of icosahedral Zn-Mg-R (R = Y, Ho and Tb) single grains has been studied by high resolution X-ray diffraction. Four samples present a systematic peak shift proportional to Q sub per characteristic of a linear phason strain. Two other samples present a peak...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1999-09, Vol.294-296, p.127-130
Hauptverfasser: De Boissieu, M, Fisher, I R, Sato, T J, Letoublon, A, Boudard, M, Agliozzo, S, Mancini, L, Gastaldi, J, Canfield, P C, Goldman, A I, Tsai, A P
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
container_volume 294-296
creator De Boissieu, M
Fisher, I R
Sato, T J
Letoublon, A
Boudard, M
Agliozzo, S
Mancini, L
Gastaldi, J
Canfield, P C
Goldman, A I
Tsai, A P
description The structural perfection of eight samples of icosahedral Zn-Mg-R (R = Y, Ho and Tb) single grains has been studied by high resolution X-ray diffraction. Four samples present a systematic peak shift proportional to Q sub per characteristic of a linear phason strain. Two other samples present a peak splitting proportional to Q sub per . Only two samples had their Bragg peak position corresponding to the ideal one, with a width increasing linearly with Q sub per . The perfection of one of these last two samples was investigated by synchrotron monochromatic X-ray topography. It was found to be a microstructure similar to the one exhibited by conventional crystals grown by the same technique (flux-growth).
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title Phason strain and structural perfection in the Zn-Mg-rare-earth icosahedral phases
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