Author/Authors :
Boudard، نويسنده , , M. and Létoublon، نويسنده , , A. and de Boissieu، نويسنده , , M. and Ishimasa، نويسنده , , T. and Mori، نويسنده , , M. and Elkaim، نويسنده , , E. and Lauriat، نويسنده , , J.P.، نويسنده ,
Abstract :
The reversible phase transformation between the crystalline multidomain structure of the rhombohedral phase to the perfect icosahedral quasicrystalline state at high temperature has been studied by in situ X-ray diffraction on a four-circle diffractometer using synchrotron radiation. The transient state known as the 5-fold modulated state has been observed and its evolution with temperature is characterised. Diffuse scattering located close to the Bragg reflections is observed in the studied temperature range. Its evolution with temperature shows a reversible transformation with an important change of shape in agreement with the proximity of a 5-fold phason instability.
