Dynamical studies of the formation process of ordered phase at the phase transition by means of light, X-ray and neutron scattering

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The results of the activity of the four subprojects are as follows:A. Decomposition process of polymer systems has been studied by means of light scattering with a great success, clarifying scaling laws. Application of neutron scattering has been discussed with a conclusion that it needs large and homogeneous samples to be studied.B. Decomposition process of alloy systems has been studied by means of various methods, such as X-ray diffraction, neutron scattering, electeon microscope, and atom-probe field emission microscope. These results revealed detailed informations, particularly in relation to elastic strain energy and surface energy.C. Commonly to both polymer and alloy system, it has been found scaling law, evolution power law, and power law of the structure function. Possible origins, the range of applicability and universality of these laws are discussed.D. New types of ordering process other than the decomposition process of polymer and alloys are found and investigated. These includes ordering process in anisotropic magnets, incommensurate phase transition in diclectrics, ordering process in the system with shear flow, and phonons in alloys undergoing spinodal decomposition.