'Modulated Lattice Relaxation'and Incommensurability of Lattice Waves in β-Based Premartensitic Phase

概要

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A microscopic model has been proposed which reproduces the extra-ordinarycharacteristics of the diffraction pattern observed in the premartensitic phaseof TiNi. The modulated lattice relaxation (MLR) model is constructed on thetwo basic assumptions : (i) existence of sharp dip in phonon dispersion surfaceof the host lattice (ii) existence of a particular type of defects. In this system,the host lattice distorts giving rise to modulated lattice relaxation extendingaround the defect. The diffraction effect due to such MLR produces incommensu-rate superlattice reflections and a uniform shift of the peak positions from thecommensurate value towards (or away from) the origin of the reciprocal spacehas been obtained, which is consistent with the observations. A microscopicmechanism of non-diffusional phase transitions is discussed on the basis of theproposed model.
社団法人日本物理学会の論文
1985-08-15