Abstract
Abstract Sequences of I Incommensurate-II Commensurate-Ill Commensurate transitions in TMA2ZnCL4, were observed in real time by synchrotron X-ray topography. For I-II transition, the coexistence of commensurate and incommensurate phases causes, on a small temperature range near the lock-in transition, the formation of macroscopic domains bounded by defects which can be identified as deperiodisation lines. These lines have their emergence points on directions which can be indexed in the superspace.
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