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VOLUME 35 (1982) | ISSUE 3 | PAGE 119
Transitional structure in potassium dideuterophosphate crystals during the phase transition
A multilayer transitional structure has been observed at the time of the ferroelectric phase transition in crystals of potassium dideuterophosphate (DKDP) by a method of x-ray topography using synchrotron radiation. Layers of the paraelectric and ferroelectric phases with a period of 120-500 μ m arise in the direction perpendicular to the tetragonal axis. It is suggested that this structure results from the simultaneous effect of the anisotropy represented by the spontaneous elongation of the crystal and the decrease in the phase-transition temperature as the pressure rises.