1998 | OriginalPaper | Chapter
Ferroelectrics with an Incommensurate Phase
Authors : Professor Boris A. Strukov, Professor Arkadi P. Levanyuk
Published in: Ferroelectric Phenomena in Crystals
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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In a series of ferroelectrics (NaN02, (NH4)2BeF4 etc.) the transition into the polar phase is preceded by a transition into a rather peculiar intermediate phase called the incommensurate phase, i.e., when the the temperature falls off, there is observed the following sequence of phases: symmetric/incommensurate/polar (commensurate) (Fig. 11.1).