Scanning pyroelectric microscopy revealing the spatial polarity distribution in topologically centric crystals of trans-4-chloro-4′-nitrostilbene
Literature Information
N.-R. Behrnd, G. Couderc, M. Wübbenhorst, J. Hulliger
Scanning pyroelectric microscopy (SPEM) was applied to investigate grown-in polarity in trans-4-chloro-4′-nitrostilbene (CNS) single crystals. Sectors {011} and {01} were scanned for cross sections perpendicular to the a-direction. A rotational analysis for {011}, {01} faces was performed for a needle like crystal turned around the a-axis. All pyroelectric experiments confirm a bipolar grown-in state of polarity for sector involving the twofold axis b. These measurements agree with theoretical force field and stochastic calculations, predicting a bipolar state and a nearly identical extent of polarity for two different sectors.
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