Scanning pyroelectric microscopy on large crystals reveals the three-dimensional polarization distribution in AlPO 4 -5 crystals. AlPO 4 -5 probably grows in such a way that one particular absolute configuration is formed. In general twinned crystals are formed. The twin domains exhibit an opposite polarization. A single domain is found when crystals are grown from a substrate. In some cases the crystals show a more complex domain structure, which can be attributed to specific growth conditions. From the polarization distribution the history of the crystal growth can be retrieved. A mechanism for the adsorption of p -nitroaniline molecules is proposed on the basis of the polarization distribution in AlPO 4 -5 crystals and earlier observed preferential orientation of this guest molecule in the host structure.
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Klap et al. (1999) studied this question.
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