Design of pyroelectric mixed crystals having a varying degree of polarity: The l -asparagine·H2O/ l -aspartic acid system

A. Belitzky, I. Weissbuch, Y. Posner-Diskin, M. Lahav, I. Lubomirsky

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12 Scopus citations


As part of an ongoing program on the design of functional materials with a varying degree of polarity, we investigated the processes of conversion of a nonpolar host, l-asparagine monohydrate crystal (space group P212121), into a conglomerate of mixed polar sectors when grown in the presence of varying amounts of l-aspartic acid guest at the glass-aqueous/solution interface. The structure, composition, and the reduction of symmetry of the mixed crystals were confirmed with pyroelectric coefficient measurements, X-ray diffraction, and HPLC analysis and supported by atom-atom potential energy computations. The pyroelectricity measured at the (010) and (01¯0) faces imply the formation of hybrid crystals with top and bottom parts having opposite polarities. Pyroelectric coefficients measured at these two faces as a function of the occluded guest concentration increase linearly up to 8 wt %/wt of guest, followed by an enhancement of polarity at 8-12 wt %/wt of guest and subsequent reduction upon an increase up to 16 wt %/wt of guest. An interpretation of the magnitude of the pyroelectric effect on guest concentration is proposed.

Original languageEnglish
Pages (from-to)2445-2451
Number of pages7
JournalCrystal Growth and Design
Issue number5
StatePublished - 6 May 2015
Externally publishedYes

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© 2015 American Chemical Society.


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