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Structural ferroelectric phase transition and polymorphism in 2-aminopyridine dihydrogen phosphate

Evans, Ivana Radosavljevic; Howard, Judith A.K.; Evans, John S.O.

Authors

Ivana Radosavljevic Evans

Judith A.K. Howard



Contributors

Abstract

The structural ferroelectric phase transition in 2-aminopyridine dihydrogen phosphate (2APP) has been studied by single crystal and powder X-ray diffraction between room temperature and 16 K. It has been shown that α-aminopyridine dihydrogen phosphate (α-2APP) undergoes a transition from the centrosymmetric space group C2/c in the paraelectric phase to the polar space group Cc in the ferroelectric phase. This is a second-order phase transition associated with ordering of protons in short O−H···O hydrogen bonds. This system is found to exhibit rich polymorphism: depending on crystallization conditions, three anhydrate forms and one monohydrate can be isolated. 2APP hydrate and γ-2APP have been identified for the first time, and their structures have been solved from single crystal diffraction data.

Citation

Evans, I. R., Howard, J. A., & Evans, J. S. (2008). Structural ferroelectric phase transition and polymorphism in 2-aminopyridine dihydrogen phosphate. Crystal Growth and Design, 8(5), 1635-1639. https://doi.org/10.1021/cg701076s

Journal Article Type Article
Publication Date 2008-05
Deposit Date May 6, 2013
Journal Crystal Growth and Design
Print ISSN 1528-7483
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 8
Issue 5
Pages 1635-1639
DOI https://doi.org/10.1021/cg701076s