In situ observation of the humidity controlled polymorphic phase transformation in glycine microcrystals

Isakov, D., Petukhova, D., Vasilev, S., Nuraeva, A., Khazamov, T., Seyedhosseini, E. , Zelenovskiy, P., Shur, V. Y. and Kholkin, A. L. (2014) In situ observation of the humidity controlled polymorphic phase transformation in glycine microcrystals. Crystal Growth and Design, 14(8), pp. 4138-4142. (doi:10.1021/cg500747x)

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Abstract

Glycine is a model crystal exhibiting three polymorphic phases and important functional properties such as piezoelectricity and ferroelectricity. We report here in situ observation of the irreversible transformation of the solution-grown glycine crystals from a β phase into a γ phase. The slow transformation process was monitored by piezoresponse force microscopy at room temperature. The process of β to γ conversion was entirely controlled by the variation of relative humidity in the sample chamber. The results show that the rate of phase transformation in glycine is humidity dependent with a threshold of about 25% RH. It is demonstrated that the phase boundary is highly rugged and the transformation front propagates inhomogeneously along the polar axis of the β phase. The mechanism of the phase transformation is discussed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Seyed Hosseini, Dr Ensieh
Authors: Isakov, D., Petukhova, D., Vasilev, S., Nuraeva, A., Khazamov, T., Seyedhosseini, E., Zelenovskiy, P., Shur, V. Y., and Kholkin, A. L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Crystal Growth and Design
Publisher:American Chemical Society
ISSN:1528-7483
ISSN (Online):1528-7505
Published Online:23 July 2014

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