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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