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Investigation on the thermal expansion of α-CL-20 with different water contents

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Abstract

The thermal expansions of three kinds of α-CL-20 crystals have been investigated in the temperature range from 30 to 130 °C by means of various-temperature X-ray powder diffraction (XRD) together with Rietveld refinement. The crystals were characterized by SEM, XRD, FTIR, and DSC/TG. The results show that the three samples contain 1/2, 1/4 mol, and none structural water, respectively. The α-CL-20 crystals all perform linear and anisotropic thermal expansion, while some differences exist. The unit-cell axes increase linearly with increasing temperature except for the a-axis. The expansion along the a-axis switches from positive to negative thermal expansion at 90 °C for α-CL-20·1/2H2O. The a-axis exhibits positive thermal expansion (PTE) with thermal irresilience for α-CL-20·1/4H2O while PTE with thermal resilience for the anhydrous α-CL-20. The differences are caused by the structural water. The removal of structural water leads to the collapse of a-axis, further results in structural changes of the unit cell. Different water contents can cause different degree of structural changes, leading to the difference of thermal expansion behaviors.

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Acknowledgements

This study was financially supported by the Youth Talent Training Foundation of Institute of Chemical Materials (QNRC-201205), the National Natural Science Foundation of China (11472252, 11372290), and the Foundation of China Academy of Engineering Physics (2012A0201007).

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Authors and Affiliations

  1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, People’s Republic of China

    Liu Pu, Jinjiang Xu, Yong Tian, Haobing Zhang, Xiaofeng Liu & Jie Sun

  2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, People’s Republic of China

    Liu Pu & Gongbao Song

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  1. Liu Pu
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Correspondence to Jie Sun.

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Pu, L., Xu, J., Song, G. et al. Investigation on the thermal expansion of α-CL-20 with different water contents. J Therm Anal Calorim 122, 1355–1364 (2015). https://doi.org/10.1007/s10973-015-4884-6

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