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Thermal decomposition and structural dynamics in perovskite (C2H5NH3)2CdCl4 crystals

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Abstract

In this study, (C2H5NH3)2CdCl4 single crystals were grown, and their thermal properties were studied by the thermogravimetric analysis and differential scanning calorimetry. Phase transition temperature above room temperature was observed at 470 K. In addition, the cation dynamics in this crystal were investigated by 1H magic-angle spinning nuclear magnetic resonance (MAS NMR) and 13C cross-polarization (CP)/MAS NMR experiments. The Bloembergen–Purcell–Pound curves for 1H T1ρ and 13C T1ρ in C2H5NH3 cation exhibited minimum values, and these curves represent C2H5NH3 and C2H5 rotational motions. The activation energy for 1H in the C2H5NH3 cation is Ea = 22.63 kJ mol−1, whereas those for 13C in CH3 and CH2 are Ea = 18.05 and 19.14 kJ mol−1, respectively. Furthermore, the proton dynamics of C2H5NH3 undergo faster rotation than carbons. This implies that the molecular motion for 1H is enhanced at the C-end and N-end of an organic cation, whereas the molecular motion is not free at the main chain carbons of the organic cation.

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Acknowledgements

This research was supported by the Basic Science Research program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (2018R1D1A1B07041593).

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  1. Analytical Laboratory of Advanced Ferroelectric Crystals, Jeonju University, Jeonju, 55069, South Korea

    Ae Ran Lim

  2. Department of Science Education, Jeonju University, Jeonju, 55069, South Korea

    Ae Ran Lim

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Lim, A.R. Thermal decomposition and structural dynamics in perovskite (C2H5NH3)2CdCl4 crystals. J Therm Anal Calorim 142, 2243–2249 (2020). https://doi.org/10.1007/s10973-019-09187-4

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