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Phase-transition-like phenomenon of NH4H2PO4 observed using MAS NMR and static NMR near characteristic temperature

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Abstract

We used Fourier-transform nuclear magnetic resonance (NMR) spectroscopy to investigate the temperature dependences of the chemical shift and resonance frequency observed with magic-angle spinning NMR and static NMR, respectively, to confirm a high-temperature behavior of NH4H2PO4. The hydrogen bonds in both O–H–O between two PO4 groups and N–H–O between NH4 and PO4 were distinguished, and the changes occurring in the chemical shift and resonance frequency near the characteristic temperature TP are related to changes in the atomic positions. The experimental results of thermogravimetric analysis conducted to interpret the high-temperature phenomena without the critical change around TP are consistent with a phase-transition-like phenomenon at TP.

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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 Science and Technology (2016R1A6A1A03012069) and (2015R1A1A3A04001077).

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Authors and Affiliations

  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

  3. Western Seoul Center, Korea Basic Science Institute, Seoul, 03759, South Korea

    Seen Ae Chae

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  1. Ae Ran Lim
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Correspondence to Ae Ran Lim.

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Lim, A.R., Chae, S.A. Phase-transition-like phenomenon of NH4H2PO4 observed using MAS NMR and static NMR near characteristic temperature. J Therm Anal Calorim 130, 885–889 (2017). https://doi.org/10.1007/s10973-017-6457-3

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  • DOI: https://doi.org/10.1007/s10973-017-6457-3

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