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Phase transformation of melamine at high pressure and temperature

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Abstract

Pyrolysis experiments of melamine were carried out under high pressure of 5 GPa and different temperatures. The crystal structure, chemical bonding, and composition of the melamine pyrolysate were studied by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray energy-dispersive analysis (EDX), and combustion elemental analysis. A new C–N–H phase was found in the pyrolysate at 5 GPa and 800 °C. The structure is tentatively indexed as a monoclinic symmetry, with the following lattice parameters: a = 8.5368 (±0.0009)Å, b = 9.1153 (±0.0010)Å, c = 10.2440 (±0.0011)Å, α = γ = 90°, and β = 95.5696 (±0.0016)°. The photoluminescence behavior of the pyrolysates was investigated. A blue emission at 421 nm for the C–N–H phase was observed under the ultraviolet light excitation of 365 nm.

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Acknowledgements

The authors acknowledge financial supports from the National Science Foundation of China (grant nos. 10474083, 50532020, and 50472051), Science Foundation of Hebei Province (grant no. E2005000353), and NBRPC (grant no. 2005CB724400).

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, P.R. China

    D. L. Yu, J. L. He, Z. Y. Liu, B. Xu, D. C. Li & Y. J. Tian

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  1. D. L. Yu
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  2. J. L. He
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  3. Z. Y. Liu
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  4. B. Xu
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  5. D. C. Li
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  6. Y. J. Tian
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Correspondence to Y. J. Tian.

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Yu, D.L., He, J.L., Liu, Z.Y. et al. Phase transformation of melamine at high pressure and temperature. J Mater Sci 43, 689–695 (2008). https://doi.org/10.1007/s10853-007-2148-y

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  • DOI: https://doi.org/10.1007/s10853-007-2148-y

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