Study on attribution of laser Raman spectroscopy for hopeite crystal films

Abstract

Laser Raman spectroscopy was applied to clarify the chemical structure of hopeite crystal films. Orthophosphate [PO 3−4 ], which is a regular tetrahedron, has four basic vibration modes, + ν1, ν2, ν3 + of which ν1, and ν3 are observed at 800 to 1300 cm−1. Here, the main peak corresponds to ν1 and the other peaks correspond to ν3 untied and split. A reference sample of 85% H3PO4 showed two peaks in the same region, the main peak corresponding to ν1 and the sub-peak corresponding to ν3 degenerated. It was found that a basic vibration mode of ν3 appears at 1150 cm−1. Raman spectra were observed for hopeite dissolved in HCL solution. Three peaks were found in the region, but the spectral pattern was quite different from that of crystalline hopeite, and was similar to that of H3PO4 aqueous solution. The peak intensity ratio of I 1075/I 690 differed between liquid-state hopeite and H3PO4 aqueous solution, but the band frequencies of the three peaks were consistent with each other. It was confirmed that the three peaks correspond to the P(OH)3 and PO stretching vibrations of [H3PO4] and the PO2 stretching vibration of [H2PO 4 ] formed by the dissociation of H3PO4. The PO2 stretching vibration observed at 1075 cm−1 depends on the dissociation state of H3PO4.

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Sato, N., Watanabe, K. & Minai, T. Study on attribution of laser Raman spectroscopy for hopeite crystal films. J Mater Sci 26, 1383–1386 (1991). https://doi.org/10.1007/BF00544481

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Keywords

  • Polymer
  • Orthophosphate
  • Spectroscopy
  • Raman Spectrum
  • Intensity Ratio