Polarized infrared reflectance spectra of brushite (CaHPO4⋅2H2O) crystal investigation of the phosphate stretching modes

• Polarized infrared reflectance measurements from the ac-plane of brushite crystal.
• Dispersion model analysis for monoclinic crystals.
• Oscillators parameters for the P–O stretching modes 800–1200 cm−1.

Polarized infrared (IR) reflectance measurements at near-normal incidence were recorded from the ac-plane of a monoclinic brushite (CaHPO4⋅2H2O) crystal in the 800–1200 cm−1 spectral range (P–O stretching modes). The adjustment of these data, on the basis of a dispersion analysis (DA) model for monoclinic case, allowed the determination of oscillators parameters for the four P–O stretching observed modes of the phosphate group.

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