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The theoretical ferroelectric polarization of the low-temperature (monoclinic, P 2 1 ) phase and the high-temperature (hexagonal, P 6 3 ) phase of hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 is calculated based on the density functional theory (DFT).
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Hu et al. (2017) studied this question.
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