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FTIR spectra of βTCP and βMgTCP before (A, B) and after (C, D) immersion for 27 months. The Mg contents are 0 mol.% (a), 2.3 mol.% (b), 4.9 mol.% (c), 7.3 mol.% (d) and 10.1 mol.% (e). The arrows indicate bands characteristic of whitlockite.