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Isomorphous substitution of manganese for calcium in synthetic hydroxyapatite.

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Title: Isomorphous substitution of manganese for calcium in synthetic hydroxyapatite.
Authors: Bulina, Natalia V.1 (AUTHOR) bulina@solid.nsc.ru, Eremina, Natalya V.1 (AUTHOR), Mikhailenko, Mikhail A.1 (AUTHOR), Avakyan, Leon A.2 (AUTHOR), Paramonova, Ekaterina V.3 (AUTHOR), Vinokurova, Olga B.1 (AUTHOR), Makarova, Svetlana V.1 (AUTHOR), Prosanov, Igor Y.1 (AUTHOR), Bystrov, Vladimir S.3 (AUTHOR)
Source: Materials Chemistry & Physics. Sep2025, Vol. 342, pN.PAG-N.PAG. 1p.
Subjects: Bone substitutes, Thermal stability, Hydroxyapatite synthesis, Apatite, Ball mills
Abstract: Mn-substituted apatites have a broad application prospects in medicine as bone substitutes. Properties of such material largely depend on the state of manganese in the apatite structure. In this work, the mechanochemical method in a planetary ball mill is shown to be used for synthesis of Mn-substituted hydroxyapatite containing Mn2+ cations in the position of Ca2+. The maximum degree of isomorphic substitution for this synthesis method is x = 0.7. The resulting material possesses low thermal stability compared to unsubstituted hydroxyapatite due to the small ionic radius of the substituent. The decomposition temperature depends on the degree of substitution and occurs in the temperature range of 700–800 °C with the release of Mn 3 O 4 and β-phase of Ca 3–х Mn x (РО 4) 2. [Display omitted] • Mn-substituted hydroxyapatite was synthesized by a mechanochemical method. • Mn2+ cations replace Ca2+. • Violation of the symmetry of the OH-group environment was detected. • Material possesses low thermal stability. • Decomposition temperature depends on the degree of substitution. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Mn-substituted apatites have a broad application prospects in medicine as bone substitutes. Properties of such material largely depend on the state of manganese in the apatite structure. In this work, the mechanochemical method in a planetary ball mill is shown to be used for synthesis of Mn-substituted hydroxyapatite containing Mn2+ cations in the position of Ca2+. The maximum degree of isomorphic substitution for this synthesis method is x = 0.7. The resulting material possesses low thermal stability compared to unsubstituted hydroxyapatite due to the small ionic radius of the substituent. The decomposition temperature depends on the degree of substitution and occurs in the temperature range of 700–800 °C with the release of Mn 3 O 4 and β-phase of Ca 3–х Mn x (РО 4) 2. [Display omitted] • Mn-substituted hydroxyapatite was synthesized by a mechanochemical method. • Mn2+ cations replace Ca2+. • Violation of the symmetry of the OH-group environment was detected. • Material possesses low thermal stability. • Decomposition temperature depends on the degree of substitution. [ABSTRACT FROM AUTHOR]
ISSN:02540584
DOI:10.1016/j.matchemphys.2025.130957