The Influence of Cu²⁺ and Mn²⁺ Ions on the Structure and Crystallization of Diopside–Calcium Pyrophosphate Bioglasses

E-ISSN： 2041-1294|7|3|345-354

ISSN： 2041-1286

Source： INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE, Vol.7, Iss.3, 2016-09, pp. : 345-354

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The influence of two divalent cations, Cu²⁺ and Mn²⁺, on the structure, sintering, and crystallization of glasses and glass‐ceramics in the diopside–calcium pyrophosphate system (90 wt.% diopside (CaMgSi₂O₆), 10 wt.% calcium pyrophosphate (Ca₂P₂O₇)) was investigated. Glasses with 1, 3, and 5 wt% MnO or CuO additives were prepared by melt‐quenching and characterized by XRD, ²⁹Si and ³¹P NMR, DTA, and FTIR This revealed that the silicate network is predominantly coordinated in Q² (Si) units for all glasses, while phosphorus tends to inhabit an orthophosphate (Q⁰) environment. All glasses had a high rate of bioactivity after immersion in simulated body fluid. A slight depolymerization was observed in the doped glasses leading to lower T_g values in comparison with the parent glass. All glass‐ceramics exhibited the formation of diopside as the primary crystalline phase after sintering at 850°C/1 h. In comparison with the parent glass, the doped glasses featured significantly larger processing windows (∆T = T_c–T_g), ensuring good sinterability. Further, with increasing doping levels, the glasses exhibited a gradual decrease in T_p and ∆T, suggesting an increased tendency toward devitrification. All Cu‐ and Mn‐containing glasses exhibited the formation of hydroxyapatite, making them good candidates for biomedical applications and tissue engineering.