Effect of SrO on the Structure of Apatite and Wollastonite Phases of Na<sub>2</sub>O-CaO-SiO<sub>2</sub>-P<sub>2</sub>O<sub>5</sub> Glass System — Oak Academic Publishing
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Effect of SrO on the Structure of Apatite and Wollastonite Phases of Na<sub>2</sub>O-CaO-SiO<sub>2</sub>-P<sub>2</sub>O<sub>5</sub> Glass System
Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
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Microwave Physics and Dielectrics Department, Physics Research Division, National Research Centre, Cairo, Egypt
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Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
1 Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
2 Microwave Physics and Dielectrics Department, Physics Research Division, National Research Centre, Cairo, Egypt
3 Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
Glasses in the system 24.5Na 2 O·24.5CaO·6P 2 O 5 ·xSrO·(45-x)SiO 2 have been studied in the composition region of x = 0 - 15 mol%. The as prepared glasses are transparent and have an amorphous network structure. On the otherhand, heat treated glasses are transformed to opaque white glass ceramic characterized by their highly crystalline network structure. Crystalline apatite (calcium phosphate, Ca 3 (PO 4 ) 2 , wollastonite (calcium silicate, CaSiO 3 ), and strontium calcium phosphate Ca 2 Sr(PO 4 ) 2 are the main well-formed crystalline species played the major role in material bioactivity. Increasing SrO leads to enhancing material crystallite and enhances the hardness of the host glass matrix. The change of XRD spectra, 31 P NMR chemical shift and hardness number upon increasing SrO are considered due to modification of the apatit Ca(PO 3 ) 2 to involve Sr ions inducing Ca 2 Sr (PO 4 ) 2 apatite one. Such species play the role in enhancing material properties and hardness.
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