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Three new chemical compositions based on the CaO-MgO-SiO(2) system were designed first, and then three novel glass-ceramics (M1, M2, and M3) were prepared by sol-gel method. X-ray diffraction analysis confirmed that they were predominantly composed of akermanite, wollastonite, and dicalcium silicate crystalline phases. The coefficient of thermal expansion (CTE) of M2 was 10.79 x 10(-6) degrees C(-1), closest to that of Ti-6Al-4V alloy, and the Young's modulus of M2 was 29.73 GPa, similar to that of the cortical bone. The bioactivity in vitro of M2 was evaluated by investigating its bonelike hydroxyapatite (HA)-formation ability in simulated body fluid (SBF), and the biocompatibility in vitro was detected by osteoblast proliferation, differentiation, and adhesion assay. The results revealed that M2 possessed bonelike carbonated hydroxyapatite (CHA)-formation ability in SBF and could significantly stimulate cell proliferation and differentiation. Furthermore, osteoblasts adhered and spread well on M2, indicating good bioactivity and biocompatibility in vitro.

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A series of Tb3+-doped Li2SrSiO4phosphors were prepared by high temperature solid state reaction. Effect of Tb3+-coped concentration on luminescence properties of Li2SrSiO4: Tb3+phosphor was investigated by XRD, FTIR, PL and CEI measurements. The results showed that the unit cell constant of Li2SrSiO4:Tb3+was reduced gradually with increasing Tb3+concentration, and then the FTIR absorption intensity assigned to the stretch vibration of [SiO4] and bend vibration of Si-O was decreased. The emission properties of Li2SrSiO4:Tb3+phosphors are strongly dependent on the concentration of Tb3+. The stronger blue and weaker green emission were shown as adding 1% Tb3+amount, while single bright green emission was presented in 20% Tb3+contents. The corresponding CIE was observed from (0.192, 0.315) to (0.246, 0.599). The results showed that the luminescence properties of Li2SrSiO4:Tb3+phosphor could meet various requirements by tuning the Tb3+-doped concentration.

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