Fig. 1

Characteristics of four types of calcium phosphate (Ca-P) bioceramics. A Photograph of typical Φ12 mm × 2 mm samples. B Photograph of typical Φ5 mm × 2 mm samples. C XRD results of four types of Ca-P bioceramics. D Typical scanning electron microscope (SEM) photographs of four types of Ca-P bioceramics at 50 × (scale bar = 1 mm) and 10,000 × (scale bar = 5 μm)