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Scanning electron microscopy images of (A–C) the sample synthesized by using CaCl2 and NaH2PO4 without the addition of C4H4O6 KNa · 4H2O at 200°C for 24 hours (sample 7); (D–F) the sample synthesized by using CaCl2 and C4H4O6 KNa · 4H2O at room temperature for 30 minutes (sample 8); and (G–I) the sample synthesized by using CaCl2 and C4H4O6 KNa · 4H2O at 200°C for 24 hours (sample 9).
